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https://github.com/facebook/rocksdb.git
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7743f033b1
Summary: Potential bugs in the IO uring implementation can cause bad data to be returned in the completion queue. Add some checks in the PosixRandomAccessFile::MultiRead completion handling code to catch such errors and fail the entire MultiRead. Also log some diagnostic messages and stack trace. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8894 Reviewed By: siying, pdillinger Differential Revision: D30826982 Pulled By: anand1976 fbshipit-source-id: af91815ac760e095d6cc0466cf8bd5c10167fd15
3599 lines
139 KiB
C++
3599 lines
139 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "table/block_based/block_based_table_reader.h"
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#include <algorithm>
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#include <array>
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#include <limits>
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#include <string>
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#include <utility>
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#include <vector>
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#include "cache/cache_entry_roles.h"
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#include "cache/sharded_cache.h"
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#include "db/dbformat.h"
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#include "db/pinned_iterators_manager.h"
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#include "file/file_prefetch_buffer.h"
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#include "file/file_util.h"
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#include "file/random_access_file_reader.h"
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#include "monitoring/perf_context_imp.h"
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#include "options/options_helper.h"
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#include "port/lang.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/comparator.h"
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#include "rocksdb/env.h"
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#include "rocksdb/file_system.h"
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#include "rocksdb/filter_policy.h"
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#include "rocksdb/iterator.h"
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#include "rocksdb/options.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/system_clock.h"
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#include "rocksdb/table.h"
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#include "rocksdb/table_properties.h"
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#include "rocksdb/trace_record.h"
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#include "table/block_based/binary_search_index_reader.h"
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#include "table/block_based/block.h"
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#include "table/block_based/block_based_filter_block.h"
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#include "table/block_based/block_based_table_factory.h"
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#include "table/block_based/block_based_table_iterator.h"
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#include "table/block_based/block_like_traits.h"
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#include "table/block_based/block_prefix_index.h"
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#include "table/block_based/block_type.h"
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#include "table/block_based/filter_block.h"
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#include "table/block_based/full_filter_block.h"
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#include "table/block_based/hash_index_reader.h"
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#include "table/block_based/partitioned_filter_block.h"
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#include "table/block_based/partitioned_index_reader.h"
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#include "table/block_fetcher.h"
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#include "table/format.h"
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#include "table/get_context.h"
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#include "table/internal_iterator.h"
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#include "table/meta_blocks.h"
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#include "table/multiget_context.h"
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#include "table/persistent_cache_helper.h"
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#include "table/persistent_cache_options.h"
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#include "table/sst_file_writer_collectors.h"
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#include "table/two_level_iterator.h"
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#include "test_util/sync_point.h"
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#include "util/coding.h"
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#include "util/crc32c.h"
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#include "util/stop_watch.h"
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#include "util/string_util.h"
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namespace ROCKSDB_NAMESPACE {
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extern const uint64_t kBlockBasedTableMagicNumber;
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extern const std::string kHashIndexPrefixesBlock;
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extern const std::string kHashIndexPrefixesMetadataBlock;
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BlockBasedTable::~BlockBasedTable() {
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delete rep_;
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}
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std::atomic<uint64_t> BlockBasedTable::next_cache_key_id_(0);
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namespace {
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// Read the block identified by "handle" from "file".
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// The only relevant option is options.verify_checksums for now.
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// On failure return non-OK.
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// On success fill *result and return OK - caller owns *result
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// @param uncompression_dict Data for presetting the compression library's
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// dictionary.
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template <typename TBlocklike>
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Status ReadBlockFromFile(
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RandomAccessFileReader* file, FilePrefetchBuffer* prefetch_buffer,
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const Footer& footer, const ReadOptions& options, const BlockHandle& handle,
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std::unique_ptr<TBlocklike>* result, const ImmutableOptions& ioptions,
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bool do_uncompress, bool maybe_compressed, BlockType block_type,
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const UncompressionDict& uncompression_dict,
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const PersistentCacheOptions& cache_options, size_t read_amp_bytes_per_bit,
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MemoryAllocator* memory_allocator, bool for_compaction, bool using_zstd,
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const FilterPolicy* filter_policy) {
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assert(result);
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BlockContents contents;
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BlockFetcher block_fetcher(
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file, prefetch_buffer, footer, options, handle, &contents, ioptions,
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do_uncompress, maybe_compressed, block_type, uncompression_dict,
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cache_options, memory_allocator, nullptr, for_compaction);
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Status s = block_fetcher.ReadBlockContents();
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if (s.ok()) {
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result->reset(BlocklikeTraits<TBlocklike>::Create(
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std::move(contents), read_amp_bytes_per_bit, ioptions.stats, using_zstd,
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filter_policy));
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}
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return s;
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}
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// Release the cached entry and decrement its ref count.
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// Do not force erase
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void ReleaseCachedEntry(void* arg, void* h) {
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Cache* cache = reinterpret_cast<Cache*>(arg);
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Cache::Handle* handle = reinterpret_cast<Cache::Handle*>(h);
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cache->Release(handle, false /* force_erase */);
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}
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// For hash based index, return true if prefix_extractor and
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// prefix_extractor_block mismatch, false otherwise. This flag will be used
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// as total_order_seek via NewIndexIterator
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bool PrefixExtractorChanged(const TableProperties* table_properties,
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const SliceTransform* prefix_extractor) {
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// BlockBasedTableOptions::kHashSearch requires prefix_extractor to be set.
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// Turn off hash index in prefix_extractor is not set; if prefix_extractor
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// is set but prefix_extractor_block is not set, also disable hash index
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if (prefix_extractor == nullptr || table_properties == nullptr ||
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table_properties->prefix_extractor_name.empty()) {
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return true;
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}
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// prefix_extractor and prefix_extractor_block are both non-empty
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if (table_properties->prefix_extractor_name.compare(
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prefix_extractor->Name()) != 0) {
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return true;
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} else {
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return false;
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}
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}
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CacheAllocationPtr CopyBufferToHeap(MemoryAllocator* allocator, Slice& buf) {
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CacheAllocationPtr heap_buf;
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heap_buf = AllocateBlock(buf.size(), allocator);
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memcpy(heap_buf.get(), buf.data(), buf.size());
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return heap_buf;
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}
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} // namespace
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void BlockBasedTable::UpdateCacheHitMetrics(BlockType block_type,
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GetContext* get_context,
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size_t usage) const {
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Statistics* const statistics = rep_->ioptions.stats;
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PERF_COUNTER_ADD(block_cache_hit_count, 1);
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PERF_COUNTER_BY_LEVEL_ADD(block_cache_hit_count, 1,
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static_cast<uint32_t>(rep_->level));
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if (get_context) {
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++get_context->get_context_stats_.num_cache_hit;
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get_context->get_context_stats_.num_cache_bytes_read += usage;
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} else {
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RecordTick(statistics, BLOCK_CACHE_HIT);
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RecordTick(statistics, BLOCK_CACHE_BYTES_READ, usage);
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}
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switch (block_type) {
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case BlockType::kFilter:
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PERF_COUNTER_ADD(block_cache_filter_hit_count, 1);
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if (get_context) {
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++get_context->get_context_stats_.num_cache_filter_hit;
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} else {
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RecordTick(statistics, BLOCK_CACHE_FILTER_HIT);
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}
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break;
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case BlockType::kCompressionDictionary:
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// TODO: introduce perf counter for compression dictionary hit count
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if (get_context) {
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++get_context->get_context_stats_.num_cache_compression_dict_hit;
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} else {
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RecordTick(statistics, BLOCK_CACHE_COMPRESSION_DICT_HIT);
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}
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break;
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case BlockType::kIndex:
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PERF_COUNTER_ADD(block_cache_index_hit_count, 1);
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if (get_context) {
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++get_context->get_context_stats_.num_cache_index_hit;
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} else {
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RecordTick(statistics, BLOCK_CACHE_INDEX_HIT);
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}
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break;
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default:
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// TODO: introduce dedicated tickers/statistics/counters
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// for range tombstones
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if (get_context) {
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++get_context->get_context_stats_.num_cache_data_hit;
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} else {
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RecordTick(statistics, BLOCK_CACHE_DATA_HIT);
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}
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break;
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}
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}
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void BlockBasedTable::UpdateCacheMissMetrics(BlockType block_type,
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GetContext* get_context) const {
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Statistics* const statistics = rep_->ioptions.stats;
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// TODO: introduce aggregate (not per-level) block cache miss count
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PERF_COUNTER_BY_LEVEL_ADD(block_cache_miss_count, 1,
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static_cast<uint32_t>(rep_->level));
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if (get_context) {
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++get_context->get_context_stats_.num_cache_miss;
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} else {
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RecordTick(statistics, BLOCK_CACHE_MISS);
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}
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// TODO: introduce perf counters for misses per block type
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switch (block_type) {
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case BlockType::kFilter:
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if (get_context) {
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++get_context->get_context_stats_.num_cache_filter_miss;
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} else {
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RecordTick(statistics, BLOCK_CACHE_FILTER_MISS);
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}
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break;
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case BlockType::kCompressionDictionary:
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if (get_context) {
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++get_context->get_context_stats_.num_cache_compression_dict_miss;
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} else {
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RecordTick(statistics, BLOCK_CACHE_COMPRESSION_DICT_MISS);
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}
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break;
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case BlockType::kIndex:
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if (get_context) {
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++get_context->get_context_stats_.num_cache_index_miss;
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} else {
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RecordTick(statistics, BLOCK_CACHE_INDEX_MISS);
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}
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break;
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default:
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// TODO: introduce dedicated tickers/statistics/counters
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// for range tombstones
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if (get_context) {
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++get_context->get_context_stats_.num_cache_data_miss;
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} else {
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RecordTick(statistics, BLOCK_CACHE_DATA_MISS);
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}
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break;
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}
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}
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void BlockBasedTable::UpdateCacheInsertionMetrics(
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BlockType block_type, GetContext* get_context, size_t usage, bool redundant,
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Statistics* const statistics) {
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// TODO: introduce perf counters for block cache insertions
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if (get_context) {
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++get_context->get_context_stats_.num_cache_add;
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if (redundant) {
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++get_context->get_context_stats_.num_cache_add_redundant;
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}
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get_context->get_context_stats_.num_cache_bytes_write += usage;
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} else {
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RecordTick(statistics, BLOCK_CACHE_ADD);
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if (redundant) {
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RecordTick(statistics, BLOCK_CACHE_ADD_REDUNDANT);
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}
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RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, usage);
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}
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switch (block_type) {
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case BlockType::kFilter:
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if (get_context) {
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++get_context->get_context_stats_.num_cache_filter_add;
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if (redundant) {
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++get_context->get_context_stats_.num_cache_filter_add_redundant;
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}
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get_context->get_context_stats_.num_cache_filter_bytes_insert += usage;
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} else {
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RecordTick(statistics, BLOCK_CACHE_FILTER_ADD);
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if (redundant) {
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RecordTick(statistics, BLOCK_CACHE_FILTER_ADD_REDUNDANT);
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}
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RecordTick(statistics, BLOCK_CACHE_FILTER_BYTES_INSERT, usage);
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}
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break;
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case BlockType::kCompressionDictionary:
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if (get_context) {
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++get_context->get_context_stats_.num_cache_compression_dict_add;
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if (redundant) {
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++get_context->get_context_stats_
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.num_cache_compression_dict_add_redundant;
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}
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get_context->get_context_stats_
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.num_cache_compression_dict_bytes_insert += usage;
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} else {
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RecordTick(statistics, BLOCK_CACHE_COMPRESSION_DICT_ADD);
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if (redundant) {
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RecordTick(statistics, BLOCK_CACHE_COMPRESSION_DICT_ADD_REDUNDANT);
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}
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RecordTick(statistics, BLOCK_CACHE_COMPRESSION_DICT_BYTES_INSERT,
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usage);
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}
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break;
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case BlockType::kIndex:
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if (get_context) {
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++get_context->get_context_stats_.num_cache_index_add;
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if (redundant) {
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++get_context->get_context_stats_.num_cache_index_add_redundant;
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}
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get_context->get_context_stats_.num_cache_index_bytes_insert += usage;
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} else {
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RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
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if (redundant) {
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RecordTick(statistics, BLOCK_CACHE_INDEX_ADD_REDUNDANT);
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}
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RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT, usage);
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}
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break;
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default:
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// TODO: introduce dedicated tickers/statistics/counters
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// for range tombstones
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if (get_context) {
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++get_context->get_context_stats_.num_cache_data_add;
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if (redundant) {
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++get_context->get_context_stats_.num_cache_data_add_redundant;
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}
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get_context->get_context_stats_.num_cache_data_bytes_insert += usage;
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} else {
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RecordTick(statistics, BLOCK_CACHE_DATA_ADD);
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if (redundant) {
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RecordTick(statistics, BLOCK_CACHE_DATA_ADD_REDUNDANT);
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}
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RecordTick(statistics, BLOCK_CACHE_DATA_BYTES_INSERT, usage);
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}
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break;
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}
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}
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Cache::Handle* BlockBasedTable::GetEntryFromCache(
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Cache* block_cache, const Slice& key, BlockType block_type, const bool wait,
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GetContext* get_context, const Cache::CacheItemHelper* cache_helper,
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const Cache::CreateCallback& create_cb, Cache::Priority priority) const {
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auto cache_handle =
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block_cache->Lookup(key, cache_helper, create_cb, priority, wait,
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rep_->ioptions.statistics.get());
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if (cache_handle != nullptr) {
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UpdateCacheHitMetrics(block_type, get_context,
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block_cache->GetUsage(cache_handle));
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} else {
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UpdateCacheMissMetrics(block_type, get_context);
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}
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return cache_handle;
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}
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// Helper function to setup the cache key's prefix for the Table.
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void BlockBasedTable::SetupCacheKeyPrefix(Rep* rep,
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const std::string& db_session_id,
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uint64_t file_num) {
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assert(kMaxCacheKeyPrefixSize >= 10);
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rep->cache_key_prefix_size = 0;
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rep->compressed_cache_key_prefix_size = 0;
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if (rep->table_options.block_cache != nullptr) {
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GenerateCachePrefix<Cache, FSRandomAccessFile>(
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rep->table_options.block_cache.get(), rep->file->file(),
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&rep->cache_key_prefix[0], &rep->cache_key_prefix_size, db_session_id,
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file_num);
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}
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if (rep->table_options.block_cache_compressed != nullptr) {
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GenerateCachePrefix<Cache, FSRandomAccessFile>(
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rep->table_options.block_cache_compressed.get(), rep->file->file(),
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&rep->compressed_cache_key_prefix[0],
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&rep->compressed_cache_key_prefix_size, db_session_id, file_num);
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}
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if (rep->table_options.persistent_cache != nullptr) {
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char persistent_cache_key_prefix[kMaxCacheKeyPrefixSize];
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size_t persistent_cache_key_prefix_size = 0;
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GenerateCachePrefix<PersistentCache, FSRandomAccessFile>(
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rep->table_options.persistent_cache.get(), rep->file->file(),
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&persistent_cache_key_prefix[0], &persistent_cache_key_prefix_size,
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db_session_id, file_num);
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rep->persistent_cache_options =
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PersistentCacheOptions(rep->table_options.persistent_cache,
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std::string(persistent_cache_key_prefix,
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persistent_cache_key_prefix_size),
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rep->ioptions.stats);
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}
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}
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namespace {
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// Return True if table_properties has `user_prop_name` has a `true` value
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// or it doesn't contain this property (for backward compatible).
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bool IsFeatureSupported(const TableProperties& table_properties,
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const std::string& user_prop_name, Logger* info_log) {
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auto& props = table_properties.user_collected_properties;
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auto pos = props.find(user_prop_name);
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// Older version doesn't have this value set. Skip this check.
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if (pos != props.end()) {
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if (pos->second == kPropFalse) {
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return false;
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} else if (pos->second != kPropTrue) {
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ROCKS_LOG_WARN(info_log, "Property %s has invalidate value %s",
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user_prop_name.c_str(), pos->second.c_str());
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}
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}
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return true;
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}
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// Caller has to ensure seqno is not nullptr.
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Status GetGlobalSequenceNumber(const TableProperties& table_properties,
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SequenceNumber largest_seqno,
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SequenceNumber* seqno) {
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const auto& props = table_properties.user_collected_properties;
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const auto version_pos = props.find(ExternalSstFilePropertyNames::kVersion);
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const auto seqno_pos = props.find(ExternalSstFilePropertyNames::kGlobalSeqno);
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*seqno = kDisableGlobalSequenceNumber;
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if (version_pos == props.end()) {
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if (seqno_pos != props.end()) {
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std::array<char, 200> msg_buf;
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// This is not an external sst file, global_seqno is not supported.
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snprintf(
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msg_buf.data(), msg_buf.max_size(),
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"A non-external sst file have global seqno property with value %s",
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seqno_pos->second.c_str());
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return Status::Corruption(msg_buf.data());
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}
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return Status::OK();
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}
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uint32_t version = DecodeFixed32(version_pos->second.c_str());
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if (version < 2) {
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if (seqno_pos != props.end() || version != 1) {
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std::array<char, 200> msg_buf;
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// This is a v1 external sst file, global_seqno is not supported.
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snprintf(msg_buf.data(), msg_buf.max_size(),
|
|
"An external sst file with version %u have global seqno "
|
|
"property with value %s",
|
|
version, seqno_pos->second.c_str());
|
|
return Status::Corruption(msg_buf.data());
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
// Since we have a plan to deprecate global_seqno, we do not return failure
|
|
// if seqno_pos == props.end(). We rely on version_pos to detect whether the
|
|
// SST is external.
|
|
SequenceNumber global_seqno(0);
|
|
if (seqno_pos != props.end()) {
|
|
global_seqno = DecodeFixed64(seqno_pos->second.c_str());
|
|
}
|
|
// SstTableReader open table reader with kMaxSequenceNumber as largest_seqno
|
|
// to denote it is unknown.
|
|
if (largest_seqno < kMaxSequenceNumber) {
|
|
if (global_seqno == 0) {
|
|
global_seqno = largest_seqno;
|
|
}
|
|
if (global_seqno != largest_seqno) {
|
|
std::array<char, 200> msg_buf;
|
|
snprintf(
|
|
msg_buf.data(), msg_buf.max_size(),
|
|
"An external sst file with version %u have global seqno property "
|
|
"with value %s, while largest seqno in the file is %llu",
|
|
version, seqno_pos->second.c_str(),
|
|
static_cast<unsigned long long>(largest_seqno));
|
|
return Status::Corruption(msg_buf.data());
|
|
}
|
|
}
|
|
*seqno = global_seqno;
|
|
|
|
if (global_seqno > kMaxSequenceNumber) {
|
|
std::array<char, 200> msg_buf;
|
|
snprintf(msg_buf.data(), msg_buf.max_size(),
|
|
"An external sst file with version %u have global seqno property "
|
|
"with value %llu, which is greater than kMaxSequenceNumber",
|
|
version, static_cast<unsigned long long>(global_seqno));
|
|
return Status::Corruption(msg_buf.data());
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
} // namespace
|
|
|
|
Slice BlockBasedTable::GetCacheKey(const char* cache_key_prefix,
|
|
size_t cache_key_prefix_size,
|
|
const BlockHandle& handle, char* cache_key) {
|
|
assert(cache_key != nullptr);
|
|
assert(cache_key_prefix_size != 0);
|
|
assert(cache_key_prefix_size <= kMaxCacheKeyPrefixSize);
|
|
memcpy(cache_key, cache_key_prefix, cache_key_prefix_size);
|
|
char* end =
|
|
EncodeVarint64(cache_key + cache_key_prefix_size, handle.offset());
|
|
return Slice(cache_key, static_cast<size_t>(end - cache_key));
|
|
}
|
|
|
|
Status BlockBasedTable::Open(
|
|
const ReadOptions& read_options, const ImmutableOptions& ioptions,
|
|
const EnvOptions& env_options, const BlockBasedTableOptions& table_options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
std::unique_ptr<RandomAccessFileReader>&& file, uint64_t file_size,
|
|
std::unique_ptr<TableReader>* table_reader,
|
|
const SliceTransform* prefix_extractor,
|
|
const bool prefetch_index_and_filter_in_cache, const bool skip_filters,
|
|
const int level, const bool immortal_table,
|
|
const SequenceNumber largest_seqno, const bool force_direct_prefetch,
|
|
TailPrefetchStats* tail_prefetch_stats,
|
|
BlockCacheTracer* const block_cache_tracer,
|
|
size_t max_file_size_for_l0_meta_pin, const std::string& cur_db_session_id,
|
|
uint64_t cur_file_num) {
|
|
table_reader->reset();
|
|
|
|
Status s;
|
|
Footer footer;
|
|
std::unique_ptr<FilePrefetchBuffer> prefetch_buffer;
|
|
|
|
// Only retain read_options.deadline and read_options.io_timeout.
|
|
// In future, we may retain more
|
|
// options. Specifically, w ignore verify_checksums and default to
|
|
// checksum verification anyway when creating the index and filter
|
|
// readers.
|
|
ReadOptions ro;
|
|
ro.deadline = read_options.deadline;
|
|
ro.io_timeout = read_options.io_timeout;
|
|
|
|
// prefetch both index and filters, down to all partitions
|
|
const bool prefetch_all = prefetch_index_and_filter_in_cache || level == 0;
|
|
const bool preload_all = !table_options.cache_index_and_filter_blocks;
|
|
|
|
if (!ioptions.allow_mmap_reads) {
|
|
s = PrefetchTail(ro, file.get(), file_size, force_direct_prefetch,
|
|
tail_prefetch_stats, prefetch_all, preload_all,
|
|
&prefetch_buffer);
|
|
// Return error in prefetch path to users.
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
} else {
|
|
// Should not prefetch for mmap mode.
|
|
prefetch_buffer.reset(new FilePrefetchBuffer(
|
|
nullptr, 0, 0, false /* enable */, true /* track_min_offset */));
|
|
}
|
|
|
|
// Read in the following order:
|
|
// 1. Footer
|
|
// 2. [metaindex block]
|
|
// 3. [meta block: properties]
|
|
// 4. [meta block: range deletion tombstone]
|
|
// 5. [meta block: compression dictionary]
|
|
// 6. [meta block: index]
|
|
// 7. [meta block: filter]
|
|
IOOptions opts;
|
|
s = file->PrepareIOOptions(ro, opts);
|
|
if (s.ok()) {
|
|
s = ReadFooterFromFile(opts, file.get(), prefetch_buffer.get(), file_size,
|
|
&footer, kBlockBasedTableMagicNumber);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (!BlockBasedTableSupportedVersion(footer.version())) {
|
|
return Status::Corruption(
|
|
"Unknown Footer version. Maybe this file was created with newer "
|
|
"version of RocksDB?");
|
|
}
|
|
|
|
// We've successfully read the footer. We are ready to serve requests.
|
|
// Better not mutate rep_ after the creation. eg. internal_prefix_transform
|
|
// raw pointer will be used to create HashIndexReader, whose reset may
|
|
// access a dangling pointer.
|
|
BlockCacheLookupContext lookup_context{TableReaderCaller::kPrefetch};
|
|
Rep* rep = new BlockBasedTable::Rep(ioptions, env_options, table_options,
|
|
internal_comparator, skip_filters,
|
|
file_size, level, immortal_table);
|
|
rep->file = std::move(file);
|
|
rep->footer = footer;
|
|
rep->hash_index_allow_collision = table_options.hash_index_allow_collision;
|
|
// We need to wrap data with internal_prefix_transform to make sure it can
|
|
// handle prefix correctly.
|
|
if (prefix_extractor != nullptr) {
|
|
rep->internal_prefix_transform.reset(
|
|
new InternalKeySliceTransform(prefix_extractor));
|
|
}
|
|
|
|
// For fully portable/stable cache keys, we need to read the properties
|
|
// block before setting up cache keys. TODO: consider setting up a bootstrap
|
|
// cache key for PersistentCache to use for metaindex and properties blocks.
|
|
rep->persistent_cache_options = PersistentCacheOptions();
|
|
|
|
// Meta-blocks are not dictionary compressed. Explicitly set the dictionary
|
|
// handle to null, otherwise it may be seen as uninitialized during the below
|
|
// meta-block reads.
|
|
rep->compression_dict_handle = BlockHandle::NullBlockHandle();
|
|
|
|
// Read metaindex
|
|
std::unique_ptr<BlockBasedTable> new_table(
|
|
new BlockBasedTable(rep, block_cache_tracer));
|
|
std::unique_ptr<Block> metaindex;
|
|
std::unique_ptr<InternalIterator> metaindex_iter;
|
|
s = new_table->ReadMetaIndexBlock(ro, prefetch_buffer.get(), &metaindex,
|
|
&metaindex_iter);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// Populates table_properties and some fields that depend on it,
|
|
// such as index_type.
|
|
s = new_table->ReadPropertiesBlock(ro, prefetch_buffer.get(),
|
|
metaindex_iter.get(), largest_seqno);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// With properties loaded, we can set up portable/stable cache keys if
|
|
// necessary info is available
|
|
std::string db_session_id;
|
|
uint64_t file_num;
|
|
if (rep->table_properties && !rep->table_properties->db_session_id.empty() &&
|
|
rep->table_properties->orig_file_number > 0) {
|
|
// We must have both properties to get a stable unique id because
|
|
// CreateColumnFamilyWithImport or IngestExternalFiles can change the
|
|
// file numbers on a file.
|
|
db_session_id = rep->table_properties->db_session_id;
|
|
file_num = rep->table_properties->orig_file_number;
|
|
} else {
|
|
// We have to use transient (but unique) cache keys based on current
|
|
// identifiers.
|
|
db_session_id = cur_db_session_id;
|
|
file_num = cur_file_num;
|
|
}
|
|
SetupCacheKeyPrefix(rep, db_session_id, file_num);
|
|
|
|
s = new_table->ReadRangeDelBlock(ro, prefetch_buffer.get(),
|
|
metaindex_iter.get(), internal_comparator,
|
|
&lookup_context);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
s = new_table->PrefetchIndexAndFilterBlocks(
|
|
ro, prefetch_buffer.get(), metaindex_iter.get(), new_table.get(),
|
|
prefetch_all, table_options, level, file_size,
|
|
max_file_size_for_l0_meta_pin, &lookup_context);
|
|
|
|
if (s.ok()) {
|
|
// Update tail prefetch stats
|
|
assert(prefetch_buffer.get() != nullptr);
|
|
if (tail_prefetch_stats != nullptr) {
|
|
assert(prefetch_buffer->min_offset_read() < file_size);
|
|
tail_prefetch_stats->RecordEffectiveSize(
|
|
static_cast<size_t>(file_size) - prefetch_buffer->min_offset_read());
|
|
}
|
|
|
|
*table_reader = std::move(new_table);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::PrefetchTail(
|
|
const ReadOptions& ro, RandomAccessFileReader* file, uint64_t file_size,
|
|
bool force_direct_prefetch, TailPrefetchStats* tail_prefetch_stats,
|
|
const bool prefetch_all, const bool preload_all,
|
|
std::unique_ptr<FilePrefetchBuffer>* prefetch_buffer) {
|
|
size_t tail_prefetch_size = 0;
|
|
if (tail_prefetch_stats != nullptr) {
|
|
// Multiple threads may get a 0 (no history) when running in parallel,
|
|
// but it will get cleared after the first of them finishes.
|
|
tail_prefetch_size = tail_prefetch_stats->GetSuggestedPrefetchSize();
|
|
}
|
|
if (tail_prefetch_size == 0) {
|
|
// Before read footer, readahead backwards to prefetch data. Do more
|
|
// readahead if we're going to read index/filter.
|
|
// TODO: This may incorrectly select small readahead in case partitioned
|
|
// index/filter is enabled and top-level partition pinning is enabled.
|
|
// That's because we need to issue readahead before we read the properties,
|
|
// at which point we don't yet know the index type.
|
|
tail_prefetch_size = prefetch_all || preload_all ? 512 * 1024 : 4 * 1024;
|
|
}
|
|
size_t prefetch_off;
|
|
size_t prefetch_len;
|
|
if (file_size < tail_prefetch_size) {
|
|
prefetch_off = 0;
|
|
prefetch_len = static_cast<size_t>(file_size);
|
|
} else {
|
|
prefetch_off = static_cast<size_t>(file_size - tail_prefetch_size);
|
|
prefetch_len = tail_prefetch_size;
|
|
}
|
|
TEST_SYNC_POINT_CALLBACK("BlockBasedTable::Open::TailPrefetchLen",
|
|
&tail_prefetch_size);
|
|
|
|
// Try file system prefetch
|
|
if (!file->use_direct_io() && !force_direct_prefetch) {
|
|
if (!file->Prefetch(prefetch_off, prefetch_len).IsNotSupported()) {
|
|
prefetch_buffer->reset(
|
|
new FilePrefetchBuffer(nullptr, 0, 0, false, true));
|
|
return Status::OK();
|
|
}
|
|
}
|
|
|
|
// Use `FilePrefetchBuffer`
|
|
prefetch_buffer->reset(new FilePrefetchBuffer(nullptr, 0, 0, true, true));
|
|
IOOptions opts;
|
|
Status s = file->PrepareIOOptions(ro, opts);
|
|
if (s.ok()) {
|
|
s = (*prefetch_buffer)->Prefetch(opts, file, prefetch_off, prefetch_len);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::TryReadPropertiesWithGlobalSeqno(
|
|
const ReadOptions& ro, FilePrefetchBuffer* prefetch_buffer,
|
|
const Slice& handle_value, TableProperties** table_properties) {
|
|
assert(table_properties != nullptr);
|
|
// If this is an external SST file ingested with write_global_seqno set to
|
|
// true, then we expect the checksum mismatch because checksum was written
|
|
// by SstFileWriter, but its global seqno in the properties block may have
|
|
// been changed during ingestion. In this case, we read the properties
|
|
// block, copy it to a memory buffer, change the global seqno to its
|
|
// original value, i.e. 0, and verify the checksum again.
|
|
BlockHandle props_block_handle;
|
|
CacheAllocationPtr tmp_buf;
|
|
Status s = ReadProperties(ro, handle_value, rep_->file.get(), prefetch_buffer,
|
|
rep_->footer, rep_->ioptions, table_properties,
|
|
false /* verify_checksum */, &props_block_handle,
|
|
&tmp_buf, false /* compression_type_missing */,
|
|
nullptr /* memory_allocator */);
|
|
if (s.ok() && tmp_buf) {
|
|
const auto seqno_pos_iter =
|
|
(*table_properties)
|
|
->properties_offsets.find(
|
|
ExternalSstFilePropertyNames::kGlobalSeqno);
|
|
size_t block_size = static_cast<size_t>(props_block_handle.size());
|
|
if (seqno_pos_iter != (*table_properties)->properties_offsets.end()) {
|
|
uint64_t global_seqno_offset = seqno_pos_iter->second;
|
|
EncodeFixed64(
|
|
tmp_buf.get() + global_seqno_offset - props_block_handle.offset(), 0);
|
|
}
|
|
s = ROCKSDB_NAMESPACE::VerifyBlockChecksum(
|
|
rep_->footer.checksum(), tmp_buf.get(), block_size,
|
|
rep_->file->file_name(), props_block_handle.offset());
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::ReadPropertiesBlock(
|
|
const ReadOptions& ro, FilePrefetchBuffer* prefetch_buffer,
|
|
InternalIterator* meta_iter, const SequenceNumber largest_seqno) {
|
|
bool found_properties_block = true;
|
|
Status s;
|
|
s = SeekToPropertiesBlock(meta_iter, &found_properties_block);
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(rep_->ioptions.logger,
|
|
"Error when seeking to properties block from file: %s",
|
|
s.ToString().c_str());
|
|
} else if (found_properties_block) {
|
|
s = meta_iter->status();
|
|
TableProperties* table_properties = nullptr;
|
|
if (s.ok()) {
|
|
s = ReadProperties(
|
|
ro, meta_iter->value(), rep_->file.get(), prefetch_buffer,
|
|
rep_->footer, rep_->ioptions, &table_properties,
|
|
true /* verify_checksum */, nullptr /* ret_block_handle */,
|
|
nullptr /* ret_block_contents */,
|
|
false /* compression_type_missing */, nullptr /* memory_allocator */);
|
|
}
|
|
IGNORE_STATUS_IF_ERROR(s);
|
|
|
|
if (s.IsCorruption()) {
|
|
s = TryReadPropertiesWithGlobalSeqno(
|
|
ro, prefetch_buffer, meta_iter->value(), &table_properties);
|
|
IGNORE_STATUS_IF_ERROR(s);
|
|
}
|
|
std::unique_ptr<TableProperties> props_guard;
|
|
if (table_properties != nullptr) {
|
|
props_guard.reset(table_properties);
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(rep_->ioptions.logger,
|
|
"Encountered error while reading data from properties "
|
|
"block %s",
|
|
s.ToString().c_str());
|
|
} else {
|
|
assert(table_properties != nullptr);
|
|
rep_->table_properties.reset(props_guard.release());
|
|
rep_->blocks_maybe_compressed =
|
|
rep_->table_properties->compression_name !=
|
|
CompressionTypeToString(kNoCompression);
|
|
rep_->blocks_definitely_zstd_compressed =
|
|
(rep_->table_properties->compression_name ==
|
|
CompressionTypeToString(kZSTD) ||
|
|
rep_->table_properties->compression_name ==
|
|
CompressionTypeToString(kZSTDNotFinalCompression));
|
|
}
|
|
} else {
|
|
ROCKS_LOG_ERROR(rep_->ioptions.logger,
|
|
"Cannot find Properties block from file.");
|
|
}
|
|
#ifndef ROCKSDB_LITE
|
|
if (rep_->table_properties) {
|
|
ParseSliceTransform(rep_->table_properties->prefix_extractor_name,
|
|
&(rep_->table_prefix_extractor));
|
|
}
|
|
#endif // ROCKSDB_LITE
|
|
|
|
// Read the table properties, if provided.
|
|
if (rep_->table_properties) {
|
|
rep_->whole_key_filtering &=
|
|
IsFeatureSupported(*(rep_->table_properties),
|
|
BlockBasedTablePropertyNames::kWholeKeyFiltering,
|
|
rep_->ioptions.logger);
|
|
rep_->prefix_filtering &= IsFeatureSupported(
|
|
*(rep_->table_properties),
|
|
BlockBasedTablePropertyNames::kPrefixFiltering, rep_->ioptions.logger);
|
|
|
|
rep_->index_key_includes_seq =
|
|
rep_->table_properties->index_key_is_user_key == 0;
|
|
rep_->index_value_is_full =
|
|
rep_->table_properties->index_value_is_delta_encoded == 0;
|
|
|
|
// Update index_type with the true type.
|
|
// If table properties don't contain index type, we assume that the table
|
|
// is in very old format and has kBinarySearch index type.
|
|
auto& props = rep_->table_properties->user_collected_properties;
|
|
auto pos = props.find(BlockBasedTablePropertyNames::kIndexType);
|
|
if (pos != props.end()) {
|
|
rep_->index_type = static_cast<BlockBasedTableOptions::IndexType>(
|
|
DecodeFixed32(pos->second.c_str()));
|
|
}
|
|
|
|
rep_->index_has_first_key =
|
|
rep_->index_type == BlockBasedTableOptions::kBinarySearchWithFirstKey;
|
|
|
|
s = GetGlobalSequenceNumber(*(rep_->table_properties), largest_seqno,
|
|
&(rep_->global_seqno));
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_ERROR(rep_->ioptions.logger, "%s", s.ToString().c_str());
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::ReadRangeDelBlock(
|
|
const ReadOptions& read_options, FilePrefetchBuffer* prefetch_buffer,
|
|
InternalIterator* meta_iter,
|
|
const InternalKeyComparator& internal_comparator,
|
|
BlockCacheLookupContext* lookup_context) {
|
|
Status s;
|
|
bool found_range_del_block;
|
|
BlockHandle range_del_handle;
|
|
s = SeekToRangeDelBlock(meta_iter, &found_range_del_block, &range_del_handle);
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
rep_->ioptions.logger,
|
|
"Error when seeking to range delete tombstones block from file: %s",
|
|
s.ToString().c_str());
|
|
} else if (found_range_del_block && !range_del_handle.IsNull()) {
|
|
std::unique_ptr<InternalIterator> iter(NewDataBlockIterator<DataBlockIter>(
|
|
read_options, range_del_handle,
|
|
/*input_iter=*/nullptr, BlockType::kRangeDeletion,
|
|
/*get_context=*/nullptr, lookup_context, Status(), prefetch_buffer));
|
|
assert(iter != nullptr);
|
|
s = iter->status();
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
rep_->ioptions.logger,
|
|
"Encountered error while reading data from range del block %s",
|
|
s.ToString().c_str());
|
|
IGNORE_STATUS_IF_ERROR(s);
|
|
} else {
|
|
rep_->fragmented_range_dels =
|
|
std::make_shared<FragmentedRangeTombstoneList>(std::move(iter),
|
|
internal_comparator);
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::PrefetchIndexAndFilterBlocks(
|
|
const ReadOptions& ro, FilePrefetchBuffer* prefetch_buffer,
|
|
InternalIterator* meta_iter, BlockBasedTable* new_table, bool prefetch_all,
|
|
const BlockBasedTableOptions& table_options, const int level,
|
|
size_t file_size, size_t max_file_size_for_l0_meta_pin,
|
|
BlockCacheLookupContext* lookup_context) {
|
|
Status s;
|
|
|
|
// Find filter handle and filter type
|
|
if (rep_->filter_policy) {
|
|
for (auto filter_type :
|
|
{Rep::FilterType::kFullFilter, Rep::FilterType::kPartitionedFilter,
|
|
Rep::FilterType::kBlockFilter}) {
|
|
std::string prefix;
|
|
switch (filter_type) {
|
|
case Rep::FilterType::kFullFilter:
|
|
prefix = kFullFilterBlockPrefix;
|
|
break;
|
|
case Rep::FilterType::kPartitionedFilter:
|
|
prefix = kPartitionedFilterBlockPrefix;
|
|
break;
|
|
case Rep::FilterType::kBlockFilter:
|
|
prefix = kFilterBlockPrefix;
|
|
break;
|
|
default:
|
|
assert(0);
|
|
}
|
|
std::string filter_block_key = prefix;
|
|
filter_block_key.append(rep_->filter_policy->Name());
|
|
if (FindMetaBlock(meta_iter, filter_block_key, &rep_->filter_handle)
|
|
.ok()) {
|
|
rep_->filter_type = filter_type;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// Partition filters cannot be enabled without partition indexes
|
|
assert(rep_->filter_type != Rep::FilterType::kPartitionedFilter ||
|
|
rep_->index_type == BlockBasedTableOptions::kTwoLevelIndexSearch);
|
|
|
|
// Find compression dictionary handle
|
|
bool found_compression_dict = false;
|
|
s = SeekToCompressionDictBlock(meta_iter, &found_compression_dict,
|
|
&rep_->compression_dict_handle);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
BlockBasedTableOptions::IndexType index_type = rep_->index_type;
|
|
|
|
const bool use_cache = table_options.cache_index_and_filter_blocks;
|
|
|
|
const bool maybe_flushed =
|
|
level == 0 && file_size <= max_file_size_for_l0_meta_pin;
|
|
std::function<bool(PinningTier, PinningTier)> is_pinned =
|
|
[maybe_flushed, &is_pinned](PinningTier pinning_tier,
|
|
PinningTier fallback_pinning_tier) {
|
|
// Fallback to fallback would lead to infinite recursion. Disallow it.
|
|
assert(fallback_pinning_tier != PinningTier::kFallback);
|
|
|
|
switch (pinning_tier) {
|
|
case PinningTier::kFallback:
|
|
return is_pinned(fallback_pinning_tier,
|
|
PinningTier::kNone /* fallback_pinning_tier */);
|
|
case PinningTier::kNone:
|
|
return false;
|
|
case PinningTier::kFlushedAndSimilar:
|
|
return maybe_flushed;
|
|
case PinningTier::kAll:
|
|
return true;
|
|
};
|
|
|
|
// In GCC, this is needed to suppress `control reaches end of non-void
|
|
// function [-Werror=return-type]`.
|
|
assert(false);
|
|
return false;
|
|
};
|
|
const bool pin_top_level_index = is_pinned(
|
|
table_options.metadata_cache_options.top_level_index_pinning,
|
|
table_options.pin_top_level_index_and_filter ? PinningTier::kAll
|
|
: PinningTier::kNone);
|
|
const bool pin_partition =
|
|
is_pinned(table_options.metadata_cache_options.partition_pinning,
|
|
table_options.pin_l0_filter_and_index_blocks_in_cache
|
|
? PinningTier::kFlushedAndSimilar
|
|
: PinningTier::kNone);
|
|
const bool pin_unpartitioned =
|
|
is_pinned(table_options.metadata_cache_options.unpartitioned_pinning,
|
|
table_options.pin_l0_filter_and_index_blocks_in_cache
|
|
? PinningTier::kFlushedAndSimilar
|
|
: PinningTier::kNone);
|
|
|
|
// pin the first level of index
|
|
const bool pin_index =
|
|
index_type == BlockBasedTableOptions::kTwoLevelIndexSearch
|
|
? pin_top_level_index
|
|
: pin_unpartitioned;
|
|
// prefetch the first level of index
|
|
const bool prefetch_index = prefetch_all || pin_index;
|
|
|
|
std::unique_ptr<IndexReader> index_reader;
|
|
s = new_table->CreateIndexReader(ro, prefetch_buffer, meta_iter, use_cache,
|
|
prefetch_index, pin_index, lookup_context,
|
|
&index_reader);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
rep_->index_reader = std::move(index_reader);
|
|
|
|
// The partitions of partitioned index are always stored in cache. They
|
|
// are hence follow the configuration for pin and prefetch regardless of
|
|
// the value of cache_index_and_filter_blocks
|
|
if (prefetch_all || pin_partition) {
|
|
s = rep_->index_reader->CacheDependencies(ro, pin_partition);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// pin the first level of filter
|
|
const bool pin_filter =
|
|
rep_->filter_type == Rep::FilterType::kPartitionedFilter
|
|
? pin_top_level_index
|
|
: pin_unpartitioned;
|
|
// prefetch the first level of filter
|
|
const bool prefetch_filter = prefetch_all || pin_filter;
|
|
|
|
if (rep_->filter_policy) {
|
|
auto filter = new_table->CreateFilterBlockReader(
|
|
ro, prefetch_buffer, use_cache, prefetch_filter, pin_filter,
|
|
lookup_context);
|
|
|
|
if (filter) {
|
|
// Refer to the comment above about paritioned indexes always being cached
|
|
if (prefetch_all || pin_partition) {
|
|
s = filter->CacheDependencies(ro, pin_partition);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
rep_->filter = std::move(filter);
|
|
}
|
|
}
|
|
|
|
if (!rep_->compression_dict_handle.IsNull()) {
|
|
std::unique_ptr<UncompressionDictReader> uncompression_dict_reader;
|
|
s = UncompressionDictReader::Create(
|
|
this, ro, prefetch_buffer, use_cache, prefetch_all || pin_unpartitioned,
|
|
pin_unpartitioned, lookup_context, &uncompression_dict_reader);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
rep_->uncompression_dict_reader = std::move(uncompression_dict_reader);
|
|
}
|
|
|
|
assert(s.ok());
|
|
return s;
|
|
}
|
|
|
|
void BlockBasedTable::SetupForCompaction() {
|
|
switch (rep_->ioptions.access_hint_on_compaction_start) {
|
|
case Options::NONE:
|
|
break;
|
|
case Options::NORMAL:
|
|
rep_->file->file()->Hint(FSRandomAccessFile::kNormal);
|
|
break;
|
|
case Options::SEQUENTIAL:
|
|
rep_->file->file()->Hint(FSRandomAccessFile::kSequential);
|
|
break;
|
|
case Options::WILLNEED:
|
|
rep_->file->file()->Hint(FSRandomAccessFile::kWillNeed);
|
|
break;
|
|
default:
|
|
assert(false);
|
|
}
|
|
}
|
|
|
|
std::shared_ptr<const TableProperties> BlockBasedTable::GetTableProperties()
|
|
const {
|
|
return rep_->table_properties;
|
|
}
|
|
|
|
size_t BlockBasedTable::ApproximateMemoryUsage() const {
|
|
size_t usage = 0;
|
|
if (rep_->filter) {
|
|
usage += rep_->filter->ApproximateMemoryUsage();
|
|
}
|
|
if (rep_->index_reader) {
|
|
usage += rep_->index_reader->ApproximateMemoryUsage();
|
|
}
|
|
if (rep_->uncompression_dict_reader) {
|
|
usage += rep_->uncompression_dict_reader->ApproximateMemoryUsage();
|
|
}
|
|
return usage;
|
|
}
|
|
|
|
// Load the meta-index-block from the file. On success, return the loaded
|
|
// metaindex
|
|
// block and its iterator.
|
|
Status BlockBasedTable::ReadMetaIndexBlock(
|
|
const ReadOptions& ro, FilePrefetchBuffer* prefetch_buffer,
|
|
std::unique_ptr<Block>* metaindex_block,
|
|
std::unique_ptr<InternalIterator>* iter) {
|
|
// TODO(sanjay): Skip this if footer.metaindex_handle() size indicates
|
|
// it is an empty block.
|
|
std::unique_ptr<Block> metaindex;
|
|
Status s = ReadBlockFromFile(
|
|
rep_->file.get(), prefetch_buffer, rep_->footer, ro,
|
|
rep_->footer.metaindex_handle(), &metaindex, rep_->ioptions,
|
|
true /* decompress */, true /*maybe_compressed*/, BlockType::kMetaIndex,
|
|
UncompressionDict::GetEmptyDict(), rep_->persistent_cache_options,
|
|
0 /* read_amp_bytes_per_bit */, GetMemoryAllocator(rep_->table_options),
|
|
false /* for_compaction */, rep_->blocks_definitely_zstd_compressed,
|
|
nullptr /* filter_policy */);
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_ERROR(rep_->ioptions.logger,
|
|
"Encountered error while reading data from properties"
|
|
" block %s",
|
|
s.ToString().c_str());
|
|
return s;
|
|
}
|
|
|
|
*metaindex_block = std::move(metaindex);
|
|
// meta block uses bytewise comparator.
|
|
iter->reset(metaindex_block->get()->NewDataIterator(
|
|
BytewiseComparator(), kDisableGlobalSequenceNumber));
|
|
return Status::OK();
|
|
}
|
|
|
|
template <typename TBlocklike>
|
|
Status BlockBasedTable::GetDataBlockFromCache(
|
|
const Slice& block_cache_key, const Slice& compressed_block_cache_key,
|
|
Cache* block_cache, Cache* block_cache_compressed,
|
|
const ReadOptions& read_options, CachableEntry<TBlocklike>* block,
|
|
const UncompressionDict& uncompression_dict, BlockType block_type,
|
|
const bool wait, GetContext* get_context) const {
|
|
const size_t read_amp_bytes_per_bit =
|
|
block_type == BlockType::kData
|
|
? rep_->table_options.read_amp_bytes_per_bit
|
|
: 0;
|
|
assert(block);
|
|
assert(block->IsEmpty());
|
|
const Cache::Priority priority =
|
|
rep_->table_options.cache_index_and_filter_blocks_with_high_priority &&
|
|
(block_type == BlockType::kFilter ||
|
|
block_type == BlockType::kCompressionDictionary ||
|
|
block_type == BlockType::kIndex)
|
|
? Cache::Priority::HIGH
|
|
: Cache::Priority::LOW;
|
|
|
|
Status s;
|
|
BlockContents* compressed_block = nullptr;
|
|
Cache::Handle* block_cache_compressed_handle = nullptr;
|
|
Statistics* statistics = rep_->ioptions.statistics.get();
|
|
bool using_zstd = rep_->blocks_definitely_zstd_compressed;
|
|
const FilterPolicy* filter_policy = rep_->filter_policy;
|
|
Cache::CreateCallback create_cb = GetCreateCallback<TBlocklike>(
|
|
read_amp_bytes_per_bit, statistics, using_zstd, filter_policy);
|
|
|
|
// Lookup uncompressed cache first
|
|
if (block_cache != nullptr) {
|
|
auto cache_handle = GetEntryFromCache(
|
|
block_cache, block_cache_key, block_type, wait, get_context,
|
|
BlocklikeTraits<TBlocklike>::GetCacheItemHelper(block_type), create_cb,
|
|
priority);
|
|
if (cache_handle != nullptr) {
|
|
block->SetCachedValue(
|
|
reinterpret_cast<TBlocklike*>(block_cache->Value(cache_handle)),
|
|
block_cache, cache_handle);
|
|
return s;
|
|
}
|
|
}
|
|
|
|
// If not found, search from the compressed block cache.
|
|
assert(block->IsEmpty());
|
|
|
|
if (block_cache_compressed == nullptr) {
|
|
return s;
|
|
}
|
|
|
|
assert(!compressed_block_cache_key.empty());
|
|
BlockContents contents;
|
|
Cache::CreateCallback create_cb_special = GetCreateCallback<BlockContents>(
|
|
read_amp_bytes_per_bit, statistics, using_zstd, filter_policy);
|
|
block_cache_compressed_handle = block_cache_compressed->Lookup(
|
|
compressed_block_cache_key,
|
|
BlocklikeTraits<BlockContents>::GetCacheItemHelper(block_type),
|
|
create_cb_special, priority, true);
|
|
|
|
// if we found in the compressed cache, then uncompress and insert into
|
|
// uncompressed cache
|
|
if (block_cache_compressed_handle == nullptr) {
|
|
RecordTick(statistics, BLOCK_CACHE_COMPRESSED_MISS);
|
|
return s;
|
|
}
|
|
|
|
// found compressed block
|
|
RecordTick(statistics, BLOCK_CACHE_COMPRESSED_HIT);
|
|
compressed_block = reinterpret_cast<BlockContents*>(
|
|
block_cache_compressed->Value(block_cache_compressed_handle));
|
|
CompressionType compression_type = compressed_block->get_compression_type();
|
|
assert(compression_type != kNoCompression);
|
|
|
|
// Retrieve the uncompressed contents into a new buffer
|
|
UncompressionContext context(compression_type);
|
|
UncompressionInfo info(context, uncompression_dict, compression_type);
|
|
s = UncompressBlockContents(
|
|
info, compressed_block->data.data(), compressed_block->data.size(),
|
|
&contents, rep_->table_options.format_version, rep_->ioptions,
|
|
GetMemoryAllocator(rep_->table_options));
|
|
|
|
// Insert uncompressed block into block cache, the priority is based on the
|
|
// data block type.
|
|
if (s.ok()) {
|
|
std::unique_ptr<TBlocklike> block_holder(
|
|
BlocklikeTraits<TBlocklike>::Create(
|
|
std::move(contents), read_amp_bytes_per_bit, statistics,
|
|
rep_->blocks_definitely_zstd_compressed,
|
|
rep_->table_options.filter_policy.get())); // uncompressed block
|
|
|
|
if (block_cache != nullptr && block_holder->own_bytes() &&
|
|
read_options.fill_cache) {
|
|
size_t charge = block_holder->ApproximateMemoryUsage();
|
|
Cache::Handle* cache_handle = nullptr;
|
|
s = block_cache->Insert(
|
|
block_cache_key, block_holder.get(),
|
|
BlocklikeTraits<TBlocklike>::GetCacheItemHelper(block_type), charge,
|
|
&cache_handle, priority);
|
|
if (s.ok()) {
|
|
assert(cache_handle != nullptr);
|
|
block->SetCachedValue(block_holder.release(), block_cache,
|
|
cache_handle);
|
|
|
|
UpdateCacheInsertionMetrics(block_type, get_context, charge,
|
|
s.IsOkOverwritten(), rep_->ioptions.stats);
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
}
|
|
} else {
|
|
block->SetOwnedValue(block_holder.release());
|
|
}
|
|
}
|
|
|
|
// Release hold on compressed cache entry
|
|
block_cache_compressed->Release(block_cache_compressed_handle);
|
|
return s;
|
|
}
|
|
|
|
template <typename TBlocklike>
|
|
Status BlockBasedTable::PutDataBlockToCache(
|
|
const Slice& block_cache_key, const Slice& compressed_block_cache_key,
|
|
Cache* block_cache, Cache* block_cache_compressed,
|
|
CachableEntry<TBlocklike>* cached_block, BlockContents* raw_block_contents,
|
|
CompressionType raw_block_comp_type,
|
|
const UncompressionDict& uncompression_dict,
|
|
MemoryAllocator* memory_allocator, BlockType block_type,
|
|
GetContext* get_context) const {
|
|
const ImmutableOptions& ioptions = rep_->ioptions;
|
|
const uint32_t format_version = rep_->table_options.format_version;
|
|
const size_t read_amp_bytes_per_bit =
|
|
block_type == BlockType::kData
|
|
? rep_->table_options.read_amp_bytes_per_bit
|
|
: 0;
|
|
const Cache::Priority priority =
|
|
rep_->table_options.cache_index_and_filter_blocks_with_high_priority &&
|
|
(block_type == BlockType::kFilter ||
|
|
block_type == BlockType::kCompressionDictionary ||
|
|
block_type == BlockType::kIndex)
|
|
? Cache::Priority::HIGH
|
|
: Cache::Priority::LOW;
|
|
assert(cached_block);
|
|
assert(cached_block->IsEmpty());
|
|
|
|
Status s;
|
|
Statistics* statistics = ioptions.stats;
|
|
|
|
std::unique_ptr<TBlocklike> block_holder;
|
|
if (raw_block_comp_type != kNoCompression) {
|
|
// Retrieve the uncompressed contents into a new buffer
|
|
BlockContents uncompressed_block_contents;
|
|
UncompressionContext context(raw_block_comp_type);
|
|
UncompressionInfo info(context, uncompression_dict, raw_block_comp_type);
|
|
s = UncompressBlockContents(info, raw_block_contents->data.data(),
|
|
raw_block_contents->data.size(),
|
|
&uncompressed_block_contents, format_version,
|
|
ioptions, memory_allocator);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
block_holder.reset(BlocklikeTraits<TBlocklike>::Create(
|
|
std::move(uncompressed_block_contents), read_amp_bytes_per_bit,
|
|
statistics, rep_->blocks_definitely_zstd_compressed,
|
|
rep_->table_options.filter_policy.get()));
|
|
} else {
|
|
block_holder.reset(BlocklikeTraits<TBlocklike>::Create(
|
|
std::move(*raw_block_contents), read_amp_bytes_per_bit, statistics,
|
|
rep_->blocks_definitely_zstd_compressed,
|
|
rep_->table_options.filter_policy.get()));
|
|
}
|
|
|
|
// Insert compressed block into compressed block cache.
|
|
// Release the hold on the compressed cache entry immediately.
|
|
if (block_cache_compressed != nullptr &&
|
|
raw_block_comp_type != kNoCompression && raw_block_contents != nullptr &&
|
|
raw_block_contents->own_bytes()) {
|
|
#ifndef NDEBUG
|
|
assert(raw_block_contents->is_raw_block);
|
|
#endif // NDEBUG
|
|
|
|
// We cannot directly put raw_block_contents because this could point to
|
|
// an object in the stack.
|
|
BlockContents* block_cont_for_comp_cache =
|
|
new BlockContents(std::move(*raw_block_contents));
|
|
s = block_cache_compressed->Insert(
|
|
compressed_block_cache_key, block_cont_for_comp_cache,
|
|
BlocklikeTraits<BlockContents>::GetCacheItemHelper(block_type),
|
|
block_cont_for_comp_cache->ApproximateMemoryUsage());
|
|
if (s.ok()) {
|
|
// Avoid the following code to delete this cached block.
|
|
RecordTick(statistics, BLOCK_CACHE_COMPRESSED_ADD);
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_COMPRESSED_ADD_FAILURES);
|
|
delete block_cont_for_comp_cache;
|
|
}
|
|
}
|
|
|
|
// insert into uncompressed block cache
|
|
if (block_cache != nullptr && block_holder->own_bytes()) {
|
|
size_t charge = block_holder->ApproximateMemoryUsage();
|
|
Cache::Handle* cache_handle = nullptr;
|
|
s = block_cache->Insert(
|
|
block_cache_key, block_holder.get(),
|
|
BlocklikeTraits<TBlocklike>::GetCacheItemHelper(block_type), charge,
|
|
&cache_handle, priority);
|
|
if (s.ok()) {
|
|
assert(cache_handle != nullptr);
|
|
cached_block->SetCachedValue(block_holder.release(), block_cache,
|
|
cache_handle);
|
|
|
|
UpdateCacheInsertionMetrics(block_type, get_context, charge,
|
|
s.IsOkOverwritten(), rep_->ioptions.stats);
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
}
|
|
} else {
|
|
cached_block->SetOwnedValue(block_holder.release());
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
std::unique_ptr<FilterBlockReader> BlockBasedTable::CreateFilterBlockReader(
|
|
const ReadOptions& ro, FilePrefetchBuffer* prefetch_buffer, bool use_cache,
|
|
bool prefetch, bool pin, BlockCacheLookupContext* lookup_context) {
|
|
auto& rep = rep_;
|
|
auto filter_type = rep->filter_type;
|
|
if (filter_type == Rep::FilterType::kNoFilter) {
|
|
return std::unique_ptr<FilterBlockReader>();
|
|
}
|
|
|
|
assert(rep->filter_policy);
|
|
|
|
switch (filter_type) {
|
|
case Rep::FilterType::kPartitionedFilter:
|
|
return PartitionedFilterBlockReader::Create(
|
|
this, ro, prefetch_buffer, use_cache, prefetch, pin, lookup_context);
|
|
|
|
case Rep::FilterType::kBlockFilter:
|
|
return BlockBasedFilterBlockReader::Create(
|
|
this, ro, prefetch_buffer, use_cache, prefetch, pin, lookup_context);
|
|
|
|
case Rep::FilterType::kFullFilter:
|
|
return FullFilterBlockReader::Create(this, ro, prefetch_buffer, use_cache,
|
|
prefetch, pin, lookup_context);
|
|
|
|
default:
|
|
// filter_type is either kNoFilter (exited the function at the first if),
|
|
// or it must be covered in this switch block
|
|
assert(false);
|
|
return std::unique_ptr<FilterBlockReader>();
|
|
}
|
|
}
|
|
|
|
// disable_prefix_seek should be set to true when prefix_extractor found in SST
|
|
// differs from the one in mutable_cf_options and index type is HashBasedIndex
|
|
InternalIteratorBase<IndexValue>* BlockBasedTable::NewIndexIterator(
|
|
const ReadOptions& read_options, bool disable_prefix_seek,
|
|
IndexBlockIter* input_iter, GetContext* get_context,
|
|
BlockCacheLookupContext* lookup_context) const {
|
|
assert(rep_ != nullptr);
|
|
assert(rep_->index_reader != nullptr);
|
|
|
|
// We don't return pinned data from index blocks, so no need
|
|
// to set `block_contents_pinned`.
|
|
return rep_->index_reader->NewIterator(read_options, disable_prefix_seek,
|
|
input_iter, get_context,
|
|
lookup_context);
|
|
}
|
|
|
|
template <>
|
|
DataBlockIter* BlockBasedTable::InitBlockIterator<DataBlockIter>(
|
|
const Rep* rep, Block* block, BlockType block_type,
|
|
DataBlockIter* input_iter, bool block_contents_pinned) {
|
|
return block->NewDataIterator(rep->internal_comparator.user_comparator(),
|
|
rep->get_global_seqno(block_type), input_iter,
|
|
rep->ioptions.stats, block_contents_pinned);
|
|
}
|
|
|
|
template <>
|
|
IndexBlockIter* BlockBasedTable::InitBlockIterator<IndexBlockIter>(
|
|
const Rep* rep, Block* block, BlockType block_type,
|
|
IndexBlockIter* input_iter, bool block_contents_pinned) {
|
|
return block->NewIndexIterator(
|
|
rep->internal_comparator.user_comparator(),
|
|
rep->get_global_seqno(block_type), input_iter, rep->ioptions.stats,
|
|
/* total_order_seek */ true, rep->index_has_first_key,
|
|
rep->index_key_includes_seq, rep->index_value_is_full,
|
|
block_contents_pinned);
|
|
}
|
|
|
|
// If contents is nullptr, this function looks up the block caches for the
|
|
// data block referenced by handle, and read the block from disk if necessary.
|
|
// If contents is non-null, it skips the cache lookup and disk read, since
|
|
// the caller has already read it. In both cases, if ro.fill_cache is true,
|
|
// it inserts the block into the block cache.
|
|
template <typename TBlocklike>
|
|
Status BlockBasedTable::MaybeReadBlockAndLoadToCache(
|
|
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
|
|
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
|
|
const bool wait, CachableEntry<TBlocklike>* block_entry,
|
|
BlockType block_type, GetContext* get_context,
|
|
BlockCacheLookupContext* lookup_context, BlockContents* contents) const {
|
|
assert(block_entry != nullptr);
|
|
const bool no_io = (ro.read_tier == kBlockCacheTier);
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
Cache* block_cache_compressed =
|
|
rep_->table_options.block_cache_compressed.get();
|
|
|
|
// First, try to get the block from the cache
|
|
//
|
|
// If either block cache is enabled, we'll try to read from it.
|
|
Status s;
|
|
char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
char compressed_cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
Slice key /* key to the block cache */;
|
|
Slice ckey /* key to the compressed block cache */;
|
|
bool is_cache_hit = false;
|
|
if (block_cache != nullptr || block_cache_compressed != nullptr) {
|
|
// create key for block cache
|
|
if (block_cache != nullptr) {
|
|
key = GetCacheKey(rep_->cache_key_prefix, rep_->cache_key_prefix_size,
|
|
handle, cache_key);
|
|
}
|
|
|
|
if (block_cache_compressed != nullptr) {
|
|
ckey = GetCacheKey(rep_->compressed_cache_key_prefix,
|
|
rep_->compressed_cache_key_prefix_size, handle,
|
|
compressed_cache_key);
|
|
}
|
|
|
|
if (!contents) {
|
|
s = GetDataBlockFromCache(key, ckey, block_cache, block_cache_compressed,
|
|
ro, block_entry, uncompression_dict, block_type,
|
|
wait, get_context);
|
|
// Value could still be null at this point, so check the cache handle
|
|
// and update the read pattern for prefetching
|
|
if (block_entry->GetValue() || block_entry->GetCacheHandle()) {
|
|
// TODO(haoyu): Differentiate cache hit on uncompressed block cache and
|
|
// compressed block cache.
|
|
is_cache_hit = true;
|
|
if (prefetch_buffer) {
|
|
// Update the block details so that PrefetchBuffer can use the read
|
|
// pattern to determine if reads are sequential or not for
|
|
// prefetching. It should also take in account blocks read from cache.
|
|
prefetch_buffer->UpdateReadPattern(handle.offset(),
|
|
block_size(handle));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Can't find the block from the cache. If I/O is allowed, read from the
|
|
// file.
|
|
if (block_entry->GetValue() == nullptr &&
|
|
block_entry->GetCacheHandle() == nullptr && !no_io && ro.fill_cache) {
|
|
Statistics* statistics = rep_->ioptions.stats;
|
|
const bool maybe_compressed =
|
|
block_type != BlockType::kFilter &&
|
|
block_type != BlockType::kCompressionDictionary &&
|
|
rep_->blocks_maybe_compressed;
|
|
const bool do_uncompress = maybe_compressed && !block_cache_compressed;
|
|
CompressionType raw_block_comp_type;
|
|
BlockContents raw_block_contents;
|
|
if (!contents) {
|
|
StopWatch sw(rep_->ioptions.clock, statistics, READ_BLOCK_GET_MICROS);
|
|
BlockFetcher block_fetcher(
|
|
rep_->file.get(), prefetch_buffer, rep_->footer, ro, handle,
|
|
&raw_block_contents, rep_->ioptions, do_uncompress,
|
|
maybe_compressed, block_type, uncompression_dict,
|
|
rep_->persistent_cache_options,
|
|
GetMemoryAllocator(rep_->table_options),
|
|
GetMemoryAllocatorForCompressedBlock(rep_->table_options));
|
|
s = block_fetcher.ReadBlockContents();
|
|
raw_block_comp_type = block_fetcher.get_compression_type();
|
|
contents = &raw_block_contents;
|
|
if (get_context) {
|
|
switch (block_type) {
|
|
case BlockType::kIndex:
|
|
++get_context->get_context_stats_.num_index_read;
|
|
break;
|
|
case BlockType::kFilter:
|
|
++get_context->get_context_stats_.num_filter_read;
|
|
break;
|
|
case BlockType::kData:
|
|
++get_context->get_context_stats_.num_data_read;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
raw_block_comp_type = contents->get_compression_type();
|
|
}
|
|
|
|
if (s.ok()) {
|
|
// If filling cache is allowed and a cache is configured, try to put the
|
|
// block to the cache.
|
|
s = PutDataBlockToCache(
|
|
key, ckey, block_cache, block_cache_compressed, block_entry,
|
|
contents, raw_block_comp_type, uncompression_dict,
|
|
GetMemoryAllocator(rep_->table_options), block_type, get_context);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Fill lookup_context.
|
|
if (block_cache_tracer_ && block_cache_tracer_->is_tracing_enabled() &&
|
|
lookup_context) {
|
|
size_t usage = 0;
|
|
uint64_t nkeys = 0;
|
|
if (block_entry->GetValue()) {
|
|
// Approximate the number of keys in the block using restarts.
|
|
nkeys =
|
|
rep_->table_options.block_restart_interval *
|
|
BlocklikeTraits<TBlocklike>::GetNumRestarts(*block_entry->GetValue());
|
|
usage = block_entry->GetValue()->ApproximateMemoryUsage();
|
|
}
|
|
TraceType trace_block_type = TraceType::kTraceMax;
|
|
switch (block_type) {
|
|
case BlockType::kData:
|
|
trace_block_type = TraceType::kBlockTraceDataBlock;
|
|
break;
|
|
case BlockType::kFilter:
|
|
trace_block_type = TraceType::kBlockTraceFilterBlock;
|
|
break;
|
|
case BlockType::kCompressionDictionary:
|
|
trace_block_type = TraceType::kBlockTraceUncompressionDictBlock;
|
|
break;
|
|
case BlockType::kRangeDeletion:
|
|
trace_block_type = TraceType::kBlockTraceRangeDeletionBlock;
|
|
break;
|
|
case BlockType::kIndex:
|
|
trace_block_type = TraceType::kBlockTraceIndexBlock;
|
|
break;
|
|
default:
|
|
// This cannot happen.
|
|
assert(false);
|
|
break;
|
|
}
|
|
bool no_insert = no_io || !ro.fill_cache;
|
|
if (BlockCacheTraceHelper::IsGetOrMultiGetOnDataBlock(
|
|
trace_block_type, lookup_context->caller)) {
|
|
// Defer logging the access to Get() and MultiGet() to trace additional
|
|
// information, e.g., referenced_key_exist_in_block.
|
|
|
|
// Make a copy of the block key here since it will be logged later.
|
|
lookup_context->FillLookupContext(
|
|
is_cache_hit, no_insert, trace_block_type,
|
|
/*block_size=*/usage, /*block_key=*/key.ToString(), nkeys);
|
|
} else {
|
|
// Avoid making copy of block_key and cf_name when constructing the access
|
|
// record.
|
|
BlockCacheTraceRecord access_record(
|
|
rep_->ioptions.clock->NowMicros(),
|
|
/*block_key=*/"", trace_block_type,
|
|
/*block_size=*/usage, rep_->cf_id_for_tracing(),
|
|
/*cf_name=*/"", rep_->level_for_tracing(),
|
|
rep_->sst_number_for_tracing(), lookup_context->caller, is_cache_hit,
|
|
no_insert, lookup_context->get_id,
|
|
lookup_context->get_from_user_specified_snapshot,
|
|
/*referenced_key=*/"");
|
|
// TODO: Should handle this error?
|
|
block_cache_tracer_
|
|
->WriteBlockAccess(access_record, key, rep_->cf_name_for_tracing(),
|
|
lookup_context->referenced_key)
|
|
.PermitUncheckedError();
|
|
}
|
|
}
|
|
|
|
assert(s.ok() || block_entry->GetValue() == nullptr);
|
|
return s;
|
|
}
|
|
|
|
// This function reads multiple data blocks from disk using Env::MultiRead()
|
|
// and optionally inserts them into the block cache. It uses the scratch
|
|
// buffer provided by the caller, which is contiguous. If scratch is a nullptr
|
|
// it allocates a separate buffer for each block. Typically, if the blocks
|
|
// need to be uncompressed and there is no compressed block cache, callers
|
|
// can allocate a temporary scratch buffer in order to minimize memory
|
|
// allocations.
|
|
// If options.fill_cache is true, it inserts the blocks into cache. If its
|
|
// false and scratch is non-null and the blocks are uncompressed, it copies
|
|
// the buffers to heap. In any case, the CachableEntry<Block> returned will
|
|
// own the data bytes.
|
|
// If compression is enabled and also there is no compressed block cache,
|
|
// the adjacent blocks are read out in one IO (combined read)
|
|
// batch - A MultiGetRange with only those keys with unique data blocks not
|
|
// found in cache
|
|
// handles - A vector of block handles. Some of them me be NULL handles
|
|
// scratch - An optional contiguous buffer to read compressed blocks into
|
|
void BlockBasedTable::RetrieveMultipleBlocks(
|
|
const ReadOptions& options, const MultiGetRange* batch,
|
|
const autovector<BlockHandle, MultiGetContext::MAX_BATCH_SIZE>* handles,
|
|
autovector<Status, MultiGetContext::MAX_BATCH_SIZE>* statuses,
|
|
autovector<CachableEntry<Block>, MultiGetContext::MAX_BATCH_SIZE>* results,
|
|
char* scratch, const UncompressionDict& uncompression_dict) const {
|
|
RandomAccessFileReader* file = rep_->file.get();
|
|
const Footer& footer = rep_->footer;
|
|
const ImmutableOptions& ioptions = rep_->ioptions;
|
|
size_t read_amp_bytes_per_bit = rep_->table_options.read_amp_bytes_per_bit;
|
|
MemoryAllocator* memory_allocator = GetMemoryAllocator(rep_->table_options);
|
|
|
|
if (ioptions.allow_mmap_reads) {
|
|
size_t idx_in_batch = 0;
|
|
for (auto mget_iter = batch->begin(); mget_iter != batch->end();
|
|
++mget_iter, ++idx_in_batch) {
|
|
BlockCacheLookupContext lookup_data_block_context(
|
|
TableReaderCaller::kUserMultiGet);
|
|
const BlockHandle& handle = (*handles)[idx_in_batch];
|
|
if (handle.IsNull()) {
|
|
continue;
|
|
}
|
|
|
|
(*statuses)[idx_in_batch] =
|
|
RetrieveBlock(nullptr, options, handle, uncompression_dict,
|
|
&(*results)[idx_in_batch], BlockType::kData,
|
|
mget_iter->get_context, &lookup_data_block_context,
|
|
/* for_compaction */ false, /* use_cache */ true,
|
|
/* wait_for_cache */ true);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// In direct IO mode, blocks share the direct io buffer.
|
|
// Otherwise, blocks share the scratch buffer.
|
|
const bool use_shared_buffer = file->use_direct_io() || scratch != nullptr;
|
|
|
|
autovector<FSReadRequest, MultiGetContext::MAX_BATCH_SIZE> read_reqs;
|
|
size_t buf_offset = 0;
|
|
size_t idx_in_batch = 0;
|
|
|
|
uint64_t prev_offset = 0;
|
|
size_t prev_len = 0;
|
|
autovector<size_t, MultiGetContext::MAX_BATCH_SIZE> req_idx_for_block;
|
|
autovector<size_t, MultiGetContext::MAX_BATCH_SIZE> req_offset_for_block;
|
|
for (auto mget_iter = batch->begin(); mget_iter != batch->end();
|
|
++mget_iter, ++idx_in_batch) {
|
|
const BlockHandle& handle = (*handles)[idx_in_batch];
|
|
if (handle.IsNull()) {
|
|
continue;
|
|
}
|
|
|
|
size_t prev_end = static_cast<size_t>(prev_offset) + prev_len;
|
|
|
|
// If current block is adjacent to the previous one, at the same time,
|
|
// compression is enabled and there is no compressed cache, we combine
|
|
// the two block read as one.
|
|
// We don't combine block reads here in direct IO mode, because when doing
|
|
// direct IO read, the block requests will be realigned and merged when
|
|
// necessary.
|
|
if (use_shared_buffer && !file->use_direct_io() &&
|
|
prev_end == handle.offset()) {
|
|
req_offset_for_block.emplace_back(prev_len);
|
|
prev_len += block_size(handle);
|
|
} else {
|
|
// No compression or current block and previous one is not adjacent:
|
|
// Step 1, create a new request for previous blocks
|
|
if (prev_len != 0) {
|
|
FSReadRequest req;
|
|
req.offset = prev_offset;
|
|
req.len = prev_len;
|
|
if (file->use_direct_io()) {
|
|
req.scratch = nullptr;
|
|
} else if (use_shared_buffer) {
|
|
req.scratch = scratch + buf_offset;
|
|
buf_offset += req.len;
|
|
} else {
|
|
req.scratch = new char[req.len];
|
|
}
|
|
read_reqs.emplace_back(req);
|
|
}
|
|
|
|
// Step 2, remeber the previous block info
|
|
prev_offset = handle.offset();
|
|
prev_len = block_size(handle);
|
|
req_offset_for_block.emplace_back(0);
|
|
}
|
|
req_idx_for_block.emplace_back(read_reqs.size());
|
|
|
|
PERF_COUNTER_ADD(block_read_count, 1);
|
|
PERF_COUNTER_ADD(block_read_byte, block_size(handle));
|
|
}
|
|
// Handle the last block and process the pending last request
|
|
if (prev_len != 0) {
|
|
FSReadRequest req;
|
|
req.offset = prev_offset;
|
|
req.len = prev_len;
|
|
if (file->use_direct_io()) {
|
|
req.scratch = nullptr;
|
|
} else if (use_shared_buffer) {
|
|
req.scratch = scratch + buf_offset;
|
|
} else {
|
|
req.scratch = new char[req.len];
|
|
}
|
|
read_reqs.emplace_back(req);
|
|
}
|
|
|
|
AlignedBuf direct_io_buf;
|
|
{
|
|
IOOptions opts;
|
|
IOStatus s = file->PrepareIOOptions(options, opts);
|
|
if (s.ok()) {
|
|
s = file->MultiRead(opts, &read_reqs[0], read_reqs.size(),
|
|
&direct_io_buf);
|
|
}
|
|
if (!s.ok()) {
|
|
// Discard all the results in this batch if there is any time out
|
|
// or overall MultiRead error
|
|
for (FSReadRequest& req : read_reqs) {
|
|
req.status = s;
|
|
}
|
|
}
|
|
}
|
|
|
|
idx_in_batch = 0;
|
|
size_t valid_batch_idx = 0;
|
|
for (auto mget_iter = batch->begin(); mget_iter != batch->end();
|
|
++mget_iter, ++idx_in_batch) {
|
|
const BlockHandle& handle = (*handles)[idx_in_batch];
|
|
|
|
if (handle.IsNull()) {
|
|
continue;
|
|
}
|
|
|
|
assert(valid_batch_idx < req_idx_for_block.size());
|
|
assert(valid_batch_idx < req_offset_for_block.size());
|
|
assert(req_idx_for_block[valid_batch_idx] < read_reqs.size());
|
|
size_t& req_idx = req_idx_for_block[valid_batch_idx];
|
|
size_t& req_offset = req_offset_for_block[valid_batch_idx];
|
|
valid_batch_idx++;
|
|
if (mget_iter->get_context) {
|
|
++(mget_iter->get_context->get_context_stats_.num_data_read);
|
|
}
|
|
FSReadRequest& req = read_reqs[req_idx];
|
|
Status s = req.status;
|
|
if (s.ok()) {
|
|
if ((req.result.size() != req.len) ||
|
|
(req_offset + block_size(handle) > req.result.size())) {
|
|
s = Status::Corruption(
|
|
"truncated block read from " + rep_->file->file_name() +
|
|
" offset " + ToString(handle.offset()) + ", expected " +
|
|
ToString(req.len) + " bytes, got " + ToString(req.result.size()));
|
|
}
|
|
}
|
|
|
|
BlockContents raw_block_contents;
|
|
if (s.ok()) {
|
|
if (!use_shared_buffer) {
|
|
// We allocated a buffer for this block. Give ownership of it to
|
|
// BlockContents so it can free the memory
|
|
assert(req.result.data() == req.scratch);
|
|
assert(req.result.size() == block_size(handle));
|
|
assert(req_offset == 0);
|
|
std::unique_ptr<char[]> raw_block(req.scratch);
|
|
raw_block_contents = BlockContents(std::move(raw_block), handle.size());
|
|
} else {
|
|
// We used the scratch buffer or direct io buffer
|
|
// which are shared by the blocks.
|
|
// raw_block_contents does not have the ownership.
|
|
raw_block_contents =
|
|
BlockContents(Slice(req.result.data() + req_offset, handle.size()));
|
|
}
|
|
#ifndef NDEBUG
|
|
raw_block_contents.is_raw_block = true;
|
|
#endif
|
|
|
|
if (options.verify_checksums) {
|
|
PERF_TIMER_GUARD(block_checksum_time);
|
|
const char* data = req.result.data();
|
|
// Since the scratch might be shared, the offset of the data block in
|
|
// the buffer might not be 0. req.result.data() only point to the
|
|
// begin address of each read request, we need to add the offset
|
|
// in each read request. Checksum is stored in the block trailer,
|
|
// beyond the payload size.
|
|
s = ROCKSDB_NAMESPACE::VerifyBlockChecksum(
|
|
footer.checksum(), data + req_offset, handle.size(),
|
|
rep_->file->file_name(), handle.offset());
|
|
TEST_SYNC_POINT_CALLBACK("RetrieveMultipleBlocks:VerifyChecksum", &s);
|
|
}
|
|
} else if (!use_shared_buffer) {
|
|
// Free the allocated scratch buffer.
|
|
delete[] req.scratch;
|
|
}
|
|
|
|
if (s.ok()) {
|
|
// When the blocks share the same underlying buffer (scratch or direct io
|
|
// buffer), we may need to manually copy the block into heap if the raw
|
|
// block has to be inserted into a cache. That falls into th following
|
|
// cases -
|
|
// 1. Raw block is not compressed, it needs to be inserted into the
|
|
// uncompressed block cache if there is one
|
|
// 2. If the raw block is compressed, it needs to be inserted into the
|
|
// compressed block cache if there is one
|
|
//
|
|
// In all other cases, the raw block is either uncompressed into a heap
|
|
// buffer or there is no cache at all.
|
|
CompressionType compression_type =
|
|
raw_block_contents.get_compression_type();
|
|
if (use_shared_buffer && (compression_type == kNoCompression ||
|
|
(compression_type != kNoCompression &&
|
|
rep_->table_options.block_cache_compressed))) {
|
|
Slice raw = Slice(req.result.data() + req_offset, block_size(handle));
|
|
raw_block_contents = BlockContents(
|
|
CopyBufferToHeap(GetMemoryAllocator(rep_->table_options), raw),
|
|
handle.size());
|
|
#ifndef NDEBUG
|
|
raw_block_contents.is_raw_block = true;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
if (options.fill_cache) {
|
|
BlockCacheLookupContext lookup_data_block_context(
|
|
TableReaderCaller::kUserMultiGet);
|
|
CachableEntry<Block>* block_entry = &(*results)[idx_in_batch];
|
|
// MaybeReadBlockAndLoadToCache will insert into the block caches if
|
|
// necessary. Since we're passing the raw block contents, it will
|
|
// avoid looking up the block cache
|
|
s = MaybeReadBlockAndLoadToCache(
|
|
nullptr, options, handle, uncompression_dict, /*wait=*/true,
|
|
block_entry, BlockType::kData, mget_iter->get_context,
|
|
&lookup_data_block_context, &raw_block_contents);
|
|
|
|
// block_entry value could be null if no block cache is present, i.e
|
|
// BlockBasedTableOptions::no_block_cache is true and no compressed
|
|
// block cache is configured. In that case, fall
|
|
// through and set up the block explicitly
|
|
if (block_entry->GetValue() != nullptr) {
|
|
s.PermitUncheckedError();
|
|
continue;
|
|
}
|
|
}
|
|
|
|
CompressionType compression_type =
|
|
raw_block_contents.get_compression_type();
|
|
BlockContents contents;
|
|
if (compression_type != kNoCompression) {
|
|
UncompressionContext context(compression_type);
|
|
UncompressionInfo info(context, uncompression_dict, compression_type);
|
|
s = UncompressBlockContents(info, req.result.data() + req_offset,
|
|
handle.size(), &contents, footer.version(),
|
|
rep_->ioptions, memory_allocator);
|
|
} else {
|
|
// There are two cases here:
|
|
// 1) caller uses the shared buffer (scratch or direct io buffer);
|
|
// 2) we use the requst buffer.
|
|
// If scratch buffer or direct io buffer is used, we ensure that
|
|
// all raw blocks are copyed to the heap as single blocks. If scratch
|
|
// buffer is not used, we also have no combined read, so the raw
|
|
// block can be used directly.
|
|
contents = std::move(raw_block_contents);
|
|
}
|
|
if (s.ok()) {
|
|
(*results)[idx_in_batch].SetOwnedValue(new Block(
|
|
std::move(contents), read_amp_bytes_per_bit, ioptions.stats));
|
|
}
|
|
}
|
|
(*statuses)[idx_in_batch] = s;
|
|
}
|
|
}
|
|
|
|
template <typename TBlocklike>
|
|
Status BlockBasedTable::RetrieveBlock(
|
|
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
|
|
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
|
|
CachableEntry<TBlocklike>* block_entry, BlockType block_type,
|
|
GetContext* get_context, BlockCacheLookupContext* lookup_context,
|
|
bool for_compaction, bool use_cache, bool wait_for_cache) const {
|
|
assert(block_entry);
|
|
assert(block_entry->IsEmpty());
|
|
|
|
Status s;
|
|
if (use_cache) {
|
|
s = MaybeReadBlockAndLoadToCache(
|
|
prefetch_buffer, ro, handle, uncompression_dict, wait_for_cache,
|
|
block_entry, block_type, get_context, lookup_context,
|
|
/*contents=*/nullptr);
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
if (block_entry->GetValue() != nullptr ||
|
|
block_entry->GetCacheHandle() != nullptr) {
|
|
assert(s.ok());
|
|
return s;
|
|
}
|
|
}
|
|
|
|
assert(block_entry->IsEmpty());
|
|
|
|
const bool no_io = ro.read_tier == kBlockCacheTier;
|
|
if (no_io) {
|
|
return Status::Incomplete("no blocking io");
|
|
}
|
|
|
|
const bool maybe_compressed =
|
|
block_type != BlockType::kFilter &&
|
|
block_type != BlockType::kCompressionDictionary &&
|
|
rep_->blocks_maybe_compressed;
|
|
const bool do_uncompress = maybe_compressed;
|
|
std::unique_ptr<TBlocklike> block;
|
|
|
|
{
|
|
StopWatch sw(rep_->ioptions.clock, rep_->ioptions.stats,
|
|
READ_BLOCK_GET_MICROS);
|
|
s = ReadBlockFromFile(
|
|
rep_->file.get(), prefetch_buffer, rep_->footer, ro, handle, &block,
|
|
rep_->ioptions, do_uncompress, maybe_compressed, block_type,
|
|
uncompression_dict, rep_->persistent_cache_options,
|
|
block_type == BlockType::kData
|
|
? rep_->table_options.read_amp_bytes_per_bit
|
|
: 0,
|
|
GetMemoryAllocator(rep_->table_options), for_compaction,
|
|
rep_->blocks_definitely_zstd_compressed,
|
|
rep_->table_options.filter_policy.get());
|
|
|
|
if (get_context) {
|
|
switch (block_type) {
|
|
case BlockType::kIndex:
|
|
++(get_context->get_context_stats_.num_index_read);
|
|
break;
|
|
case BlockType::kFilter:
|
|
++(get_context->get_context_stats_.num_filter_read);
|
|
break;
|
|
case BlockType::kData:
|
|
++(get_context->get_context_stats_.num_data_read);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
block_entry->SetOwnedValue(block.release());
|
|
|
|
assert(s.ok());
|
|
return s;
|
|
}
|
|
|
|
// Explicitly instantiate templates for both "blocklike" types we use.
|
|
// This makes it possible to keep the template definitions in the .cc file.
|
|
template Status BlockBasedTable::RetrieveBlock<BlockContents>(
|
|
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
|
|
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
|
|
CachableEntry<BlockContents>* block_entry, BlockType block_type,
|
|
GetContext* get_context, BlockCacheLookupContext* lookup_context,
|
|
bool for_compaction, bool use_cache, bool wait_for_cache) const;
|
|
|
|
template Status BlockBasedTable::RetrieveBlock<ParsedFullFilterBlock>(
|
|
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
|
|
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
|
|
CachableEntry<ParsedFullFilterBlock>* block_entry, BlockType block_type,
|
|
GetContext* get_context, BlockCacheLookupContext* lookup_context,
|
|
bool for_compaction, bool use_cache, bool wait_for_cache) const;
|
|
|
|
template Status BlockBasedTable::RetrieveBlock<Block>(
|
|
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
|
|
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
|
|
CachableEntry<Block>* block_entry, BlockType block_type,
|
|
GetContext* get_context, BlockCacheLookupContext* lookup_context,
|
|
bool for_compaction, bool use_cache, bool wait_for_cache) const;
|
|
|
|
template Status BlockBasedTable::RetrieveBlock<UncompressionDict>(
|
|
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
|
|
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
|
|
CachableEntry<UncompressionDict>* block_entry, BlockType block_type,
|
|
GetContext* get_context, BlockCacheLookupContext* lookup_context,
|
|
bool for_compaction, bool use_cache, bool wait_for_cache) const;
|
|
|
|
BlockBasedTable::PartitionedIndexIteratorState::PartitionedIndexIteratorState(
|
|
const BlockBasedTable* table,
|
|
std::unordered_map<uint64_t, CachableEntry<Block>>* block_map)
|
|
: table_(table), block_map_(block_map) {}
|
|
|
|
InternalIteratorBase<IndexValue>*
|
|
BlockBasedTable::PartitionedIndexIteratorState::NewSecondaryIterator(
|
|
const BlockHandle& handle) {
|
|
// Return a block iterator on the index partition
|
|
auto block = block_map_->find(handle.offset());
|
|
// This is a possible scenario since block cache might not have had space
|
|
// for the partition
|
|
if (block != block_map_->end()) {
|
|
const Rep* rep = table_->get_rep();
|
|
assert(rep);
|
|
|
|
Statistics* kNullStats = nullptr;
|
|
// We don't return pinned data from index blocks, so no need
|
|
// to set `block_contents_pinned`.
|
|
return block->second.GetValue()->NewIndexIterator(
|
|
rep->internal_comparator.user_comparator(),
|
|
rep->get_global_seqno(BlockType::kIndex), nullptr, kNullStats, true,
|
|
rep->index_has_first_key, rep->index_key_includes_seq,
|
|
rep->index_value_is_full);
|
|
}
|
|
// Create an empty iterator
|
|
// TODO(ajkr): this is not the right way to handle an unpinned partition.
|
|
return new IndexBlockIter();
|
|
}
|
|
|
|
// This will be broken if the user specifies an unusual implementation
|
|
// of Options.comparator, or if the user specifies an unusual
|
|
// definition of prefixes in BlockBasedTableOptions.filter_policy.
|
|
// In particular, we require the following three properties:
|
|
//
|
|
// 1) key.starts_with(prefix(key))
|
|
// 2) Compare(prefix(key), key) <= 0.
|
|
// 3) If Compare(key1, key2) <= 0, then Compare(prefix(key1), prefix(key2)) <= 0
|
|
//
|
|
// If read_options.read_tier == kBlockCacheTier, this method will do no I/O and
|
|
// will return true if the filter block is not in memory and not found in block
|
|
// cache.
|
|
//
|
|
// REQUIRES: this method shouldn't be called while the DB lock is held.
|
|
bool BlockBasedTable::PrefixMayMatch(
|
|
const Slice& internal_key, const ReadOptions& read_options,
|
|
const SliceTransform* options_prefix_extractor,
|
|
const bool need_upper_bound_check,
|
|
BlockCacheLookupContext* lookup_context) const {
|
|
if (!rep_->filter_policy) {
|
|
return true;
|
|
}
|
|
|
|
const SliceTransform* prefix_extractor;
|
|
|
|
if (rep_->table_prefix_extractor == nullptr) {
|
|
if (need_upper_bound_check) {
|
|
return true;
|
|
}
|
|
prefix_extractor = options_prefix_extractor;
|
|
} else {
|
|
prefix_extractor = rep_->table_prefix_extractor.get();
|
|
}
|
|
auto ts_sz = rep_->internal_comparator.user_comparator()->timestamp_size();
|
|
auto user_key_without_ts =
|
|
ExtractUserKeyAndStripTimestamp(internal_key, ts_sz);
|
|
if (!prefix_extractor->InDomain(user_key_without_ts)) {
|
|
return true;
|
|
}
|
|
|
|
bool may_match = true;
|
|
|
|
// First, try check with full filter
|
|
FilterBlockReader* const filter = rep_->filter.get();
|
|
bool filter_checked = true;
|
|
if (filter != nullptr) {
|
|
const bool no_io = read_options.read_tier == kBlockCacheTier;
|
|
|
|
if (!filter->IsBlockBased()) {
|
|
const Slice* const const_ikey_ptr = &internal_key;
|
|
may_match = filter->RangeMayExist(
|
|
read_options.iterate_upper_bound, user_key_without_ts,
|
|
prefix_extractor, rep_->internal_comparator.user_comparator(),
|
|
const_ikey_ptr, &filter_checked, need_upper_bound_check, no_io,
|
|
lookup_context);
|
|
} else {
|
|
// if prefix_extractor changed for block based filter, skip filter
|
|
if (need_upper_bound_check) {
|
|
return true;
|
|
}
|
|
auto prefix = prefix_extractor->Transform(user_key_without_ts);
|
|
InternalKey internal_key_prefix(prefix, kMaxSequenceNumber, kTypeValue);
|
|
auto internal_prefix = internal_key_prefix.Encode();
|
|
|
|
// To prevent any io operation in this method, we set `read_tier` to make
|
|
// sure we always read index or filter only when they have already been
|
|
// loaded to memory.
|
|
ReadOptions no_io_read_options;
|
|
no_io_read_options.read_tier = kBlockCacheTier;
|
|
|
|
// Then, try find it within each block
|
|
// we already know prefix_extractor and prefix_extractor_name must match
|
|
// because `CheckPrefixMayMatch` first checks `check_filter_ == true`
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter(NewIndexIterator(
|
|
no_io_read_options,
|
|
/*need_upper_bound_check=*/false, /*input_iter=*/nullptr,
|
|
/*get_context=*/nullptr, lookup_context));
|
|
iiter->Seek(internal_prefix);
|
|
|
|
if (!iiter->Valid()) {
|
|
// we're past end of file
|
|
// if it's incomplete, it means that we avoided I/O
|
|
// and we're not really sure that we're past the end
|
|
// of the file
|
|
may_match = iiter->status().IsIncomplete();
|
|
} else if ((rep_->index_key_includes_seq ? ExtractUserKey(iiter->key())
|
|
: iiter->key())
|
|
.starts_with(ExtractUserKey(internal_prefix))) {
|
|
// we need to check for this subtle case because our only
|
|
// guarantee is that "the key is a string >= last key in that data
|
|
// block" according to the doc/table_format.txt spec.
|
|
//
|
|
// Suppose iiter->key() starts with the desired prefix; it is not
|
|
// necessarily the case that the corresponding data block will
|
|
// contain the prefix, since iiter->key() need not be in the
|
|
// block. However, the next data block may contain the prefix, so
|
|
// we return true to play it safe.
|
|
may_match = true;
|
|
} else if (filter->IsBlockBased()) {
|
|
// iiter->key() does NOT start with the desired prefix. Because
|
|
// Seek() finds the first key that is >= the seek target, this
|
|
// means that iiter->key() > prefix. Thus, any data blocks coming
|
|
// after the data block corresponding to iiter->key() cannot
|
|
// possibly contain the key. Thus, the corresponding data block
|
|
// is the only on could potentially contain the prefix.
|
|
BlockHandle handle = iiter->value().handle;
|
|
may_match = filter->PrefixMayMatch(
|
|
prefix, prefix_extractor, handle.offset(), no_io,
|
|
/*const_key_ptr=*/nullptr, /*get_context=*/nullptr, lookup_context);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (filter_checked) {
|
|
Statistics* statistics = rep_->ioptions.stats;
|
|
RecordTick(statistics, BLOOM_FILTER_PREFIX_CHECKED);
|
|
if (!may_match) {
|
|
RecordTick(statistics, BLOOM_FILTER_PREFIX_USEFUL);
|
|
}
|
|
}
|
|
|
|
return may_match;
|
|
}
|
|
|
|
|
|
InternalIterator* BlockBasedTable::NewIterator(
|
|
const ReadOptions& read_options, const SliceTransform* prefix_extractor,
|
|
Arena* arena, bool skip_filters, TableReaderCaller caller,
|
|
size_t compaction_readahead_size, bool allow_unprepared_value) {
|
|
BlockCacheLookupContext lookup_context{caller};
|
|
bool need_upper_bound_check =
|
|
read_options.auto_prefix_mode ||
|
|
PrefixExtractorChanged(rep_->table_properties.get(), prefix_extractor);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> index_iter(NewIndexIterator(
|
|
read_options,
|
|
need_upper_bound_check &&
|
|
rep_->index_type == BlockBasedTableOptions::kHashSearch,
|
|
/*input_iter=*/nullptr, /*get_context=*/nullptr, &lookup_context));
|
|
if (arena == nullptr) {
|
|
return new BlockBasedTableIterator(
|
|
this, read_options, rep_->internal_comparator, std::move(index_iter),
|
|
!skip_filters && !read_options.total_order_seek &&
|
|
prefix_extractor != nullptr,
|
|
need_upper_bound_check, prefix_extractor, caller,
|
|
compaction_readahead_size, allow_unprepared_value);
|
|
} else {
|
|
auto* mem = arena->AllocateAligned(sizeof(BlockBasedTableIterator));
|
|
return new (mem) BlockBasedTableIterator(
|
|
this, read_options, rep_->internal_comparator, std::move(index_iter),
|
|
!skip_filters && !read_options.total_order_seek &&
|
|
prefix_extractor != nullptr,
|
|
need_upper_bound_check, prefix_extractor, caller,
|
|
compaction_readahead_size, allow_unprepared_value);
|
|
}
|
|
}
|
|
|
|
FragmentedRangeTombstoneIterator* BlockBasedTable::NewRangeTombstoneIterator(
|
|
const ReadOptions& read_options) {
|
|
if (rep_->fragmented_range_dels == nullptr) {
|
|
return nullptr;
|
|
}
|
|
SequenceNumber snapshot = kMaxSequenceNumber;
|
|
if (read_options.snapshot != nullptr) {
|
|
snapshot = read_options.snapshot->GetSequenceNumber();
|
|
}
|
|
return new FragmentedRangeTombstoneIterator(
|
|
rep_->fragmented_range_dels, rep_->internal_comparator, snapshot);
|
|
}
|
|
|
|
bool BlockBasedTable::FullFilterKeyMayMatch(
|
|
const ReadOptions& read_options, FilterBlockReader* filter,
|
|
const Slice& internal_key, const bool no_io,
|
|
const SliceTransform* prefix_extractor, GetContext* get_context,
|
|
BlockCacheLookupContext* lookup_context) const {
|
|
if (filter == nullptr || filter->IsBlockBased()) {
|
|
return true;
|
|
}
|
|
Slice user_key = ExtractUserKey(internal_key);
|
|
const Slice* const const_ikey_ptr = &internal_key;
|
|
bool may_match = true;
|
|
size_t ts_sz = rep_->internal_comparator.user_comparator()->timestamp_size();
|
|
Slice user_key_without_ts = StripTimestampFromUserKey(user_key, ts_sz);
|
|
if (rep_->whole_key_filtering) {
|
|
may_match =
|
|
filter->KeyMayMatch(user_key_without_ts, prefix_extractor, kNotValid,
|
|
no_io, const_ikey_ptr, get_context, lookup_context);
|
|
} else if (!read_options.total_order_seek && prefix_extractor &&
|
|
rep_->table_properties->prefix_extractor_name.compare(
|
|
prefix_extractor->Name()) == 0 &&
|
|
prefix_extractor->InDomain(user_key_without_ts) &&
|
|
!filter->PrefixMayMatch(
|
|
prefix_extractor->Transform(user_key_without_ts),
|
|
prefix_extractor, kNotValid, no_io, const_ikey_ptr,
|
|
get_context, lookup_context)) {
|
|
may_match = false;
|
|
}
|
|
if (may_match) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_FULL_POSITIVE);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_positive, 1, rep_->level);
|
|
}
|
|
return may_match;
|
|
}
|
|
|
|
void BlockBasedTable::FullFilterKeysMayMatch(
|
|
const ReadOptions& read_options, FilterBlockReader* filter,
|
|
MultiGetRange* range, const bool no_io,
|
|
const SliceTransform* prefix_extractor,
|
|
BlockCacheLookupContext* lookup_context) const {
|
|
if (filter == nullptr || filter->IsBlockBased()) {
|
|
return;
|
|
}
|
|
uint64_t before_keys = range->KeysLeft();
|
|
assert(before_keys > 0); // Caller should ensure
|
|
if (rep_->whole_key_filtering) {
|
|
filter->KeysMayMatch(range, prefix_extractor, kNotValid, no_io,
|
|
lookup_context);
|
|
uint64_t after_keys = range->KeysLeft();
|
|
if (after_keys) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_FULL_POSITIVE, after_keys);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_positive, after_keys,
|
|
rep_->level);
|
|
}
|
|
uint64_t filtered_keys = before_keys - after_keys;
|
|
if (filtered_keys) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_USEFUL, filtered_keys);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, filtered_keys,
|
|
rep_->level);
|
|
}
|
|
} else if (!read_options.total_order_seek && prefix_extractor &&
|
|
rep_->table_properties->prefix_extractor_name.compare(
|
|
prefix_extractor->Name()) == 0) {
|
|
filter->PrefixesMayMatch(range, prefix_extractor, kNotValid, false,
|
|
lookup_context);
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_PREFIX_CHECKED, before_keys);
|
|
uint64_t after_keys = range->KeysLeft();
|
|
uint64_t filtered_keys = before_keys - after_keys;
|
|
if (filtered_keys) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_PREFIX_USEFUL,
|
|
filtered_keys);
|
|
}
|
|
}
|
|
}
|
|
|
|
Status BlockBasedTable::Get(const ReadOptions& read_options, const Slice& key,
|
|
GetContext* get_context,
|
|
const SliceTransform* prefix_extractor,
|
|
bool skip_filters) {
|
|
assert(key.size() >= 8); // key must be internal key
|
|
assert(get_context != nullptr);
|
|
Status s;
|
|
const bool no_io = read_options.read_tier == kBlockCacheTier;
|
|
|
|
FilterBlockReader* const filter =
|
|
!skip_filters ? rep_->filter.get() : nullptr;
|
|
|
|
// First check the full filter
|
|
// If full filter not useful, Then go into each block
|
|
uint64_t tracing_get_id = get_context->get_tracing_get_id();
|
|
BlockCacheLookupContext lookup_context{
|
|
TableReaderCaller::kUserGet, tracing_get_id,
|
|
/*get_from_user_specified_snapshot=*/read_options.snapshot != nullptr};
|
|
if (block_cache_tracer_ && block_cache_tracer_->is_tracing_enabled()) {
|
|
// Trace the key since it contains both user key and sequence number.
|
|
lookup_context.referenced_key = key.ToString();
|
|
lookup_context.get_from_user_specified_snapshot =
|
|
read_options.snapshot != nullptr;
|
|
}
|
|
TEST_SYNC_POINT("BlockBasedTable::Get:BeforeFilterMatch");
|
|
const bool may_match =
|
|
FullFilterKeyMayMatch(read_options, filter, key, no_io, prefix_extractor,
|
|
get_context, &lookup_context);
|
|
TEST_SYNC_POINT("BlockBasedTable::Get:AfterFilterMatch");
|
|
if (!may_match) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_USEFUL);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, rep_->level);
|
|
} else {
|
|
IndexBlockIter iiter_on_stack;
|
|
// if prefix_extractor found in block differs from options, disable
|
|
// BlockPrefixIndex. Only do this check when index_type is kHashSearch.
|
|
bool need_upper_bound_check = false;
|
|
if (rep_->index_type == BlockBasedTableOptions::kHashSearch) {
|
|
need_upper_bound_check = PrefixExtractorChanged(
|
|
rep_->table_properties.get(), prefix_extractor);
|
|
}
|
|
auto iiter =
|
|
NewIndexIterator(read_options, need_upper_bound_check, &iiter_on_stack,
|
|
get_context, &lookup_context);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr.reset(iiter);
|
|
}
|
|
|
|
size_t ts_sz =
|
|
rep_->internal_comparator.user_comparator()->timestamp_size();
|
|
bool matched = false; // if such user key matched a key in SST
|
|
bool done = false;
|
|
for (iiter->Seek(key); iiter->Valid() && !done; iiter->Next()) {
|
|
IndexValue v = iiter->value();
|
|
|
|
bool not_exist_in_filter =
|
|
filter != nullptr && filter->IsBlockBased() == true &&
|
|
!filter->KeyMayMatch(ExtractUserKeyAndStripTimestamp(key, ts_sz),
|
|
prefix_extractor, v.handle.offset(), no_io,
|
|
/*const_ikey_ptr=*/nullptr, get_context,
|
|
&lookup_context);
|
|
|
|
if (not_exist_in_filter) {
|
|
// Not found
|
|
// TODO: think about interaction with Merge. If a user key cannot
|
|
// cross one data block, we should be fine.
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_USEFUL);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, rep_->level);
|
|
break;
|
|
}
|
|
|
|
if (!v.first_internal_key.empty() && !skip_filters &&
|
|
UserComparatorWrapper(rep_->internal_comparator.user_comparator())
|
|
.CompareWithoutTimestamp(
|
|
ExtractUserKey(key),
|
|
ExtractUserKey(v.first_internal_key)) < 0) {
|
|
// The requested key falls between highest key in previous block and
|
|
// lowest key in current block.
|
|
break;
|
|
}
|
|
|
|
BlockCacheLookupContext lookup_data_block_context{
|
|
TableReaderCaller::kUserGet, tracing_get_id,
|
|
/*get_from_user_specified_snapshot=*/read_options.snapshot !=
|
|
nullptr};
|
|
bool does_referenced_key_exist = false;
|
|
DataBlockIter biter;
|
|
uint64_t referenced_data_size = 0;
|
|
NewDataBlockIterator<DataBlockIter>(
|
|
read_options, v.handle, &biter, BlockType::kData, get_context,
|
|
&lookup_data_block_context,
|
|
/*s=*/Status(), /*prefetch_buffer*/ nullptr);
|
|
|
|
if (no_io && biter.status().IsIncomplete()) {
|
|
// couldn't get block from block_cache
|
|
// Update Saver.state to Found because we are only looking for
|
|
// whether we can guarantee the key is not there when "no_io" is set
|
|
get_context->MarkKeyMayExist();
|
|
s = biter.status();
|
|
break;
|
|
}
|
|
if (!biter.status().ok()) {
|
|
s = biter.status();
|
|
break;
|
|
}
|
|
|
|
bool may_exist = biter.SeekForGet(key);
|
|
// If user-specified timestamp is supported, we cannot end the search
|
|
// just because hash index lookup indicates the key+ts does not exist.
|
|
if (!may_exist && ts_sz == 0) {
|
|
// HashSeek cannot find the key this block and the the iter is not
|
|
// the end of the block, i.e. cannot be in the following blocks
|
|
// either. In this case, the seek_key cannot be found, so we break
|
|
// from the top level for-loop.
|
|
done = true;
|
|
} else {
|
|
// Call the *saver function on each entry/block until it returns false
|
|
for (; biter.Valid(); biter.Next()) {
|
|
ParsedInternalKey parsed_key;
|
|
Status pik_status = ParseInternalKey(
|
|
biter.key(), &parsed_key, false /* log_err_key */); // TODO
|
|
if (!pik_status.ok()) {
|
|
s = pik_status;
|
|
}
|
|
|
|
if (!get_context->SaveValue(
|
|
parsed_key, biter.value(), &matched,
|
|
biter.IsValuePinned() ? &biter : nullptr)) {
|
|
if (get_context->State() == GetContext::GetState::kFound) {
|
|
does_referenced_key_exist = true;
|
|
referenced_data_size = biter.key().size() + biter.value().size();
|
|
}
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
s = biter.status();
|
|
}
|
|
// Write the block cache access record.
|
|
if (block_cache_tracer_ && block_cache_tracer_->is_tracing_enabled()) {
|
|
// Avoid making copy of block_key, cf_name, and referenced_key when
|
|
// constructing the access record.
|
|
Slice referenced_key;
|
|
if (does_referenced_key_exist) {
|
|
referenced_key = biter.key();
|
|
} else {
|
|
referenced_key = key;
|
|
}
|
|
BlockCacheTraceRecord access_record(
|
|
rep_->ioptions.clock->NowMicros(),
|
|
/*block_key=*/"", lookup_data_block_context.block_type,
|
|
lookup_data_block_context.block_size, rep_->cf_id_for_tracing(),
|
|
/*cf_name=*/"", rep_->level_for_tracing(),
|
|
rep_->sst_number_for_tracing(), lookup_data_block_context.caller,
|
|
lookup_data_block_context.is_cache_hit,
|
|
lookup_data_block_context.no_insert,
|
|
lookup_data_block_context.get_id,
|
|
lookup_data_block_context.get_from_user_specified_snapshot,
|
|
/*referenced_key=*/"", referenced_data_size,
|
|
lookup_data_block_context.num_keys_in_block,
|
|
does_referenced_key_exist);
|
|
// TODO: Should handle status here?
|
|
block_cache_tracer_
|
|
->WriteBlockAccess(access_record,
|
|
lookup_data_block_context.block_key,
|
|
rep_->cf_name_for_tracing(), referenced_key)
|
|
.PermitUncheckedError();
|
|
}
|
|
|
|
if (done) {
|
|
// Avoid the extra Next which is expensive in two-level indexes
|
|
break;
|
|
}
|
|
}
|
|
if (matched && filter != nullptr && !filter->IsBlockBased()) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_FULL_TRUE_POSITIVE);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_true_positive, 1,
|
|
rep_->level);
|
|
}
|
|
if (s.ok() && !iiter->status().IsNotFound()) {
|
|
s = iiter->status();
|
|
}
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
using MultiGetRange = MultiGetContext::Range;
|
|
void BlockBasedTable::MultiGet(const ReadOptions& read_options,
|
|
const MultiGetRange* mget_range,
|
|
const SliceTransform* prefix_extractor,
|
|
bool skip_filters) {
|
|
if (mget_range->empty()) {
|
|
// Caller should ensure non-empty (performance bug)
|
|
assert(false);
|
|
return; // Nothing to do
|
|
}
|
|
|
|
FilterBlockReader* const filter =
|
|
!skip_filters ? rep_->filter.get() : nullptr;
|
|
MultiGetRange sst_file_range(*mget_range, mget_range->begin(),
|
|
mget_range->end());
|
|
|
|
// First check the full filter
|
|
// If full filter not useful, Then go into each block
|
|
const bool no_io = read_options.read_tier == kBlockCacheTier;
|
|
uint64_t tracing_mget_id = BlockCacheTraceHelper::kReservedGetId;
|
|
if (sst_file_range.begin()->get_context) {
|
|
tracing_mget_id = sst_file_range.begin()->get_context->get_tracing_get_id();
|
|
}
|
|
BlockCacheLookupContext lookup_context{
|
|
TableReaderCaller::kUserMultiGet, tracing_mget_id,
|
|
/*get_from_user_specified_snapshot=*/read_options.snapshot != nullptr};
|
|
FullFilterKeysMayMatch(read_options, filter, &sst_file_range, no_io,
|
|
prefix_extractor, &lookup_context);
|
|
|
|
if (!sst_file_range.empty()) {
|
|
IndexBlockIter iiter_on_stack;
|
|
// if prefix_extractor found in block differs from options, disable
|
|
// BlockPrefixIndex. Only do this check when index_type is kHashSearch.
|
|
bool need_upper_bound_check = false;
|
|
if (rep_->index_type == BlockBasedTableOptions::kHashSearch) {
|
|
need_upper_bound_check = PrefixExtractorChanged(
|
|
rep_->table_properties.get(), prefix_extractor);
|
|
}
|
|
auto iiter =
|
|
NewIndexIterator(read_options, need_upper_bound_check, &iiter_on_stack,
|
|
sst_file_range.begin()->get_context, &lookup_context);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr.reset(iiter);
|
|
}
|
|
|
|
uint64_t offset = std::numeric_limits<uint64_t>::max();
|
|
autovector<BlockHandle, MultiGetContext::MAX_BATCH_SIZE> block_handles;
|
|
autovector<CachableEntry<Block>, MultiGetContext::MAX_BATCH_SIZE> results;
|
|
autovector<Status, MultiGetContext::MAX_BATCH_SIZE> statuses;
|
|
char stack_buf[kMultiGetReadStackBufSize];
|
|
std::unique_ptr<char[]> block_buf;
|
|
{
|
|
MultiGetRange data_block_range(sst_file_range, sst_file_range.begin(),
|
|
sst_file_range.end());
|
|
std::vector<Cache::Handle*> cache_handles;
|
|
bool wait_for_cache_results = false;
|
|
|
|
CachableEntry<UncompressionDict> uncompression_dict;
|
|
Status uncompression_dict_status;
|
|
uncompression_dict_status.PermitUncheckedError();
|
|
bool uncompression_dict_inited = false;
|
|
size_t total_len = 0;
|
|
ReadOptions ro = read_options;
|
|
ro.read_tier = kBlockCacheTier;
|
|
|
|
for (auto miter = data_block_range.begin();
|
|
miter != data_block_range.end(); ++miter) {
|
|
const Slice& key = miter->ikey;
|
|
iiter->Seek(miter->ikey);
|
|
|
|
IndexValue v;
|
|
if (iiter->Valid()) {
|
|
v = iiter->value();
|
|
}
|
|
if (!iiter->Valid() ||
|
|
(!v.first_internal_key.empty() && !skip_filters &&
|
|
UserComparatorWrapper(rep_->internal_comparator.user_comparator())
|
|
.CompareWithoutTimestamp(
|
|
ExtractUserKey(key),
|
|
ExtractUserKey(v.first_internal_key)) < 0)) {
|
|
// The requested key falls between highest key in previous block and
|
|
// lowest key in current block.
|
|
if (!iiter->status().IsNotFound()) {
|
|
*(miter->s) = iiter->status();
|
|
}
|
|
data_block_range.SkipKey(miter);
|
|
sst_file_range.SkipKey(miter);
|
|
continue;
|
|
}
|
|
|
|
if (!uncompression_dict_inited && rep_->uncompression_dict_reader) {
|
|
uncompression_dict_status =
|
|
rep_->uncompression_dict_reader->GetOrReadUncompressionDictionary(
|
|
nullptr /* prefetch_buffer */, no_io,
|
|
sst_file_range.begin()->get_context, &lookup_context,
|
|
&uncompression_dict);
|
|
uncompression_dict_inited = true;
|
|
}
|
|
|
|
if (!uncompression_dict_status.ok()) {
|
|
assert(!uncompression_dict_status.IsNotFound());
|
|
*(miter->s) = uncompression_dict_status;
|
|
data_block_range.SkipKey(miter);
|
|
sst_file_range.SkipKey(miter);
|
|
continue;
|
|
}
|
|
|
|
statuses.emplace_back();
|
|
results.emplace_back();
|
|
if (v.handle.offset() == offset) {
|
|
// We're going to reuse the block for this key later on. No need to
|
|
// look it up now. Place a null handle
|
|
block_handles.emplace_back(BlockHandle::NullBlockHandle());
|
|
continue;
|
|
}
|
|
// Lookup the cache for the given data block referenced by an index
|
|
// iterator value (i.e BlockHandle). If it exists in the cache,
|
|
// initialize block to the contents of the data block.
|
|
offset = v.handle.offset();
|
|
BlockHandle handle = v.handle;
|
|
BlockCacheLookupContext lookup_data_block_context(
|
|
TableReaderCaller::kUserMultiGet);
|
|
const UncompressionDict& dict = uncompression_dict.GetValue()
|
|
? *uncompression_dict.GetValue()
|
|
: UncompressionDict::GetEmptyDict();
|
|
Status s = RetrieveBlock(
|
|
nullptr, ro, handle, dict, &(results.back()), BlockType::kData,
|
|
miter->get_context, &lookup_data_block_context,
|
|
/* for_compaction */ false, /* use_cache */ true,
|
|
/* wait_for_cache */ false);
|
|
if (s.IsIncomplete()) {
|
|
s = Status::OK();
|
|
}
|
|
if (s.ok() && !results.back().IsEmpty()) {
|
|
// Since we have a valid handle, check the value. If its nullptr,
|
|
// it means the cache is waiting for the final result and we're
|
|
// supposed to call WaitAll() to wait for the result.
|
|
if (results.back().GetValue() != nullptr) {
|
|
// Found it in the cache. Add NULL handle to indicate there is
|
|
// nothing to read from disk.
|
|
if (results.back().GetCacheHandle()) {
|
|
results.back().UpdateCachedValue();
|
|
}
|
|
block_handles.emplace_back(BlockHandle::NullBlockHandle());
|
|
} else {
|
|
// We have to wait for the cache lookup to finish in the
|
|
// background, and then we may have to read the block from disk
|
|
// anyway
|
|
assert(results.back().GetCacheHandle());
|
|
wait_for_cache_results = true;
|
|
block_handles.emplace_back(handle);
|
|
cache_handles.emplace_back(results.back().GetCacheHandle());
|
|
}
|
|
} else {
|
|
block_handles.emplace_back(handle);
|
|
total_len += block_size(handle);
|
|
}
|
|
}
|
|
|
|
if (wait_for_cache_results) {
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
block_cache->WaitAll(cache_handles);
|
|
for (size_t i = 0; i < block_handles.size(); ++i) {
|
|
// If this block was a success or failure or not needed because
|
|
// the corresponding key is in the same block as a prior key, skip
|
|
if (block_handles[i] == BlockHandle::NullBlockHandle() ||
|
|
results[i].IsEmpty()) {
|
|
continue;
|
|
}
|
|
results[i].UpdateCachedValue();
|
|
void* val = results[i].GetValue();
|
|
if (!val) {
|
|
// The async cache lookup failed - could be due to an error
|
|
// or a false positive. We need to read the data block from
|
|
// the SST file
|
|
results[i].Reset();
|
|
total_len += block_size(block_handles[i]);
|
|
} else {
|
|
block_handles[i] = BlockHandle::NullBlockHandle();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (total_len) {
|
|
char* scratch = nullptr;
|
|
const UncompressionDict& dict = uncompression_dict.GetValue()
|
|
? *uncompression_dict.GetValue()
|
|
: UncompressionDict::GetEmptyDict();
|
|
assert(uncompression_dict_inited || !rep_->uncompression_dict_reader);
|
|
assert(uncompression_dict_status.ok());
|
|
// If using direct IO, then scratch is not used, so keep it nullptr.
|
|
// If the blocks need to be uncompressed and we don't need the
|
|
// compressed blocks, then we can use a contiguous block of
|
|
// memory to read in all the blocks as it will be temporary
|
|
// storage
|
|
// 1. If blocks are compressed and compressed block cache is there,
|
|
// alloc heap bufs
|
|
// 2. If blocks are uncompressed, alloc heap bufs
|
|
// 3. If blocks are compressed and no compressed block cache, use
|
|
// stack buf
|
|
if (!rep_->file->use_direct_io() &&
|
|
rep_->table_options.block_cache_compressed == nullptr &&
|
|
rep_->blocks_maybe_compressed) {
|
|
if (total_len <= kMultiGetReadStackBufSize) {
|
|
scratch = stack_buf;
|
|
} else {
|
|
scratch = new char[total_len];
|
|
block_buf.reset(scratch);
|
|
}
|
|
}
|
|
RetrieveMultipleBlocks(read_options, &data_block_range, &block_handles,
|
|
&statuses, &results, scratch, dict);
|
|
if (sst_file_range.begin()->get_context) {
|
|
++(sst_file_range.begin()
|
|
->get_context->get_context_stats_.num_sst_read);
|
|
}
|
|
}
|
|
}
|
|
|
|
DataBlockIter first_biter;
|
|
DataBlockIter next_biter;
|
|
size_t idx_in_batch = 0;
|
|
for (auto miter = sst_file_range.begin(); miter != sst_file_range.end();
|
|
++miter) {
|
|
Status s;
|
|
GetContext* get_context = miter->get_context;
|
|
const Slice& key = miter->ikey;
|
|
bool matched = false; // if such user key matched a key in SST
|
|
bool done = false;
|
|
bool first_block = true;
|
|
do {
|
|
DataBlockIter* biter = nullptr;
|
|
bool reusing_block = true;
|
|
uint64_t referenced_data_size = 0;
|
|
bool does_referenced_key_exist = false;
|
|
BlockCacheLookupContext lookup_data_block_context(
|
|
TableReaderCaller::kUserMultiGet, tracing_mget_id,
|
|
/*get_from_user_specified_snapshot=*/read_options.snapshot !=
|
|
nullptr);
|
|
if (first_block) {
|
|
if (!block_handles[idx_in_batch].IsNull() ||
|
|
!results[idx_in_batch].IsEmpty()) {
|
|
first_biter.Invalidate(Status::OK());
|
|
NewDataBlockIterator<DataBlockIter>(
|
|
read_options, results[idx_in_batch], &first_biter,
|
|
statuses[idx_in_batch]);
|
|
reusing_block = false;
|
|
} else {
|
|
// If handler is null and result is empty, then the status is never
|
|
// set, which should be the initial value: ok().
|
|
assert(statuses[idx_in_batch].ok());
|
|
}
|
|
biter = &first_biter;
|
|
idx_in_batch++;
|
|
} else {
|
|
IndexValue v = iiter->value();
|
|
if (!v.first_internal_key.empty() && !skip_filters &&
|
|
UserComparatorWrapper(rep_->internal_comparator.user_comparator())
|
|
.CompareWithoutTimestamp(
|
|
ExtractUserKey(key),
|
|
ExtractUserKey(v.first_internal_key)) < 0) {
|
|
// The requested key falls between highest key in previous block and
|
|
// lowest key in current block.
|
|
break;
|
|
}
|
|
|
|
next_biter.Invalidate(Status::OK());
|
|
NewDataBlockIterator<DataBlockIter>(
|
|
read_options, iiter->value().handle, &next_biter,
|
|
BlockType::kData, get_context, &lookup_data_block_context,
|
|
Status(), nullptr);
|
|
biter = &next_biter;
|
|
reusing_block = false;
|
|
}
|
|
|
|
if (read_options.read_tier == kBlockCacheTier &&
|
|
biter->status().IsIncomplete()) {
|
|
// couldn't get block from block_cache
|
|
// Update Saver.state to Found because we are only looking for
|
|
// whether we can guarantee the key is not there when "no_io" is set
|
|
get_context->MarkKeyMayExist();
|
|
break;
|
|
}
|
|
if (!biter->status().ok()) {
|
|
s = biter->status();
|
|
break;
|
|
}
|
|
|
|
bool may_exist = biter->SeekForGet(key);
|
|
if (!may_exist) {
|
|
// HashSeek cannot find the key this block and the the iter is not
|
|
// the end of the block, i.e. cannot be in the following blocks
|
|
// either. In this case, the seek_key cannot be found, so we break
|
|
// from the top level for-loop.
|
|
break;
|
|
}
|
|
|
|
// Call the *saver function on each entry/block until it returns false
|
|
for (; biter->Valid(); biter->Next()) {
|
|
ParsedInternalKey parsed_key;
|
|
Cleanable dummy;
|
|
Cleanable* value_pinner = nullptr;
|
|
Status pik_status = ParseInternalKey(
|
|
biter->key(), &parsed_key, false /* log_err_key */); // TODO
|
|
if (!pik_status.ok()) {
|
|
s = pik_status;
|
|
}
|
|
if (biter->IsValuePinned()) {
|
|
if (reusing_block) {
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
assert(biter->cache_handle() != nullptr);
|
|
block_cache->Ref(biter->cache_handle());
|
|
dummy.RegisterCleanup(&ReleaseCachedEntry, block_cache,
|
|
biter->cache_handle());
|
|
value_pinner = &dummy;
|
|
} else {
|
|
value_pinner = biter;
|
|
}
|
|
}
|
|
if (!get_context->SaveValue(parsed_key, biter->value(), &matched,
|
|
value_pinner)) {
|
|
if (get_context->State() == GetContext::GetState::kFound) {
|
|
does_referenced_key_exist = true;
|
|
referenced_data_size =
|
|
biter->key().size() + biter->value().size();
|
|
}
|
|
done = true;
|
|
break;
|
|
}
|
|
s = biter->status();
|
|
}
|
|
// Write the block cache access.
|
|
if (block_cache_tracer_ && block_cache_tracer_->is_tracing_enabled()) {
|
|
// Avoid making copy of block_key, cf_name, and referenced_key when
|
|
// constructing the access record.
|
|
Slice referenced_key;
|
|
if (does_referenced_key_exist) {
|
|
referenced_key = biter->key();
|
|
} else {
|
|
referenced_key = key;
|
|
}
|
|
BlockCacheTraceRecord access_record(
|
|
rep_->ioptions.clock->NowMicros(),
|
|
/*block_key=*/"", lookup_data_block_context.block_type,
|
|
lookup_data_block_context.block_size, rep_->cf_id_for_tracing(),
|
|
/*cf_name=*/"", rep_->level_for_tracing(),
|
|
rep_->sst_number_for_tracing(), lookup_data_block_context.caller,
|
|
lookup_data_block_context.is_cache_hit,
|
|
lookup_data_block_context.no_insert,
|
|
lookup_data_block_context.get_id,
|
|
lookup_data_block_context.get_from_user_specified_snapshot,
|
|
/*referenced_key=*/"", referenced_data_size,
|
|
lookup_data_block_context.num_keys_in_block,
|
|
does_referenced_key_exist);
|
|
// TODO: Should handle status here?
|
|
block_cache_tracer_
|
|
->WriteBlockAccess(access_record,
|
|
lookup_data_block_context.block_key,
|
|
rep_->cf_name_for_tracing(), referenced_key)
|
|
.PermitUncheckedError();
|
|
}
|
|
s = biter->status();
|
|
if (done) {
|
|
// Avoid the extra Next which is expensive in two-level indexes
|
|
break;
|
|
}
|
|
if (first_block) {
|
|
iiter->Seek(key);
|
|
}
|
|
first_block = false;
|
|
iiter->Next();
|
|
} while (iiter->Valid());
|
|
|
|
if (matched && filter != nullptr && !filter->IsBlockBased()) {
|
|
RecordTick(rep_->ioptions.stats, BLOOM_FILTER_FULL_TRUE_POSITIVE);
|
|
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_true_positive, 1,
|
|
rep_->level);
|
|
}
|
|
if (s.ok() && !iiter->status().IsNotFound()) {
|
|
s = iiter->status();
|
|
}
|
|
*(miter->s) = s;
|
|
}
|
|
#ifdef ROCKSDB_ASSERT_STATUS_CHECKED
|
|
// Not sure why we need to do it. Should investigate more.
|
|
for (auto& st : statuses) {
|
|
st.PermitUncheckedError();
|
|
}
|
|
#endif // ROCKSDB_ASSERT_STATUS_CHECKED
|
|
}
|
|
}
|
|
|
|
Status BlockBasedTable::Prefetch(const Slice* const begin,
|
|
const Slice* const end) {
|
|
auto& comparator = rep_->internal_comparator;
|
|
UserComparatorWrapper user_comparator(comparator.user_comparator());
|
|
// pre-condition
|
|
if (begin && end && comparator.Compare(*begin, *end) > 0) {
|
|
return Status::InvalidArgument(*begin, *end);
|
|
}
|
|
BlockCacheLookupContext lookup_context{TableReaderCaller::kPrefetch};
|
|
IndexBlockIter iiter_on_stack;
|
|
auto iiter = NewIndexIterator(ReadOptions(), /*need_upper_bound_check=*/false,
|
|
&iiter_on_stack, /*get_context=*/nullptr,
|
|
&lookup_context);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr = std::unique_ptr<InternalIteratorBase<IndexValue>>(iiter);
|
|
}
|
|
|
|
if (!iiter->status().ok()) {
|
|
// error opening index iterator
|
|
return iiter->status();
|
|
}
|
|
|
|
// indicates if we are on the last page that need to be pre-fetched
|
|
bool prefetching_boundary_page = false;
|
|
|
|
for (begin ? iiter->Seek(*begin) : iiter->SeekToFirst(); iiter->Valid();
|
|
iiter->Next()) {
|
|
BlockHandle block_handle = iiter->value().handle;
|
|
const bool is_user_key = !rep_->index_key_includes_seq;
|
|
if (end &&
|
|
((!is_user_key && comparator.Compare(iiter->key(), *end) >= 0) ||
|
|
(is_user_key &&
|
|
user_comparator.Compare(iiter->key(), ExtractUserKey(*end)) >= 0))) {
|
|
if (prefetching_boundary_page) {
|
|
break;
|
|
}
|
|
|
|
// The index entry represents the last key in the data block.
|
|
// We should load this page into memory as well, but no more
|
|
prefetching_boundary_page = true;
|
|
}
|
|
|
|
// Load the block specified by the block_handle into the block cache
|
|
DataBlockIter biter;
|
|
|
|
NewDataBlockIterator<DataBlockIter>(
|
|
ReadOptions(), block_handle, &biter, /*type=*/BlockType::kData,
|
|
/*get_context=*/nullptr, &lookup_context, Status(),
|
|
/*prefetch_buffer=*/nullptr);
|
|
|
|
if (!biter.status().ok()) {
|
|
// there was an unexpected error while pre-fetching
|
|
return biter.status();
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::VerifyChecksum(const ReadOptions& read_options,
|
|
TableReaderCaller caller) {
|
|
Status s;
|
|
// Check Meta blocks
|
|
std::unique_ptr<Block> metaindex;
|
|
std::unique_ptr<InternalIterator> metaindex_iter;
|
|
ReadOptions ro;
|
|
s = ReadMetaIndexBlock(ro, nullptr /* prefetch buffer */, &metaindex,
|
|
&metaindex_iter);
|
|
if (s.ok()) {
|
|
s = VerifyChecksumInMetaBlocks(metaindex_iter.get());
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
} else {
|
|
return s;
|
|
}
|
|
// Check Data blocks
|
|
IndexBlockIter iiter_on_stack;
|
|
BlockCacheLookupContext context{caller};
|
|
InternalIteratorBase<IndexValue>* iiter = NewIndexIterator(
|
|
read_options, /*disable_prefix_seek=*/false, &iiter_on_stack,
|
|
/*get_context=*/nullptr, &context);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr = std::unique_ptr<InternalIteratorBase<IndexValue>>(iiter);
|
|
}
|
|
if (!iiter->status().ok()) {
|
|
// error opening index iterator
|
|
return iiter->status();
|
|
}
|
|
s = VerifyChecksumInBlocks(read_options, iiter);
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::VerifyChecksumInBlocks(
|
|
const ReadOptions& read_options,
|
|
InternalIteratorBase<IndexValue>* index_iter) {
|
|
Status s;
|
|
// We are scanning the whole file, so no need to do exponential
|
|
// increasing of the buffer size.
|
|
size_t readahead_size = (read_options.readahead_size != 0)
|
|
? read_options.readahead_size
|
|
: rep_->table_options.max_auto_readahead_size;
|
|
// FilePrefetchBuffer doesn't work in mmap mode and readahead is not
|
|
// needed there.
|
|
FilePrefetchBuffer prefetch_buffer(
|
|
rep_->file.get(), readahead_size /* readahead_size */,
|
|
readahead_size /* max_readahead_size */,
|
|
!rep_->ioptions.allow_mmap_reads /* enable */);
|
|
|
|
for (index_iter->SeekToFirst(); index_iter->Valid(); index_iter->Next()) {
|
|
s = index_iter->status();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
BlockHandle handle = index_iter->value().handle;
|
|
BlockContents contents;
|
|
BlockFetcher block_fetcher(
|
|
rep_->file.get(), &prefetch_buffer, rep_->footer, ReadOptions(), handle,
|
|
&contents, rep_->ioptions, false /* decompress */,
|
|
false /*maybe_compressed*/, BlockType::kData,
|
|
UncompressionDict::GetEmptyDict(), rep_->persistent_cache_options);
|
|
s = block_fetcher.ReadBlockContents();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
if (s.ok()) {
|
|
// In the case of two level indexes, we would have exited the above loop
|
|
// by checking index_iter->Valid(), but Valid() might have returned false
|
|
// due to an IO error. So check the index_iter status
|
|
s = index_iter->status();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
BlockType BlockBasedTable::GetBlockTypeForMetaBlockByName(
|
|
const Slice& meta_block_name) {
|
|
if (meta_block_name.starts_with(kFilterBlockPrefix) ||
|
|
meta_block_name.starts_with(kFullFilterBlockPrefix) ||
|
|
meta_block_name.starts_with(kPartitionedFilterBlockPrefix)) {
|
|
return BlockType::kFilter;
|
|
}
|
|
|
|
if (meta_block_name == kPropertiesBlock) {
|
|
return BlockType::kProperties;
|
|
}
|
|
|
|
if (meta_block_name == kCompressionDictBlock) {
|
|
return BlockType::kCompressionDictionary;
|
|
}
|
|
|
|
if (meta_block_name == kRangeDelBlock) {
|
|
return BlockType::kRangeDeletion;
|
|
}
|
|
|
|
if (meta_block_name == kHashIndexPrefixesBlock) {
|
|
return BlockType::kHashIndexPrefixes;
|
|
}
|
|
|
|
if (meta_block_name == kHashIndexPrefixesMetadataBlock) {
|
|
return BlockType::kHashIndexMetadata;
|
|
}
|
|
|
|
assert(false);
|
|
return BlockType::kInvalid;
|
|
}
|
|
|
|
Status BlockBasedTable::VerifyChecksumInMetaBlocks(
|
|
InternalIteratorBase<Slice>* index_iter) {
|
|
Status s;
|
|
for (index_iter->SeekToFirst(); index_iter->Valid(); index_iter->Next()) {
|
|
s = index_iter->status();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
BlockHandle handle;
|
|
Slice input = index_iter->value();
|
|
s = handle.DecodeFrom(&input);
|
|
BlockContents contents;
|
|
const Slice meta_block_name = index_iter->key();
|
|
BlockFetcher block_fetcher(
|
|
rep_->file.get(), nullptr /* prefetch buffer */, rep_->footer,
|
|
ReadOptions(), handle, &contents, rep_->ioptions,
|
|
false /* decompress */, false /*maybe_compressed*/,
|
|
GetBlockTypeForMetaBlockByName(meta_block_name),
|
|
UncompressionDict::GetEmptyDict(), rep_->persistent_cache_options);
|
|
s = block_fetcher.ReadBlockContents();
|
|
if (s.IsCorruption() && meta_block_name == kPropertiesBlock) {
|
|
TableProperties* table_properties;
|
|
ReadOptions ro;
|
|
s = TryReadPropertiesWithGlobalSeqno(ro, nullptr /* prefetch_buffer */,
|
|
index_iter->value(),
|
|
&table_properties);
|
|
delete table_properties;
|
|
}
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_BlockInCache(const BlockHandle& handle) const {
|
|
assert(rep_ != nullptr);
|
|
|
|
Cache* const cache = rep_->table_options.block_cache.get();
|
|
if (cache == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
char cache_key_storage[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
Slice cache_key =
|
|
GetCacheKey(rep_->cache_key_prefix, rep_->cache_key_prefix_size, handle,
|
|
cache_key_storage);
|
|
|
|
Cache::Handle* const cache_handle = cache->Lookup(cache_key);
|
|
if (cache_handle == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
cache->Release(cache_handle);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_KeyInCache(const ReadOptions& options,
|
|
const Slice& key) {
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter(NewIndexIterator(
|
|
options, /*need_upper_bound_check=*/false, /*input_iter=*/nullptr,
|
|
/*get_context=*/nullptr, /*lookup_context=*/nullptr));
|
|
iiter->Seek(key);
|
|
assert(iiter->Valid());
|
|
|
|
return TEST_BlockInCache(iiter->value().handle);
|
|
}
|
|
|
|
// REQUIRES: The following fields of rep_ should have already been populated:
|
|
// 1. file
|
|
// 2. index_handle,
|
|
// 3. options
|
|
// 4. internal_comparator
|
|
// 5. index_type
|
|
Status BlockBasedTable::CreateIndexReader(
|
|
const ReadOptions& ro, FilePrefetchBuffer* prefetch_buffer,
|
|
InternalIterator* preloaded_meta_index_iter, bool use_cache, bool prefetch,
|
|
bool pin, BlockCacheLookupContext* lookup_context,
|
|
std::unique_ptr<IndexReader>* index_reader) {
|
|
// kHashSearch requires non-empty prefix_extractor but bypass checking
|
|
// prefix_extractor here since we have no access to MutableCFOptions.
|
|
// Add need_upper_bound_check flag in BlockBasedTable::NewIndexIterator.
|
|
// If prefix_extractor does not match prefix_extractor_name from table
|
|
// properties, turn off Hash Index by setting total_order_seek to true
|
|
|
|
switch (rep_->index_type) {
|
|
case BlockBasedTableOptions::kTwoLevelIndexSearch: {
|
|
return PartitionIndexReader::Create(this, ro, prefetch_buffer, use_cache,
|
|
prefetch, pin, lookup_context,
|
|
index_reader);
|
|
}
|
|
case BlockBasedTableOptions::kBinarySearch:
|
|
FALLTHROUGH_INTENDED;
|
|
case BlockBasedTableOptions::kBinarySearchWithFirstKey: {
|
|
return BinarySearchIndexReader::Create(this, ro, prefetch_buffer,
|
|
use_cache, prefetch, pin,
|
|
lookup_context, index_reader);
|
|
}
|
|
case BlockBasedTableOptions::kHashSearch: {
|
|
std::unique_ptr<Block> metaindex_guard;
|
|
std::unique_ptr<InternalIterator> metaindex_iter_guard;
|
|
auto meta_index_iter = preloaded_meta_index_iter;
|
|
bool should_fallback = false;
|
|
if (rep_->internal_prefix_transform.get() == nullptr) {
|
|
ROCKS_LOG_WARN(rep_->ioptions.logger,
|
|
"No prefix extractor passed in. Fall back to binary"
|
|
" search index.");
|
|
should_fallback = true;
|
|
} else if (meta_index_iter == nullptr) {
|
|
auto s = ReadMetaIndexBlock(ro, prefetch_buffer, &metaindex_guard,
|
|
&metaindex_iter_guard);
|
|
if (!s.ok()) {
|
|
// we simply fall back to binary search in case there is any
|
|
// problem with prefix hash index loading.
|
|
ROCKS_LOG_WARN(rep_->ioptions.logger,
|
|
"Unable to read the metaindex block."
|
|
" Fall back to binary search index.");
|
|
should_fallback = true;
|
|
}
|
|
meta_index_iter = metaindex_iter_guard.get();
|
|
}
|
|
|
|
if (should_fallback) {
|
|
return BinarySearchIndexReader::Create(this, ro, prefetch_buffer,
|
|
use_cache, prefetch, pin,
|
|
lookup_context, index_reader);
|
|
} else {
|
|
return HashIndexReader::Create(this, ro, prefetch_buffer,
|
|
meta_index_iter, use_cache, prefetch,
|
|
pin, lookup_context, index_reader);
|
|
}
|
|
}
|
|
default: {
|
|
std::string error_message =
|
|
"Unrecognized index type: " + ToString(rep_->index_type);
|
|
return Status::InvalidArgument(error_message.c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
uint64_t BlockBasedTable::ApproximateDataOffsetOf(
|
|
const InternalIteratorBase<IndexValue>& index_iter,
|
|
uint64_t data_size) const {
|
|
if (index_iter.Valid()) {
|
|
BlockHandle handle = index_iter.value().handle;
|
|
return handle.offset();
|
|
} else {
|
|
// The iterator is past the last key in the file.
|
|
return data_size;
|
|
}
|
|
}
|
|
|
|
uint64_t BlockBasedTable::GetApproximateDataSize() {
|
|
// Should be in table properties unless super old version
|
|
if (rep_->table_properties) {
|
|
return rep_->table_properties->data_size;
|
|
}
|
|
// Fall back to rough estimate from footer
|
|
return rep_->footer.metaindex_handle().offset();
|
|
}
|
|
|
|
uint64_t BlockBasedTable::ApproximateOffsetOf(const Slice& key,
|
|
TableReaderCaller caller) {
|
|
uint64_t data_size = GetApproximateDataSize();
|
|
if (UNLIKELY(data_size == 0)) {
|
|
// Hmm. Let's just split in half to avoid skewing one way or another,
|
|
// since we don't know whether we're operating on lower bound or
|
|
// upper bound.
|
|
return rep_->file_size / 2;
|
|
}
|
|
|
|
BlockCacheLookupContext context(caller);
|
|
IndexBlockIter iiter_on_stack;
|
|
ReadOptions ro;
|
|
ro.total_order_seek = true;
|
|
auto index_iter =
|
|
NewIndexIterator(ro, /*disable_prefix_seek=*/true,
|
|
/*input_iter=*/&iiter_on_stack, /*get_context=*/nullptr,
|
|
/*lookup_context=*/&context);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter_unique_ptr;
|
|
if (index_iter != &iiter_on_stack) {
|
|
iiter_unique_ptr.reset(index_iter);
|
|
}
|
|
|
|
index_iter->Seek(key);
|
|
|
|
uint64_t offset = ApproximateDataOffsetOf(*index_iter, data_size);
|
|
// Pro-rate file metadata (incl filters) size-proportionally across data
|
|
// blocks.
|
|
double size_ratio =
|
|
static_cast<double>(offset) / static_cast<double>(data_size);
|
|
return static_cast<uint64_t>(size_ratio *
|
|
static_cast<double>(rep_->file_size));
|
|
}
|
|
|
|
uint64_t BlockBasedTable::ApproximateSize(const Slice& start, const Slice& end,
|
|
TableReaderCaller caller) {
|
|
assert(rep_->internal_comparator.Compare(start, end) <= 0);
|
|
|
|
uint64_t data_size = GetApproximateDataSize();
|
|
if (UNLIKELY(data_size == 0)) {
|
|
// Hmm. Assume whole file is involved, since we have lower and upper
|
|
// bound.
|
|
return rep_->file_size;
|
|
}
|
|
|
|
BlockCacheLookupContext context(caller);
|
|
IndexBlockIter iiter_on_stack;
|
|
ReadOptions ro;
|
|
ro.total_order_seek = true;
|
|
auto index_iter =
|
|
NewIndexIterator(ro, /*disable_prefix_seek=*/true,
|
|
/*input_iter=*/&iiter_on_stack, /*get_context=*/nullptr,
|
|
/*lookup_context=*/&context);
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> iiter_unique_ptr;
|
|
if (index_iter != &iiter_on_stack) {
|
|
iiter_unique_ptr.reset(index_iter);
|
|
}
|
|
|
|
index_iter->Seek(start);
|
|
uint64_t start_offset = ApproximateDataOffsetOf(*index_iter, data_size);
|
|
index_iter->Seek(end);
|
|
uint64_t end_offset = ApproximateDataOffsetOf(*index_iter, data_size);
|
|
|
|
assert(end_offset >= start_offset);
|
|
// Pro-rate file metadata (incl filters) size-proportionally across data
|
|
// blocks.
|
|
double size_ratio = static_cast<double>(end_offset - start_offset) /
|
|
static_cast<double>(data_size);
|
|
return static_cast<uint64_t>(size_ratio *
|
|
static_cast<double>(rep_->file_size));
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_FilterBlockInCache() const {
|
|
assert(rep_ != nullptr);
|
|
return TEST_BlockInCache(rep_->filter_handle);
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_IndexBlockInCache() const {
|
|
assert(rep_ != nullptr);
|
|
|
|
return TEST_BlockInCache(rep_->footer.index_handle());
|
|
}
|
|
|
|
Status BlockBasedTable::GetKVPairsFromDataBlocks(
|
|
std::vector<KVPairBlock>* kv_pair_blocks) {
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions(), /*need_upper_bound_check=*/false,
|
|
/*input_iter=*/nullptr, /*get_context=*/nullptr,
|
|
/*lookup_contex=*/nullptr));
|
|
|
|
Status s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
// Cannot read Index Block
|
|
return s;
|
|
}
|
|
|
|
for (blockhandles_iter->SeekToFirst(); blockhandles_iter->Valid();
|
|
blockhandles_iter->Next()) {
|
|
s = blockhandles_iter->status();
|
|
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
std::unique_ptr<InternalIterator> datablock_iter;
|
|
datablock_iter.reset(NewDataBlockIterator<DataBlockIter>(
|
|
ReadOptions(), blockhandles_iter->value().handle,
|
|
/*input_iter=*/nullptr, /*type=*/BlockType::kData,
|
|
/*get_context=*/nullptr, /*lookup_context=*/nullptr, Status(),
|
|
/*prefetch_buffer=*/nullptr));
|
|
s = datablock_iter->status();
|
|
|
|
if (!s.ok()) {
|
|
// Error reading the block - Skipped
|
|
continue;
|
|
}
|
|
|
|
KVPairBlock kv_pair_block;
|
|
for (datablock_iter->SeekToFirst(); datablock_iter->Valid();
|
|
datablock_iter->Next()) {
|
|
s = datablock_iter->status();
|
|
if (!s.ok()) {
|
|
// Error reading the block - Skipped
|
|
break;
|
|
}
|
|
const Slice& key = datablock_iter->key();
|
|
const Slice& value = datablock_iter->value();
|
|
std::string key_copy = std::string(key.data(), key.size());
|
|
std::string value_copy = std::string(value.data(), value.size());
|
|
|
|
kv_pair_block.push_back(
|
|
std::make_pair(std::move(key_copy), std::move(value_copy)));
|
|
}
|
|
kv_pair_blocks->push_back(std::move(kv_pair_block));
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::DumpTable(WritableFile* out_file) {
|
|
WritableFileStringStreamAdapter out_file_wrapper(out_file);
|
|
std::ostream out_stream(&out_file_wrapper);
|
|
// Output Footer
|
|
out_stream << "Footer Details:\n"
|
|
"--------------------------------------\n";
|
|
out_stream << " " << rep_->footer.ToString() << "\n";
|
|
|
|
// Output MetaIndex
|
|
out_stream << "Metaindex Details:\n"
|
|
"--------------------------------------\n";
|
|
std::unique_ptr<Block> metaindex;
|
|
std::unique_ptr<InternalIterator> metaindex_iter;
|
|
ReadOptions ro;
|
|
Status s = ReadMetaIndexBlock(ro, nullptr /* prefetch_buffer */, &metaindex,
|
|
&metaindex_iter);
|
|
if (s.ok()) {
|
|
for (metaindex_iter->SeekToFirst(); metaindex_iter->Valid();
|
|
metaindex_iter->Next()) {
|
|
s = metaindex_iter->status();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (metaindex_iter->key() == kPropertiesBlock) {
|
|
out_stream << " Properties block handle: "
|
|
<< metaindex_iter->value().ToString(true) << "\n";
|
|
} else if (metaindex_iter->key() == kCompressionDictBlock) {
|
|
out_stream << " Compression dictionary block handle: "
|
|
<< metaindex_iter->value().ToString(true) << "\n";
|
|
} else if (strstr(metaindex_iter->key().ToString().c_str(),
|
|
"filter.rocksdb.") != nullptr) {
|
|
out_stream << " Filter block handle: "
|
|
<< metaindex_iter->value().ToString(true) << "\n";
|
|
} else if (metaindex_iter->key() == kRangeDelBlock) {
|
|
out_stream << " Range deletion block handle: "
|
|
<< metaindex_iter->value().ToString(true) << "\n";
|
|
}
|
|
}
|
|
out_stream << "\n";
|
|
} else {
|
|
return s;
|
|
}
|
|
|
|
// Output TableProperties
|
|
const ROCKSDB_NAMESPACE::TableProperties* table_properties;
|
|
table_properties = rep_->table_properties.get();
|
|
|
|
if (table_properties != nullptr) {
|
|
out_stream << "Table Properties:\n"
|
|
"--------------------------------------\n";
|
|
out_stream << " " << table_properties->ToString("\n ", ": ") << "\n";
|
|
}
|
|
|
|
if (rep_->filter) {
|
|
out_stream << "Filter Details:\n"
|
|
"--------------------------------------\n";
|
|
out_stream << " " << rep_->filter->ToString() << "\n";
|
|
}
|
|
|
|
// Output Index block
|
|
s = DumpIndexBlock(out_stream);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// Output compression dictionary
|
|
if (rep_->uncompression_dict_reader) {
|
|
CachableEntry<UncompressionDict> uncompression_dict;
|
|
s = rep_->uncompression_dict_reader->GetOrReadUncompressionDictionary(
|
|
nullptr /* prefetch_buffer */, false /* no_io */,
|
|
nullptr /* get_context */, nullptr /* lookup_context */,
|
|
&uncompression_dict);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
assert(uncompression_dict.GetValue());
|
|
|
|
const Slice& raw_dict = uncompression_dict.GetValue()->GetRawDict();
|
|
out_stream << "Compression Dictionary:\n"
|
|
"--------------------------------------\n";
|
|
out_stream << " size (bytes): " << raw_dict.size() << "\n\n";
|
|
out_stream << " HEX " << raw_dict.ToString(true) << "\n\n";
|
|
}
|
|
|
|
// Output range deletions block
|
|
auto* range_del_iter = NewRangeTombstoneIterator(ReadOptions());
|
|
if (range_del_iter != nullptr) {
|
|
range_del_iter->SeekToFirst();
|
|
if (range_del_iter->Valid()) {
|
|
out_stream << "Range deletions:\n"
|
|
"--------------------------------------\n";
|
|
for (; range_del_iter->Valid(); range_del_iter->Next()) {
|
|
DumpKeyValue(range_del_iter->key(), range_del_iter->value(),
|
|
out_stream);
|
|
}
|
|
out_stream << "\n";
|
|
}
|
|
delete range_del_iter;
|
|
}
|
|
// Output Data blocks
|
|
s = DumpDataBlocks(out_stream);
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
if (!out_stream.good()) {
|
|
return Status::IOError("Failed to write to output file");
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::DumpIndexBlock(std::ostream& out_stream) {
|
|
out_stream << "Index Details:\n"
|
|
"--------------------------------------\n";
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions(), /*need_upper_bound_check=*/false,
|
|
/*input_iter=*/nullptr, /*get_context=*/nullptr,
|
|
/*lookup_contex=*/nullptr));
|
|
Status s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
out_stream << "Can not read Index Block \n\n";
|
|
return s;
|
|
}
|
|
|
|
out_stream << " Block key hex dump: Data block handle\n";
|
|
out_stream << " Block key ascii\n\n";
|
|
for (blockhandles_iter->SeekToFirst(); blockhandles_iter->Valid();
|
|
blockhandles_iter->Next()) {
|
|
s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
Slice key = blockhandles_iter->key();
|
|
Slice user_key;
|
|
InternalKey ikey;
|
|
if (!rep_->index_key_includes_seq) {
|
|
user_key = key;
|
|
} else {
|
|
ikey.DecodeFrom(key);
|
|
user_key = ikey.user_key();
|
|
}
|
|
|
|
out_stream << " HEX " << user_key.ToString(true) << ": "
|
|
<< blockhandles_iter->value().ToString(true,
|
|
rep_->index_has_first_key)
|
|
<< "\n";
|
|
|
|
std::string str_key = user_key.ToString();
|
|
std::string res_key("");
|
|
char cspace = ' ';
|
|
for (size_t i = 0; i < str_key.size(); i++) {
|
|
res_key.append(&str_key[i], 1);
|
|
res_key.append(1, cspace);
|
|
}
|
|
out_stream << " ASCII " << res_key << "\n";
|
|
out_stream << " ------\n";
|
|
}
|
|
out_stream << "\n";
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::DumpDataBlocks(std::ostream& out_stream) {
|
|
std::unique_ptr<InternalIteratorBase<IndexValue>> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions(), /*need_upper_bound_check=*/false,
|
|
/*input_iter=*/nullptr, /*get_context=*/nullptr,
|
|
/*lookup_contex=*/nullptr));
|
|
Status s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
out_stream << "Can not read Index Block \n\n";
|
|
return s;
|
|
}
|
|
|
|
uint64_t datablock_size_min = std::numeric_limits<uint64_t>::max();
|
|
uint64_t datablock_size_max = 0;
|
|
uint64_t datablock_size_sum = 0;
|
|
|
|
size_t block_id = 1;
|
|
for (blockhandles_iter->SeekToFirst(); blockhandles_iter->Valid();
|
|
block_id++, blockhandles_iter->Next()) {
|
|
s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
BlockHandle bh = blockhandles_iter->value().handle;
|
|
uint64_t datablock_size = bh.size();
|
|
datablock_size_min = std::min(datablock_size_min, datablock_size);
|
|
datablock_size_max = std::max(datablock_size_max, datablock_size);
|
|
datablock_size_sum += datablock_size;
|
|
|
|
out_stream << "Data Block # " << block_id << " @ "
|
|
<< blockhandles_iter->value().handle.ToString(true) << "\n";
|
|
out_stream << "--------------------------------------\n";
|
|
|
|
std::unique_ptr<InternalIterator> datablock_iter;
|
|
datablock_iter.reset(NewDataBlockIterator<DataBlockIter>(
|
|
ReadOptions(), blockhandles_iter->value().handle,
|
|
/*input_iter=*/nullptr, /*type=*/BlockType::kData,
|
|
/*get_context=*/nullptr, /*lookup_context=*/nullptr, Status(),
|
|
/*prefetch_buffer=*/nullptr));
|
|
s = datablock_iter->status();
|
|
|
|
if (!s.ok()) {
|
|
out_stream << "Error reading the block - Skipped \n\n";
|
|
continue;
|
|
}
|
|
|
|
for (datablock_iter->SeekToFirst(); datablock_iter->Valid();
|
|
datablock_iter->Next()) {
|
|
s = datablock_iter->status();
|
|
if (!s.ok()) {
|
|
out_stream << "Error reading the block - Skipped \n";
|
|
break;
|
|
}
|
|
DumpKeyValue(datablock_iter->key(), datablock_iter->value(), out_stream);
|
|
}
|
|
out_stream << "\n";
|
|
}
|
|
|
|
uint64_t num_datablocks = block_id - 1;
|
|
if (num_datablocks) {
|
|
double datablock_size_avg =
|
|
static_cast<double>(datablock_size_sum) / num_datablocks;
|
|
out_stream << "Data Block Summary:\n";
|
|
out_stream << "--------------------------------------\n";
|
|
out_stream << " # data blocks: " << num_datablocks << "\n";
|
|
out_stream << " min data block size: " << datablock_size_min << "\n";
|
|
out_stream << " max data block size: " << datablock_size_max << "\n";
|
|
out_stream << " avg data block size: " << ToString(datablock_size_avg)
|
|
<< "\n";
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
void BlockBasedTable::DumpKeyValue(const Slice& key, const Slice& value,
|
|
std::ostream& out_stream) {
|
|
InternalKey ikey;
|
|
ikey.DecodeFrom(key);
|
|
|
|
out_stream << " HEX " << ikey.user_key().ToString(true) << ": "
|
|
<< value.ToString(true) << "\n";
|
|
|
|
std::string str_key = ikey.user_key().ToString();
|
|
std::string str_value = value.ToString();
|
|
std::string res_key(""), res_value("");
|
|
char cspace = ' ';
|
|
for (size_t i = 0; i < str_key.size(); i++) {
|
|
if (str_key[i] == '\0') {
|
|
res_key.append("\\0", 2);
|
|
} else {
|
|
res_key.append(&str_key[i], 1);
|
|
}
|
|
res_key.append(1, cspace);
|
|
}
|
|
for (size_t i = 0; i < str_value.size(); i++) {
|
|
if (str_value[i] == '\0') {
|
|
res_value.append("\\0", 2);
|
|
} else {
|
|
res_value.append(&str_value[i], 1);
|
|
}
|
|
res_value.append(1, cspace);
|
|
}
|
|
|
|
out_stream << " ASCII " << res_key << ": " << res_value << "\n";
|
|
out_stream << " ------\n";
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|