mirror of https://github.com/facebook/rocksdb.git
3137 lines
118 KiB
C++
3137 lines
118 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_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 "db/dbformat.h"
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#include "db/pinned_iterators_manager.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/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/table.h"
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#include "rocksdb/table_properties.h"
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#include "table/block.h"
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#include "table/block_based_filter_block.h"
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#include "table/block_based_table_factory.h"
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#include "table/block_fetcher.h"
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#include "table/block_prefix_index.h"
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#include "table/filter_block.h"
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#include "table/format.h"
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#include "table/full_filter_block.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/partitioned_filter_block.h"
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#include "table/persistent_cache_helper.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 "monitoring/perf_context_imp.h"
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#include "util/coding.h"
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#include "util/file_reader_writer.h"
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#include "util/stop_watch.h"
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#include "util/string_util.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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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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using std::unique_ptr;
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typedef BlockBasedTable::IndexReader IndexReader;
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BlockBasedTable::~BlockBasedTable() {
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Close();
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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 compression_dict Data for presetting the compression library's
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// dictionary.
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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<Block>* result, const ImmutableCFOptions& ioptions,
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bool do_uncompress, const Slice& compression_dict,
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const PersistentCacheOptions& cache_options, SequenceNumber global_seqno,
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size_t read_amp_bytes_per_bit, const bool immortal_file = false) {
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BlockContents contents;
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BlockFetcher block_fetcher(file, prefetch_buffer, footer, options, handle,
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&contents, ioptions, do_uncompress,
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compression_dict, cache_options, immortal_file);
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Status s = block_fetcher.ReadBlockContents();
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if (s.ok()) {
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result->reset(new Block(std::move(contents), global_seqno,
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read_amp_bytes_per_bit, ioptions.statistics));
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}
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return s;
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}
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// Delete the resource that is held by the iterator.
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template <class ResourceType>
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void DeleteHeldResource(void* arg, void* /*ignored*/) {
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delete reinterpret_cast<ResourceType*>(arg);
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}
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// Delete the entry resided in the cache.
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template <class Entry>
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void DeleteCachedEntry(const Slice& /*key*/, void* value) {
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auto entry = reinterpret_cast<Entry*>(value);
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delete entry;
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}
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void DeleteCachedFilterEntry(const Slice& key, void* value);
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void DeleteCachedIndexEntry(const Slice& key, void* value);
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// Release the cached entry and decrement its ref count.
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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);
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}
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// Release the cached entry and decrement its ref count.
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void ForceReleaseCachedEntry(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, true /* force_erase */);
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}
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Slice GetCacheKeyFromOffset(const char* cache_key_prefix,
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size_t cache_key_prefix_size, uint64_t offset,
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char* cache_key) {
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assert(cache_key != nullptr);
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assert(cache_key_prefix_size != 0);
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assert(cache_key_prefix_size <= BlockBasedTable::kMaxCacheKeyPrefixSize);
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memcpy(cache_key, cache_key_prefix, cache_key_prefix_size);
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char* end = EncodeVarint64(cache_key + cache_key_prefix_size, offset);
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return Slice(cache_key, static_cast<size_t>(end - cache_key));
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}
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Cache::Handle* GetEntryFromCache(Cache* block_cache, const Slice& key,
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Tickers block_cache_miss_ticker,
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Tickers block_cache_hit_ticker,
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uint64_t* block_cache_miss_stats,
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uint64_t* block_cache_hit_stats,
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Statistics* statistics,
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GetContext* get_context) {
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auto cache_handle = block_cache->Lookup(key, statistics);
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if (cache_handle != nullptr) {
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PERF_COUNTER_ADD(block_cache_hit_count, 1);
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if (get_context != nullptr) {
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// overall cache hit
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get_context->get_context_stats_.num_cache_hit++;
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// total bytes read from cache
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get_context->get_context_stats_.num_cache_bytes_read +=
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block_cache->GetUsage(cache_handle);
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// block-type specific cache hit
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(*block_cache_hit_stats)++;
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} else {
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// overall cache hit
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RecordTick(statistics, BLOCK_CACHE_HIT);
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// total bytes read from cache
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RecordTick(statistics, BLOCK_CACHE_BYTES_READ,
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block_cache->GetUsage(cache_handle));
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RecordTick(statistics, block_cache_hit_ticker);
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}
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} else {
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if (get_context != nullptr) {
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// overall cache miss
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get_context->get_context_stats_.num_cache_miss++;
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// block-type specific cache miss
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(*block_cache_miss_stats)++;
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} else {
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RecordTick(statistics, BLOCK_CACHE_MISS);
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RecordTick(statistics, block_cache_miss_ticker);
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}
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}
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return cache_handle;
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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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} // namespace
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// Index that allows binary search lookup in a two-level index structure.
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class PartitionIndexReader : public IndexReader, public Cleanable {
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public:
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// Read the partition index from the file and create an instance for
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// `PartitionIndexReader`.
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// On success, index_reader will be populated; otherwise it will remain
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// unmodified.
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static Status Create(BlockBasedTable* table, RandomAccessFileReader* file,
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FilePrefetchBuffer* prefetch_buffer,
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const Footer& footer, const BlockHandle& index_handle,
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const ImmutableCFOptions& ioptions,
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const InternalKeyComparator* icomparator,
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IndexReader** index_reader,
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const PersistentCacheOptions& cache_options,
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const int level, const bool index_key_includes_seq,
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const bool index_value_is_full) {
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std::unique_ptr<Block> index_block;
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auto s = ReadBlockFromFile(
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file, prefetch_buffer, footer, ReadOptions(), index_handle,
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&index_block, ioptions, true /* decompress */,
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Slice() /*compression dict*/, cache_options,
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kDisableGlobalSequenceNumber, 0 /* read_amp_bytes_per_bit */);
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if (s.ok()) {
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*index_reader = new PartitionIndexReader(
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table, icomparator, std::move(index_block), ioptions.statistics,
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level, index_key_includes_seq, index_value_is_full);
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}
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return s;
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}
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// return a two-level iterator: first level is on the partition index
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virtual InternalIteratorBase<BlockHandle>* NewIterator(
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IndexBlockIter* /*iter*/ = nullptr, bool /*dont_care*/ = true,
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bool fill_cache = true) override {
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Statistics* kNullStats = nullptr;
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// Filters are already checked before seeking the index
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if (!partition_map_.empty()) {
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return NewTwoLevelIterator(
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new BlockBasedTable::PartitionedIndexIteratorState(
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table_, &partition_map_, index_key_includes_seq_,
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index_value_is_full_),
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index_block_->NewIterator<IndexBlockIter>(
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icomparator_, icomparator_->user_comparator(), nullptr,
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kNullStats, true, index_key_includes_seq_, index_value_is_full_));
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} else {
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auto ro = ReadOptions();
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ro.fill_cache = fill_cache;
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bool kIsIndex = true;
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return new BlockBasedTableIterator<IndexBlockIter, BlockHandle>(
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table_, ro, *icomparator_,
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index_block_->NewIterator<IndexBlockIter>(
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icomparator_, icomparator_->user_comparator(), nullptr,
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kNullStats, true, index_key_includes_seq_, index_value_is_full_),
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false, true, /* prefix_extractor */ nullptr, kIsIndex,
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index_key_includes_seq_, index_value_is_full_);
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}
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// TODO(myabandeh): Update TwoLevelIterator to be able to make use of
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// on-stack BlockIter while the state is on heap. Currentlly it assumes
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// the first level iter is always on heap and will attempt to delete it
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// in its destructor.
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}
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virtual void CacheDependencies(bool pin) override {
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// Before read partitions, prefetch them to avoid lots of IOs
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auto rep = table_->rep_;
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IndexBlockIter biter;
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BlockHandle handle;
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Statistics* kNullStats = nullptr;
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index_block_->NewIterator<IndexBlockIter>(
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icomparator_, icomparator_->user_comparator(), &biter, kNullStats, true,
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index_key_includes_seq_, index_value_is_full_);
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// Index partitions are assumed to be consecuitive. Prefetch them all.
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// Read the first block offset
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biter.SeekToFirst();
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if (!biter.Valid()) {
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// Empty index.
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return;
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}
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handle = biter.value();
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uint64_t prefetch_off = handle.offset();
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// Read the last block's offset
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biter.SeekToLast();
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if (!biter.Valid()) {
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// Empty index.
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return;
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}
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handle = biter.value();
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uint64_t last_off = handle.offset() + handle.size() + kBlockTrailerSize;
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uint64_t prefetch_len = last_off - prefetch_off;
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std::unique_ptr<FilePrefetchBuffer> prefetch_buffer;
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auto& file = table_->rep_->file;
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prefetch_buffer.reset(new FilePrefetchBuffer());
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Status s = prefetch_buffer->Prefetch(file.get(), prefetch_off,
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static_cast<size_t>(prefetch_len));
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// After prefetch, read the partitions one by one
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biter.SeekToFirst();
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auto ro = ReadOptions();
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Cache* block_cache = rep->table_options.block_cache.get();
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for (; biter.Valid(); biter.Next()) {
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handle = biter.value();
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BlockBasedTable::CachableEntry<Block> block;
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Slice compression_dict;
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if (rep->compression_dict_block) {
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compression_dict = rep->compression_dict_block->data;
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}
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const bool is_index = true;
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// TODO: Support counter batch update for partitioned index and
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// filter blocks
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s = table_->MaybeLoadDataBlockToCache(
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prefetch_buffer.get(), rep, ro, handle, compression_dict, &block,
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is_index, nullptr /* get_context */);
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assert(s.ok() || block.value == nullptr);
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if (s.ok() && block.value != nullptr) {
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if (block.cache_handle != nullptr) {
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if (pin) {
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partition_map_[handle.offset()] = block;
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RegisterCleanup(&ReleaseCachedEntry, block_cache,
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block.cache_handle);
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} else {
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block_cache->Release(block.cache_handle);
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}
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} else {
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delete block.value;
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}
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}
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}
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}
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virtual size_t size() const override { return index_block_->size(); }
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virtual size_t usable_size() const override {
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return index_block_->usable_size();
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}
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virtual size_t ApproximateMemoryUsage() const override {
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assert(index_block_);
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size_t usage = index_block_->ApproximateMemoryUsage();
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#ifdef ROCKSDB_MALLOC_USABLE_SIZE
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usage += malloc_usable_size((void*)this);
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#else
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usage += sizeof(*this);
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#endif // ROCKSDB_MALLOC_USABLE_SIZE
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// TODO(myabandeh): more accurate estimate of partition_map_ mem usage
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return usage;
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}
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private:
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PartitionIndexReader(BlockBasedTable* table,
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const InternalKeyComparator* icomparator,
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std::unique_ptr<Block>&& index_block, Statistics* stats,
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const int /*level*/, const bool index_key_includes_seq,
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const bool index_value_is_full)
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: IndexReader(icomparator, stats),
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table_(table),
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index_block_(std::move(index_block)),
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index_key_includes_seq_(index_key_includes_seq),
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index_value_is_full_(index_value_is_full) {
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assert(index_block_ != nullptr);
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}
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BlockBasedTable* table_;
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std::unique_ptr<Block> index_block_;
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std::unordered_map<uint64_t, BlockBasedTable::CachableEntry<Block>>
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partition_map_;
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const bool index_key_includes_seq_;
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const bool index_value_is_full_;
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};
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// Index that allows binary search lookup for the first key of each block.
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// This class can be viewed as a thin wrapper for `Block` class which already
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// supports binary search.
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class BinarySearchIndexReader : public IndexReader {
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public:
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// Read index from the file and create an intance for
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// `BinarySearchIndexReader`.
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// On success, index_reader will be populated; otherwise it will remain
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// unmodified.
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static Status Create(RandomAccessFileReader* file,
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FilePrefetchBuffer* prefetch_buffer,
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const Footer& footer, const BlockHandle& index_handle,
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const ImmutableCFOptions& ioptions,
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const InternalKeyComparator* icomparator,
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IndexReader** index_reader,
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const PersistentCacheOptions& cache_options,
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const bool index_key_includes_seq,
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const bool index_value_is_full) {
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std::unique_ptr<Block> index_block;
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auto s = ReadBlockFromFile(
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file, prefetch_buffer, footer, ReadOptions(), index_handle,
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&index_block, ioptions, true /* decompress */,
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Slice() /*compression dict*/, cache_options,
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kDisableGlobalSequenceNumber, 0 /* read_amp_bytes_per_bit */);
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if (s.ok()) {
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*index_reader = new BinarySearchIndexReader(
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icomparator, std::move(index_block), ioptions.statistics,
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index_key_includes_seq, index_value_is_full);
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}
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return s;
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}
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virtual InternalIteratorBase<BlockHandle>* NewIterator(
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IndexBlockIter* iter = nullptr, bool /*dont_care*/ = true,
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bool /*dont_care*/ = true) override {
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Statistics* kNullStats = nullptr;
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return index_block_->NewIterator<IndexBlockIter>(
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icomparator_, icomparator_->user_comparator(), iter, kNullStats, true,
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index_key_includes_seq_, index_value_is_full_);
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}
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virtual size_t size() const override { return index_block_->size(); }
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virtual size_t usable_size() const override {
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return index_block_->usable_size();
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}
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virtual size_t ApproximateMemoryUsage() const override {
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assert(index_block_);
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size_t usage = index_block_->ApproximateMemoryUsage();
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#ifdef ROCKSDB_MALLOC_USABLE_SIZE
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usage += malloc_usable_size((void*)this);
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#else
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usage += sizeof(*this);
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#endif // ROCKSDB_MALLOC_USABLE_SIZE
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return usage;
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}
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private:
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BinarySearchIndexReader(const InternalKeyComparator* icomparator,
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std::unique_ptr<Block>&& index_block,
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Statistics* stats, const bool index_key_includes_seq,
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const bool index_value_is_full)
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: IndexReader(icomparator, stats),
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index_block_(std::move(index_block)),
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index_key_includes_seq_(index_key_includes_seq),
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index_value_is_full_(index_value_is_full) {
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assert(index_block_ != nullptr);
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}
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std::unique_ptr<Block> index_block_;
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const bool index_key_includes_seq_;
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const bool index_value_is_full_;
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};
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// Index that leverages an internal hash table to quicken the lookup for a given
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// key.
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class HashIndexReader : public IndexReader {
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public:
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static Status Create(
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const SliceTransform* hash_key_extractor, const Footer& footer,
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RandomAccessFileReader* file, FilePrefetchBuffer* prefetch_buffer,
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const ImmutableCFOptions& ioptions,
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const InternalKeyComparator* icomparator, const BlockHandle& index_handle,
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InternalIterator* meta_index_iter, IndexReader** index_reader,
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bool /*hash_index_allow_collision*/,
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const PersistentCacheOptions& cache_options,
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const bool index_key_includes_seq, const bool index_value_is_full) {
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std::unique_ptr<Block> index_block;
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auto s = ReadBlockFromFile(
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file, prefetch_buffer, footer, ReadOptions(), index_handle,
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&index_block, ioptions, true /* decompress */,
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Slice() /*compression dict*/, cache_options,
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kDisableGlobalSequenceNumber, 0 /* read_amp_bytes_per_bit */);
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|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// Note, failure to create prefix hash index does not need to be a
|
|
// hard error. We can still fall back to the original binary search index.
|
|
// So, Create will succeed regardless, from this point on.
|
|
|
|
auto new_index_reader = new HashIndexReader(
|
|
icomparator, std::move(index_block), ioptions.statistics,
|
|
index_key_includes_seq, index_value_is_full);
|
|
*index_reader = new_index_reader;
|
|
|
|
// Get prefixes block
|
|
BlockHandle prefixes_handle;
|
|
s = FindMetaBlock(meta_index_iter, kHashIndexPrefixesBlock,
|
|
&prefixes_handle);
|
|
if (!s.ok()) {
|
|
// TODO: log error
|
|
return Status::OK();
|
|
}
|
|
|
|
// Get index metadata block
|
|
BlockHandle prefixes_meta_handle;
|
|
s = FindMetaBlock(meta_index_iter, kHashIndexPrefixesMetadataBlock,
|
|
&prefixes_meta_handle);
|
|
if (!s.ok()) {
|
|
// TODO: log error
|
|
return Status::OK();
|
|
}
|
|
|
|
Slice dummy_comp_dict;
|
|
// Read contents for the blocks
|
|
BlockContents prefixes_contents;
|
|
BlockFetcher prefixes_block_fetcher(
|
|
file, prefetch_buffer, footer, ReadOptions(), prefixes_handle,
|
|
&prefixes_contents, ioptions, true /* decompress */,
|
|
dummy_comp_dict /*compression dict*/, cache_options);
|
|
s = prefixes_block_fetcher.ReadBlockContents();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
BlockContents prefixes_meta_contents;
|
|
BlockFetcher prefixes_meta_block_fetcher(
|
|
file, prefetch_buffer, footer, ReadOptions(), prefixes_meta_handle,
|
|
&prefixes_meta_contents, ioptions, true /* decompress */,
|
|
dummy_comp_dict /*compression dict*/, cache_options);
|
|
s = prefixes_meta_block_fetcher.ReadBlockContents();
|
|
if (!s.ok()) {
|
|
// TODO: log error
|
|
return Status::OK();
|
|
}
|
|
|
|
BlockPrefixIndex* prefix_index = nullptr;
|
|
s = BlockPrefixIndex::Create(hash_key_extractor, prefixes_contents.data,
|
|
prefixes_meta_contents.data, &prefix_index);
|
|
// TODO: log error
|
|
if (s.ok()) {
|
|
new_index_reader->prefix_index_.reset(prefix_index);
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
virtual InternalIteratorBase<BlockHandle>* NewIterator(
|
|
IndexBlockIter* iter = nullptr, bool total_order_seek = true,
|
|
bool /*dont_care*/ = true) override {
|
|
Statistics* kNullStats = nullptr;
|
|
return index_block_->NewIterator<IndexBlockIter>(
|
|
icomparator_, icomparator_->user_comparator(), iter, kNullStats,
|
|
total_order_seek, index_key_includes_seq_, index_value_is_full_,
|
|
prefix_index_.get());
|
|
}
|
|
|
|
virtual size_t size() const override { return index_block_->size(); }
|
|
virtual size_t usable_size() const override {
|
|
return index_block_->usable_size();
|
|
}
|
|
|
|
virtual size_t ApproximateMemoryUsage() const override {
|
|
assert(index_block_);
|
|
size_t usage = index_block_->ApproximateMemoryUsage();
|
|
usage += prefixes_contents_.usable_size();
|
|
#ifdef ROCKSDB_MALLOC_USABLE_SIZE
|
|
usage += malloc_usable_size((void*)this);
|
|
#else
|
|
if (prefix_index_) {
|
|
usage += prefix_index_->ApproximateMemoryUsage();
|
|
}
|
|
usage += sizeof(*this);
|
|
#endif // ROCKSDB_MALLOC_USABLE_SIZE
|
|
return usage;
|
|
}
|
|
|
|
private:
|
|
HashIndexReader(const InternalKeyComparator* icomparator,
|
|
std::unique_ptr<Block>&& index_block, Statistics* stats,
|
|
const bool index_key_includes_seq,
|
|
const bool index_value_is_full)
|
|
: IndexReader(icomparator, stats),
|
|
index_block_(std::move(index_block)),
|
|
index_key_includes_seq_(index_key_includes_seq),
|
|
index_value_is_full_(index_value_is_full) {
|
|
assert(index_block_ != nullptr);
|
|
}
|
|
|
|
~HashIndexReader() {
|
|
}
|
|
|
|
std::unique_ptr<Block> index_block_;
|
|
std::unique_ptr<BlockPrefixIndex> prefix_index_;
|
|
BlockContents prefixes_contents_;
|
|
const bool index_key_includes_seq_;
|
|
const bool index_value_is_full_;
|
|
};
|
|
|
|
// Helper function to setup the cache key's prefix for the Table.
|
|
void BlockBasedTable::SetupCacheKeyPrefix(Rep* rep, uint64_t file_size) {
|
|
assert(kMaxCacheKeyPrefixSize >= 10);
|
|
rep->cache_key_prefix_size = 0;
|
|
rep->compressed_cache_key_prefix_size = 0;
|
|
if (rep->table_options.block_cache != nullptr) {
|
|
GenerateCachePrefix(rep->table_options.block_cache.get(), rep->file->file(),
|
|
&rep->cache_key_prefix[0], &rep->cache_key_prefix_size);
|
|
// Create dummy offset of index reader which is beyond the file size.
|
|
rep->dummy_index_reader_offset =
|
|
file_size + rep->table_options.block_cache->NewId();
|
|
}
|
|
if (rep->table_options.persistent_cache != nullptr) {
|
|
GenerateCachePrefix(/*cache=*/nullptr, rep->file->file(),
|
|
&rep->persistent_cache_key_prefix[0],
|
|
&rep->persistent_cache_key_prefix_size);
|
|
}
|
|
if (rep->table_options.block_cache_compressed != nullptr) {
|
|
GenerateCachePrefix(rep->table_options.block_cache_compressed.get(),
|
|
rep->file->file(), &rep->compressed_cache_key_prefix[0],
|
|
&rep->compressed_cache_key_prefix_size);
|
|
}
|
|
}
|
|
|
|
void BlockBasedTable::GenerateCachePrefix(Cache* cc,
|
|
RandomAccessFile* file, char* buffer, size_t* size) {
|
|
|
|
// generate an id from the file
|
|
*size = file->GetUniqueId(buffer, kMaxCacheKeyPrefixSize);
|
|
|
|
// If the prefix wasn't generated or was too long,
|
|
// create one from the cache.
|
|
if (cc && *size == 0) {
|
|
char* end = EncodeVarint64(buffer, cc->NewId());
|
|
*size = static_cast<size_t>(end - buffer);
|
|
}
|
|
}
|
|
|
|
void BlockBasedTable::GenerateCachePrefix(Cache* cc,
|
|
WritableFile* file, char* buffer, size_t* size) {
|
|
|
|
// generate an id from the file
|
|
*size = file->GetUniqueId(buffer, kMaxCacheKeyPrefixSize);
|
|
|
|
// If the prefix wasn't generated or was too long,
|
|
// create one from the cache.
|
|
if (*size == 0) {
|
|
char* end = EncodeVarint64(buffer, cc->NewId());
|
|
*size = static_cast<size_t>(end - buffer);
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
// Return True if table_properties has `user_prop_name` has a `true` value
|
|
// or it doesn't contain this property (for backward compatible).
|
|
bool IsFeatureSupported(const TableProperties& table_properties,
|
|
const std::string& user_prop_name, Logger* info_log) {
|
|
auto& props = table_properties.user_collected_properties;
|
|
auto pos = props.find(user_prop_name);
|
|
// Older version doesn't have this value set. Skip this check.
|
|
if (pos != props.end()) {
|
|
if (pos->second == kPropFalse) {
|
|
return false;
|
|
} else if (pos->second != kPropTrue) {
|
|
ROCKS_LOG_WARN(info_log, "Property %s has invalidate value %s",
|
|
user_prop_name.c_str(), pos->second.c_str());
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Caller has to ensure seqno is not nullptr.
|
|
Status GetGlobalSequenceNumber(const TableProperties& table_properties,
|
|
SequenceNumber largest_seqno,
|
|
SequenceNumber* seqno) {
|
|
const auto& props = table_properties.user_collected_properties;
|
|
const auto version_pos = props.find(ExternalSstFilePropertyNames::kVersion);
|
|
const auto seqno_pos = props.find(ExternalSstFilePropertyNames::kGlobalSeqno);
|
|
|
|
*seqno = kDisableGlobalSequenceNumber;
|
|
if (version_pos == props.end()) {
|
|
if (seqno_pos != props.end()) {
|
|
std::array<char, 200> msg_buf;
|
|
// This is not an external sst file, global_seqno is not supported.
|
|
snprintf(
|
|
msg_buf.data(), msg_buf.max_size(),
|
|
"A non-external sst file have global seqno property with value %s",
|
|
seqno_pos->second.c_str());
|
|
return Status::Corruption(msg_buf.data());
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
uint32_t version = DecodeFixed32(version_pos->second.c_str());
|
|
if (version < 2) {
|
|
if (seqno_pos != props.end() || version != 1) {
|
|
std::array<char, 200> msg_buf;
|
|
// This is a v1 external sst file, global_seqno is not supported.
|
|
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());
|
|
}
|
|
if (global_seqno != 0 && 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());
|
|
}
|
|
global_seqno = largest_seqno;
|
|
*seqno = largest_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 ImmutableCFOptions& ioptions,
|
|
const EnvOptions& env_options,
|
|
const BlockBasedTableOptions& table_options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
unique_ptr<RandomAccessFileReader>&& file,
|
|
uint64_t file_size,
|
|
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,
|
|
TailPrefetchStats* tail_prefetch_stats) {
|
|
table_reader->reset();
|
|
|
|
Footer footer;
|
|
|
|
std::unique_ptr<FilePrefetchBuffer> prefetch_buffer;
|
|
|
|
// 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;
|
|
|
|
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);
|
|
Status s;
|
|
// TODO should not have this special logic in the future.
|
|
if (!file->use_direct_io()) {
|
|
prefetch_buffer.reset(new FilePrefetchBuffer(nullptr, 0, 0, false, true));
|
|
s = file->Prefetch(prefetch_off, prefetch_len);
|
|
} else {
|
|
prefetch_buffer.reset(new FilePrefetchBuffer(nullptr, 0, 0, true, true));
|
|
s = prefetch_buffer->Prefetch(file.get(), prefetch_off, prefetch_len);
|
|
}
|
|
s = ReadFooterFromFile(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.
|
|
Rep* rep = new BlockBasedTable::Rep(ioptions, env_options, table_options,
|
|
internal_comparator, skip_filters,
|
|
immortal_table);
|
|
rep->file = std::move(file);
|
|
rep->footer = footer;
|
|
rep->index_type = table_options.index_type;
|
|
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.
|
|
rep->internal_prefix_transform.reset(
|
|
new InternalKeySliceTransform(prefix_extractor));
|
|
SetupCacheKeyPrefix(rep, file_size);
|
|
unique_ptr<BlockBasedTable> new_table(new BlockBasedTable(rep));
|
|
|
|
// page cache options
|
|
rep->persistent_cache_options =
|
|
PersistentCacheOptions(rep->table_options.persistent_cache,
|
|
std::string(rep->persistent_cache_key_prefix,
|
|
rep->persistent_cache_key_prefix_size),
|
|
rep->ioptions.statistics);
|
|
|
|
// Read meta index
|
|
std::unique_ptr<Block> meta;
|
|
std::unique_ptr<InternalIterator> meta_iter;
|
|
s = ReadMetaBlock(rep, prefetch_buffer.get(), &meta, &meta_iter);
|
|
if (!s.ok()) {
|
|
return 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.get(), filter_block_key, &rep->filter_handle)
|
|
.ok()) {
|
|
rep->filter_type = filter_type;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read the properties
|
|
bool found_properties_block = true;
|
|
s = SeekToPropertiesBlock(meta_iter.get(), &found_properties_block);
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(rep->ioptions.info_log,
|
|
"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(meta_iter->value(), rep->file.get(),
|
|
prefetch_buffer.get(), rep->footer, rep->ioptions,
|
|
&table_properties, false /* compression_type_missing */);
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(rep->ioptions.info_log,
|
|
"Encountered error while reading data from properties "
|
|
"block %s",
|
|
s.ToString().c_str());
|
|
} else {
|
|
assert(table_properties != nullptr);
|
|
rep->table_properties.reset(table_properties);
|
|
rep->blocks_maybe_compressed = rep->table_properties->compression_name !=
|
|
CompressionTypeToString(kNoCompression);
|
|
}
|
|
} else {
|
|
ROCKS_LOG_ERROR(rep->ioptions.info_log,
|
|
"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 compression dictionary meta block
|
|
bool found_compression_dict;
|
|
BlockHandle compression_dict_handle;
|
|
s = SeekToCompressionDictBlock(meta_iter.get(), &found_compression_dict,
|
|
&compression_dict_handle);
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
rep->ioptions.info_log,
|
|
"Error when seeking to compression dictionary block from file: %s",
|
|
s.ToString().c_str());
|
|
} else if (found_compression_dict && !compression_dict_handle.IsNull()) {
|
|
// TODO(andrewkr): Add to block cache if cache_index_and_filter_blocks is
|
|
// true.
|
|
std::unique_ptr<BlockContents> compression_dict_cont{new BlockContents()};
|
|
PersistentCacheOptions cache_options;
|
|
ReadOptions read_options;
|
|
read_options.verify_checksums = false;
|
|
BlockFetcher compression_block_fetcher(
|
|
rep->file.get(), prefetch_buffer.get(), rep->footer, read_options,
|
|
compression_dict_handle, compression_dict_cont.get(), rep->ioptions, false /* decompress */,
|
|
Slice() /*compression dict*/, cache_options);
|
|
s = compression_block_fetcher.ReadBlockContents();
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
rep->ioptions.info_log,
|
|
"Encountered error while reading data from compression dictionary "
|
|
"block %s",
|
|
s.ToString().c_str());
|
|
} else {
|
|
rep->compression_dict_block = std::move(compression_dict_cont);
|
|
}
|
|
}
|
|
|
|
// Read the table properties, if provided.
|
|
if (rep->table_properties) {
|
|
rep->whole_key_filtering &=
|
|
IsFeatureSupported(*(rep->table_properties),
|
|
BlockBasedTablePropertyNames::kWholeKeyFiltering,
|
|
rep->ioptions.info_log);
|
|
rep->prefix_filtering &= IsFeatureSupported(
|
|
*(rep->table_properties),
|
|
BlockBasedTablePropertyNames::kPrefixFiltering, rep->ioptions.info_log);
|
|
|
|
s = GetGlobalSequenceNumber(*(rep->table_properties), largest_seqno,
|
|
&(rep->global_seqno));
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_ERROR(rep->ioptions.info_log, "%s", s.ToString().c_str());
|
|
return s;
|
|
}
|
|
}
|
|
|
|
// Read the range del meta block
|
|
bool found_range_del_block;
|
|
s = SeekToRangeDelBlock(meta_iter.get(), &found_range_del_block,
|
|
&rep->range_del_handle);
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
rep->ioptions.info_log,
|
|
"Error when seeking to range delete tombstones block from file: %s",
|
|
s.ToString().c_str());
|
|
} else {
|
|
if (found_range_del_block && !rep->range_del_handle.IsNull()) {
|
|
ReadOptions read_options;
|
|
s = MaybeLoadDataBlockToCache(
|
|
prefetch_buffer.get(), rep, read_options, rep->range_del_handle,
|
|
Slice() /* compression_dict */, &rep->range_del_entry,
|
|
false /* is_index */, nullptr /* get_context */);
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
rep->ioptions.info_log,
|
|
"Encountered error while reading data from range del block %s",
|
|
s.ToString().c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
bool need_upper_bound_check =
|
|
PrefixExtractorChanged(rep->table_properties.get(), prefix_extractor);
|
|
|
|
BlockBasedTableOptions::IndexType index_type = new_table->UpdateIndexType();
|
|
// prefetch the first level of index
|
|
const bool prefetch_index =
|
|
prefetch_all ||
|
|
(table_options.pin_top_level_index_and_filter &&
|
|
index_type == BlockBasedTableOptions::kTwoLevelIndexSearch);
|
|
// prefetch the first level of filter
|
|
const bool prefetch_filter =
|
|
prefetch_all || (table_options.pin_top_level_index_and_filter &&
|
|
rep->filter_type == Rep::FilterType::kPartitionedFilter);
|
|
// Partition fitlers cannot be enabled without partition indexes
|
|
assert(!prefetch_filter || prefetch_index);
|
|
// pin both index and filters, down to all partitions
|
|
const bool pin_all =
|
|
rep->table_options.pin_l0_filter_and_index_blocks_in_cache && level == 0;
|
|
// pin the first level of index
|
|
const bool pin_index =
|
|
pin_all || (table_options.pin_top_level_index_and_filter &&
|
|
index_type == BlockBasedTableOptions::kTwoLevelIndexSearch);
|
|
// pin the first level of filter
|
|
const bool pin_filter =
|
|
pin_all || (table_options.pin_top_level_index_and_filter &&
|
|
rep->filter_type == Rep::FilterType::kPartitionedFilter);
|
|
// pre-fetching of blocks is turned on
|
|
// Will use block cache for index/filter blocks access
|
|
// Always prefetch index and filter for level 0
|
|
if (table_options.cache_index_and_filter_blocks) {
|
|
assert(table_options.block_cache != nullptr);
|
|
if (prefetch_index) {
|
|
// Hack: Call NewIndexIterator() to implicitly add index to the
|
|
// block_cache
|
|
CachableEntry<IndexReader> index_entry;
|
|
// check prefix_extractor match only if hash based index is used
|
|
bool disable_prefix_seek =
|
|
rep->index_type == BlockBasedTableOptions::kHashSearch &&
|
|
need_upper_bound_check;
|
|
unique_ptr<InternalIteratorBase<BlockHandle>> iter(
|
|
new_table->NewIndexIterator(ReadOptions(), disable_prefix_seek,
|
|
nullptr, &index_entry));
|
|
s = iter->status();
|
|
if (s.ok()) {
|
|
// This is the first call to NewIndexIterator() since we're in Open().
|
|
// On success it should give us ownership of the `CachableEntry` by
|
|
// populating `index_entry`.
|
|
assert(index_entry.value != nullptr);
|
|
if (prefetch_all) {
|
|
index_entry.value->CacheDependencies(pin_all);
|
|
}
|
|
if (pin_index) {
|
|
rep->index_entry = std::move(index_entry);
|
|
} else {
|
|
index_entry.Release(table_options.block_cache.get());
|
|
}
|
|
}
|
|
}
|
|
if (s.ok() && prefetch_filter) {
|
|
// Hack: Call GetFilter() to implicitly add filter to the block_cache
|
|
auto filter_entry =
|
|
new_table->GetFilter(rep->table_prefix_extractor.get());
|
|
if (filter_entry.value != nullptr && prefetch_all) {
|
|
filter_entry.value->CacheDependencies(
|
|
pin_all, rep->table_prefix_extractor.get());
|
|
}
|
|
// if pin_filter is true then save it in rep_->filter_entry; it will be
|
|
// released in the destructor only, hence it will be pinned in the
|
|
// cache while this reader is alive
|
|
if (pin_filter) {
|
|
rep->filter_entry = filter_entry;
|
|
} else {
|
|
filter_entry.Release(table_options.block_cache.get());
|
|
}
|
|
}
|
|
} else {
|
|
// If we don't use block cache for index/filter blocks access, we'll
|
|
// pre-load these blocks, which will kept in member variables in Rep
|
|
// and with a same life-time as this table object.
|
|
IndexReader* index_reader = nullptr;
|
|
s = new_table->CreateIndexReader(prefetch_buffer.get(), &index_reader,
|
|
meta_iter.get(), level);
|
|
if (s.ok()) {
|
|
rep->index_reader.reset(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_index_and_filter_in_cache || level == 0) {
|
|
rep->index_reader->CacheDependencies(pin_all);
|
|
}
|
|
|
|
// Set filter block
|
|
if (rep->filter_policy) {
|
|
const bool is_a_filter_partition = true;
|
|
auto filter = new_table->ReadFilter(
|
|
prefetch_buffer.get(), rep->filter_handle, !is_a_filter_partition,
|
|
rep->table_prefix_extractor.get());
|
|
rep->filter.reset(filter);
|
|
// Refer to the comment above about paritioned indexes always being
|
|
// cached
|
|
if (filter && (prefetch_index_and_filter_in_cache || level == 0)) {
|
|
filter->CacheDependencies(pin_all, rep->table_prefix_extractor.get());
|
|
}
|
|
}
|
|
} else {
|
|
delete index_reader;
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
assert(prefetch_buffer.get() != nullptr);
|
|
if (tail_prefetch_stats != nullptr) {
|
|
assert(prefetch_buffer->min_offset_read() < file_size);
|
|
tail_prefetch_stats->RecordEffectiveSize(
|
|
file_size - prefetch_buffer->min_offset_read());
|
|
}
|
|
*table_reader = std::move(new_table);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
void BlockBasedTable::SetupForCompaction() {
|
|
switch (rep_->ioptions.access_hint_on_compaction_start) {
|
|
case Options::NONE:
|
|
break;
|
|
case Options::NORMAL:
|
|
rep_->file->file()->Hint(RandomAccessFile::NORMAL);
|
|
break;
|
|
case Options::SEQUENTIAL:
|
|
rep_->file->file()->Hint(RandomAccessFile::SEQUENTIAL);
|
|
break;
|
|
case Options::WILLNEED:
|
|
rep_->file->file()->Hint(RandomAccessFile::WILLNEED);
|
|
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();
|
|
}
|
|
return usage;
|
|
}
|
|
|
|
// Load the meta-block from the file. On success, return the loaded meta block
|
|
// and its iterator.
|
|
Status BlockBasedTable::ReadMetaBlock(Rep* rep,
|
|
FilePrefetchBuffer* prefetch_buffer,
|
|
std::unique_ptr<Block>* meta_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> meta;
|
|
Status s = ReadBlockFromFile(
|
|
rep->file.get(), prefetch_buffer, rep->footer, ReadOptions(),
|
|
rep->footer.metaindex_handle(), &meta, rep->ioptions,
|
|
true /* decompress */, Slice() /*compression dict*/,
|
|
rep->persistent_cache_options, kDisableGlobalSequenceNumber,
|
|
0 /* read_amp_bytes_per_bit */);
|
|
|
|
if (!s.ok()) {
|
|
ROCKS_LOG_ERROR(rep->ioptions.info_log,
|
|
"Encountered error while reading data from properties"
|
|
" block %s",
|
|
s.ToString().c_str());
|
|
return s;
|
|
}
|
|
|
|
*meta_block = std::move(meta);
|
|
// meta block uses bytewise comparator.
|
|
iter->reset(meta_block->get()->NewIterator<DataBlockIter>(
|
|
BytewiseComparator(), BytewiseComparator()));
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::GetDataBlockFromCache(
|
|
const Slice& block_cache_key, const Slice& compressed_block_cache_key,
|
|
Cache* block_cache, Cache* block_cache_compressed,
|
|
const ImmutableCFOptions& ioptions, const ReadOptions& read_options,
|
|
BlockBasedTable::CachableEntry<Block>* block, uint32_t format_version,
|
|
const Slice& compression_dict, size_t read_amp_bytes_per_bit, bool is_index,
|
|
GetContext* get_context) {
|
|
Status s;
|
|
Block* compressed_block = nullptr;
|
|
Cache::Handle* block_cache_compressed_handle = nullptr;
|
|
Statistics* statistics = ioptions.statistics;
|
|
|
|
// Lookup uncompressed cache first
|
|
if (block_cache != nullptr) {
|
|
block->cache_handle = GetEntryFromCache(
|
|
block_cache, block_cache_key,
|
|
is_index ? BLOCK_CACHE_INDEX_MISS : BLOCK_CACHE_DATA_MISS,
|
|
is_index ? BLOCK_CACHE_INDEX_HIT : BLOCK_CACHE_DATA_HIT,
|
|
get_context
|
|
? (is_index ? &get_context->get_context_stats_.num_cache_index_miss
|
|
: &get_context->get_context_stats_.num_cache_data_miss)
|
|
: nullptr,
|
|
get_context
|
|
? (is_index ? &get_context->get_context_stats_.num_cache_index_hit
|
|
: &get_context->get_context_stats_.num_cache_data_hit)
|
|
: nullptr,
|
|
statistics, get_context);
|
|
if (block->cache_handle != nullptr) {
|
|
block->value =
|
|
reinterpret_cast<Block*>(block_cache->Value(block->cache_handle));
|
|
return s;
|
|
}
|
|
}
|
|
|
|
// If not found, search from the compressed block cache.
|
|
assert(block->cache_handle == nullptr && block->value == nullptr);
|
|
|
|
if (block_cache_compressed == nullptr) {
|
|
return s;
|
|
}
|
|
|
|
assert(!compressed_block_cache_key.empty());
|
|
block_cache_compressed_handle =
|
|
block_cache_compressed->Lookup(compressed_block_cache_key);
|
|
// 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<Block*>(
|
|
block_cache_compressed->Value(block_cache_compressed_handle));
|
|
assert(compressed_block->compression_type() != kNoCompression);
|
|
|
|
// Retrieve the uncompressed contents into a new buffer
|
|
BlockContents contents;
|
|
UncompressionContext uncompresssion_ctx(compressed_block->compression_type(),
|
|
compression_dict);
|
|
s = UncompressBlockContents(uncompresssion_ctx, compressed_block->data(),
|
|
compressed_block->size(), &contents,
|
|
format_version, ioptions);
|
|
|
|
// Insert uncompressed block into block cache
|
|
if (s.ok()) {
|
|
block->value =
|
|
new Block(std::move(contents), compressed_block->global_seqno(),
|
|
read_amp_bytes_per_bit,
|
|
statistics); // uncompressed block
|
|
assert(block->value->compression_type() == kNoCompression);
|
|
if (block_cache != nullptr && block->value->cachable() &&
|
|
read_options.fill_cache) {
|
|
size_t charge = block->value->ApproximateMemoryUsage();
|
|
s = block_cache->Insert(block_cache_key, block->value, charge,
|
|
&DeleteCachedEntry<Block>,
|
|
&(block->cache_handle));
|
|
block_cache->TEST_mark_as_data_block(block_cache_key, charge);
|
|
if (s.ok()) {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_add++;
|
|
get_context->get_context_stats_.num_cache_bytes_write += charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, charge);
|
|
}
|
|
if (is_index) {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_index_add++;
|
|
get_context->get_context_stats_.num_cache_index_bytes_insert +=
|
|
charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT, charge);
|
|
}
|
|
} else {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_data_add++;
|
|
get_context->get_context_stats_.num_cache_data_bytes_insert +=
|
|
charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_DATA_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_DATA_BYTES_INSERT, charge);
|
|
}
|
|
}
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
delete block->value;
|
|
block->value = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Release hold on compressed cache entry
|
|
block_cache_compressed->Release(block_cache_compressed_handle);
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::PutDataBlockToCache(
|
|
const Slice& block_cache_key, const Slice& compressed_block_cache_key,
|
|
Cache* block_cache, Cache* block_cache_compressed,
|
|
const ReadOptions& /*read_options*/, const ImmutableCFOptions& ioptions,
|
|
CachableEntry<Block>* block, Block* raw_block, uint32_t format_version,
|
|
const Slice& compression_dict, size_t read_amp_bytes_per_bit, bool is_index,
|
|
Cache::Priority priority, GetContext* get_context) {
|
|
assert(raw_block->compression_type() == kNoCompression ||
|
|
block_cache_compressed != nullptr);
|
|
|
|
Status s;
|
|
// Retrieve the uncompressed contents into a new buffer
|
|
BlockContents contents;
|
|
Statistics* statistics = ioptions.statistics;
|
|
if (raw_block->compression_type() != kNoCompression) {
|
|
UncompressionContext uncompression_ctx(raw_block->compression_type(),
|
|
compression_dict);
|
|
s = UncompressBlockContents(uncompression_ctx, raw_block->data(),
|
|
raw_block->size(), &contents, format_version,
|
|
ioptions);
|
|
}
|
|
if (!s.ok()) {
|
|
delete raw_block;
|
|
return s;
|
|
}
|
|
|
|
if (raw_block->compression_type() != kNoCompression) {
|
|
block->value = new Block(std::move(contents), raw_block->global_seqno(),
|
|
read_amp_bytes_per_bit,
|
|
statistics); // uncompressed block
|
|
} else {
|
|
block->value = raw_block;
|
|
raw_block = nullptr;
|
|
}
|
|
|
|
// Insert compressed block into compressed block cache.
|
|
// Release the hold on the compressed cache entry immediately.
|
|
if (block_cache_compressed != nullptr && raw_block != nullptr &&
|
|
raw_block->cachable()) {
|
|
s = block_cache_compressed->Insert(compressed_block_cache_key, raw_block,
|
|
raw_block->ApproximateMemoryUsage(),
|
|
&DeleteCachedEntry<Block>);
|
|
if (s.ok()) {
|
|
// Avoid the following code to delete this cached block.
|
|
raw_block = nullptr;
|
|
RecordTick(statistics, BLOCK_CACHE_COMPRESSED_ADD);
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_COMPRESSED_ADD_FAILURES);
|
|
}
|
|
}
|
|
delete raw_block;
|
|
|
|
// insert into uncompressed block cache
|
|
assert((block->value->compression_type() == kNoCompression));
|
|
if (block_cache != nullptr && block->value->cachable()) {
|
|
size_t charge = block->value->ApproximateMemoryUsage();
|
|
s = block_cache->Insert(block_cache_key, block->value, charge,
|
|
&DeleteCachedEntry<Block>, &(block->cache_handle),
|
|
priority);
|
|
block_cache->TEST_mark_as_data_block(block_cache_key, charge);
|
|
if (s.ok()) {
|
|
assert(block->cache_handle != nullptr);
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_add++;
|
|
get_context->get_context_stats_.num_cache_bytes_write += charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, charge);
|
|
}
|
|
if (is_index) {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_index_add++;
|
|
get_context->get_context_stats_.num_cache_index_bytes_insert +=
|
|
charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT, charge);
|
|
}
|
|
} else {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_data_add++;
|
|
get_context->get_context_stats_.num_cache_data_bytes_insert += charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_DATA_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_DATA_BYTES_INSERT, charge);
|
|
}
|
|
}
|
|
assert(reinterpret_cast<Block*>(
|
|
block_cache->Value(block->cache_handle)) == block->value);
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
delete block->value;
|
|
block->value = nullptr;
|
|
}
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
FilterBlockReader* BlockBasedTable::ReadFilter(
|
|
FilePrefetchBuffer* prefetch_buffer, const BlockHandle& filter_handle,
|
|
const bool is_a_filter_partition,
|
|
const SliceTransform* prefix_extractor) const {
|
|
auto& rep = rep_;
|
|
// TODO: We might want to unify with ReadBlockFromFile() if we start
|
|
// requiring checksum verification in Table::Open.
|
|
if (rep->filter_type == Rep::FilterType::kNoFilter) {
|
|
return nullptr;
|
|
}
|
|
BlockContents block;
|
|
|
|
Slice dummy_comp_dict;
|
|
|
|
BlockFetcher block_fetcher(rep->file.get(), prefetch_buffer, rep->footer,
|
|
ReadOptions(), filter_handle, &block,
|
|
rep->ioptions, false /* decompress */,
|
|
dummy_comp_dict, rep->persistent_cache_options);
|
|
Status s = block_fetcher.ReadBlockContents();
|
|
|
|
if (!s.ok()) {
|
|
// Error reading the block
|
|
return nullptr;
|
|
}
|
|
|
|
assert(rep->filter_policy);
|
|
|
|
auto filter_type = rep->filter_type;
|
|
if (rep->filter_type == Rep::FilterType::kPartitionedFilter &&
|
|
is_a_filter_partition) {
|
|
filter_type = Rep::FilterType::kFullFilter;
|
|
}
|
|
|
|
switch (filter_type) {
|
|
case Rep::FilterType::kPartitionedFilter: {
|
|
return new PartitionedFilterBlockReader(
|
|
rep->prefix_filtering ? prefix_extractor : nullptr,
|
|
rep->whole_key_filtering, std::move(block), nullptr,
|
|
rep->ioptions.statistics, rep->internal_comparator, this,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_key_is_user_key == 0,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_value_is_delta_encoded == 0);
|
|
}
|
|
|
|
case Rep::FilterType::kBlockFilter:
|
|
return new BlockBasedFilterBlockReader(
|
|
rep->prefix_filtering ? prefix_extractor : nullptr,
|
|
rep->table_options, rep->whole_key_filtering, std::move(block),
|
|
rep->ioptions.statistics);
|
|
|
|
case Rep::FilterType::kFullFilter: {
|
|
auto filter_bits_reader =
|
|
rep->filter_policy->GetFilterBitsReader(block.data);
|
|
assert(filter_bits_reader != nullptr);
|
|
return new FullFilterBlockReader(
|
|
rep->prefix_filtering ? prefix_extractor : nullptr,
|
|
rep->whole_key_filtering, std::move(block), filter_bits_reader,
|
|
rep->ioptions.statistics);
|
|
}
|
|
|
|
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 nullptr;
|
|
}
|
|
}
|
|
|
|
BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
|
|
const SliceTransform* prefix_extractor, FilePrefetchBuffer* prefetch_buffer,
|
|
bool no_io, GetContext* get_context) const {
|
|
const BlockHandle& filter_blk_handle = rep_->filter_handle;
|
|
const bool is_a_filter_partition = true;
|
|
return GetFilter(prefetch_buffer, filter_blk_handle, !is_a_filter_partition,
|
|
no_io, get_context, prefix_extractor);
|
|
}
|
|
|
|
BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
|
|
FilePrefetchBuffer* prefetch_buffer, const BlockHandle& filter_blk_handle,
|
|
const bool is_a_filter_partition, bool no_io, GetContext* get_context,
|
|
const SliceTransform* prefix_extractor) const {
|
|
// If cache_index_and_filter_blocks is false, filter should be pre-populated.
|
|
// We will return rep_->filter anyway. rep_->filter can be nullptr if filter
|
|
// read fails at Open() time. We don't want to reload again since it will
|
|
// most probably fail again.
|
|
if (!is_a_filter_partition &&
|
|
!rep_->table_options.cache_index_and_filter_blocks) {
|
|
return {rep_->filter.get(), nullptr /* cache handle */};
|
|
}
|
|
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
if (rep_->filter_policy == nullptr /* do not use filter */ ||
|
|
block_cache == nullptr /* no block cache at all */) {
|
|
return {nullptr /* filter */, nullptr /* cache handle */};
|
|
}
|
|
|
|
if (!is_a_filter_partition && rep_->filter_entry.IsSet()) {
|
|
return rep_->filter_entry;
|
|
}
|
|
|
|
PERF_TIMER_GUARD(read_filter_block_nanos);
|
|
|
|
// Fetching from the cache
|
|
char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
auto key = GetCacheKey(rep_->cache_key_prefix, rep_->cache_key_prefix_size,
|
|
filter_blk_handle, cache_key);
|
|
|
|
Statistics* statistics = rep_->ioptions.statistics;
|
|
auto cache_handle = GetEntryFromCache(
|
|
block_cache, key, BLOCK_CACHE_FILTER_MISS, BLOCK_CACHE_FILTER_HIT,
|
|
get_context ? &get_context->get_context_stats_.num_cache_filter_miss
|
|
: nullptr,
|
|
get_context ? &get_context->get_context_stats_.num_cache_filter_hit
|
|
: nullptr,
|
|
statistics, get_context);
|
|
|
|
FilterBlockReader* filter = nullptr;
|
|
if (cache_handle != nullptr) {
|
|
filter = reinterpret_cast<FilterBlockReader*>(
|
|
block_cache->Value(cache_handle));
|
|
} else if (no_io) {
|
|
// Do not invoke any io.
|
|
return CachableEntry<FilterBlockReader>();
|
|
} else {
|
|
filter = ReadFilter(prefetch_buffer, filter_blk_handle,
|
|
is_a_filter_partition, prefix_extractor);
|
|
if (filter != nullptr) {
|
|
size_t usage = filter->ApproximateMemoryUsage();
|
|
Status s = block_cache->Insert(
|
|
key, filter, usage, &DeleteCachedFilterEntry, &cache_handle,
|
|
rep_->table_options.cache_index_and_filter_blocks_with_high_priority
|
|
? Cache::Priority::HIGH
|
|
: Cache::Priority::LOW);
|
|
if (s.ok()) {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_add++;
|
|
get_context->get_context_stats_.num_cache_bytes_write += usage;
|
|
get_context->get_context_stats_.num_cache_filter_add++;
|
|
get_context->get_context_stats_.num_cache_filter_bytes_insert +=
|
|
usage;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, usage);
|
|
RecordTick(statistics, BLOCK_CACHE_FILTER_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_FILTER_BYTES_INSERT, usage);
|
|
}
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
delete filter;
|
|
return CachableEntry<FilterBlockReader>();
|
|
}
|
|
}
|
|
}
|
|
|
|
return { filter, cache_handle };
|
|
}
|
|
|
|
// 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<BlockHandle>* BlockBasedTable::NewIndexIterator(
|
|
const ReadOptions& read_options, bool disable_prefix_seek,
|
|
IndexBlockIter* input_iter, CachableEntry<IndexReader>* index_entry,
|
|
GetContext* get_context) {
|
|
// index reader has already been pre-populated.
|
|
if (rep_->index_reader) {
|
|
return rep_->index_reader->NewIterator(
|
|
input_iter, read_options.total_order_seek || disable_prefix_seek,
|
|
read_options.fill_cache);
|
|
}
|
|
// we have a pinned index block
|
|
if (rep_->index_entry.IsSet()) {
|
|
return rep_->index_entry.value->NewIterator(
|
|
input_iter, read_options.total_order_seek || disable_prefix_seek,
|
|
read_options.fill_cache);
|
|
}
|
|
|
|
PERF_TIMER_GUARD(read_index_block_nanos);
|
|
|
|
const bool no_io = read_options.read_tier == kBlockCacheTier;
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
auto key =
|
|
GetCacheKeyFromOffset(rep_->cache_key_prefix, rep_->cache_key_prefix_size,
|
|
rep_->dummy_index_reader_offset, cache_key);
|
|
Statistics* statistics = rep_->ioptions.statistics;
|
|
auto cache_handle = GetEntryFromCache(
|
|
block_cache, key, BLOCK_CACHE_INDEX_MISS, BLOCK_CACHE_INDEX_HIT,
|
|
get_context ? &get_context->get_context_stats_.num_cache_index_miss
|
|
: nullptr,
|
|
get_context ? &get_context->get_context_stats_.num_cache_index_hit
|
|
: nullptr,
|
|
statistics, get_context);
|
|
|
|
if (cache_handle == nullptr && no_io) {
|
|
if (input_iter != nullptr) {
|
|
input_iter->Invalidate(Status::Incomplete("no blocking io"));
|
|
return input_iter;
|
|
} else {
|
|
return NewErrorInternalIterator<BlockHandle>(
|
|
Status::Incomplete("no blocking io"));
|
|
}
|
|
}
|
|
|
|
IndexReader* index_reader = nullptr;
|
|
if (cache_handle != nullptr) {
|
|
index_reader =
|
|
reinterpret_cast<IndexReader*>(block_cache->Value(cache_handle));
|
|
} else {
|
|
// Create index reader and put it in the cache.
|
|
Status s;
|
|
TEST_SYNC_POINT("BlockBasedTable::NewIndexIterator::thread2:2");
|
|
s = CreateIndexReader(nullptr /* prefetch_buffer */, &index_reader);
|
|
TEST_SYNC_POINT("BlockBasedTable::NewIndexIterator::thread1:1");
|
|
TEST_SYNC_POINT("BlockBasedTable::NewIndexIterator::thread2:3");
|
|
TEST_SYNC_POINT("BlockBasedTable::NewIndexIterator::thread1:4");
|
|
size_t charge = 0;
|
|
if (s.ok()) {
|
|
assert(index_reader != nullptr);
|
|
charge = index_reader->ApproximateMemoryUsage();
|
|
s = block_cache->Insert(
|
|
key, index_reader, charge, &DeleteCachedIndexEntry, &cache_handle,
|
|
rep_->table_options.cache_index_and_filter_blocks_with_high_priority
|
|
? Cache::Priority::HIGH
|
|
: Cache::Priority::LOW);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
if (get_context != nullptr) {
|
|
get_context->get_context_stats_.num_cache_add++;
|
|
get_context->get_context_stats_.num_cache_bytes_write += charge;
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, charge);
|
|
}
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT, charge);
|
|
} else {
|
|
if (index_reader != nullptr) {
|
|
delete index_reader;
|
|
}
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
// make sure if something goes wrong, index_reader shall remain intact.
|
|
if (input_iter != nullptr) {
|
|
input_iter->Invalidate(s);
|
|
return input_iter;
|
|
} else {
|
|
return NewErrorInternalIterator<BlockHandle>(s);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
assert(cache_handle);
|
|
auto* iter = index_reader->NewIterator(
|
|
input_iter, read_options.total_order_seek || disable_prefix_seek);
|
|
|
|
// the caller would like to take ownership of the index block
|
|
// don't call RegisterCleanup() in this case, the caller will take care of it
|
|
if (index_entry != nullptr) {
|
|
*index_entry = {index_reader, cache_handle};
|
|
} else {
|
|
iter->RegisterCleanup(&ReleaseCachedEntry, block_cache, cache_handle);
|
|
}
|
|
|
|
return iter;
|
|
}
|
|
|
|
// Convert an index iterator value (i.e., an encoded BlockHandle)
|
|
// into an iterator over the contents of the corresponding block.
|
|
// If input_iter is null, new a iterator
|
|
// If input_iter is not null, update this iter and return it
|
|
template <typename TBlockIter>
|
|
TBlockIter* BlockBasedTable::NewDataBlockIterator(
|
|
Rep* rep, const ReadOptions& ro, const BlockHandle& handle,
|
|
TBlockIter* input_iter, bool is_index, bool key_includes_seq,
|
|
bool index_key_is_full, GetContext* get_context, Status s,
|
|
FilePrefetchBuffer* prefetch_buffer) {
|
|
PERF_TIMER_GUARD(new_table_block_iter_nanos);
|
|
|
|
const bool no_io = (ro.read_tier == kBlockCacheTier);
|
|
Cache* block_cache = rep->table_options.block_cache.get();
|
|
CachableEntry<Block> block;
|
|
Slice compression_dict;
|
|
if (s.ok()) {
|
|
if (rep->compression_dict_block) {
|
|
compression_dict = rep->compression_dict_block->data;
|
|
}
|
|
s = MaybeLoadDataBlockToCache(prefetch_buffer, rep, ro, handle,
|
|
compression_dict, &block, is_index,
|
|
get_context);
|
|
}
|
|
|
|
TBlockIter* iter;
|
|
if (input_iter != nullptr) {
|
|
iter = input_iter;
|
|
} else {
|
|
iter = new TBlockIter;
|
|
}
|
|
// Didn't get any data from block caches.
|
|
if (s.ok() && block.value == nullptr) {
|
|
if (no_io) {
|
|
// Could not read from block_cache and can't do IO
|
|
iter->Invalidate(Status::Incomplete("no blocking io"));
|
|
return iter;
|
|
}
|
|
std::unique_ptr<Block> block_value;
|
|
{
|
|
StopWatch sw(rep->ioptions.env, rep->ioptions.statistics,
|
|
READ_BLOCK_GET_MICROS);
|
|
s = ReadBlockFromFile(
|
|
rep->file.get(), prefetch_buffer, rep->footer, ro, handle,
|
|
&block_value, rep->ioptions, rep->blocks_maybe_compressed,
|
|
compression_dict, rep->persistent_cache_options,
|
|
is_index ? kDisableGlobalSequenceNumber : rep->global_seqno,
|
|
rep->table_options.read_amp_bytes_per_bit, rep->immortal_table);
|
|
}
|
|
if (s.ok()) {
|
|
block.value = block_value.release();
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
assert(block.value != nullptr);
|
|
const bool kTotalOrderSeek = true;
|
|
iter = block.value->NewIterator<TBlockIter>(
|
|
&rep->internal_comparator, rep->internal_comparator.user_comparator(),
|
|
iter, rep->ioptions.statistics, kTotalOrderSeek, key_includes_seq,
|
|
index_key_is_full);
|
|
if (block.cache_handle != nullptr) {
|
|
iter->RegisterCleanup(&ReleaseCachedEntry, block_cache,
|
|
block.cache_handle);
|
|
} else {
|
|
if (!ro.fill_cache && rep->cache_key_prefix_size != 0) {
|
|
// insert a dummy record to block cache to track the memory usage
|
|
Cache::Handle* cache_handle;
|
|
// There are two other types of cache keys: 1) SST cache key added in
|
|
// `MaybeLoadDataBlockToCache` 2) dummy cache key added in
|
|
// `write_buffer_manager`. Use longer prefix (41 bytes) to differentiate
|
|
// from SST cache key(31 bytes), and use non-zero prefix to
|
|
// differentiate from `write_buffer_manager`
|
|
const size_t kExtraCacheKeyPrefix = kMaxVarint64Length * 4 + 1;
|
|
char cache_key[kExtraCacheKeyPrefix + kMaxVarint64Length];
|
|
// Prefix: use rep->cache_key_prefix padded by 0s
|
|
memset(cache_key, 0, kExtraCacheKeyPrefix + kMaxVarint64Length);
|
|
assert(rep->cache_key_prefix_size != 0);
|
|
assert(rep->cache_key_prefix_size <= kExtraCacheKeyPrefix);
|
|
memcpy(cache_key, rep->cache_key_prefix, rep->cache_key_prefix_size);
|
|
char* end = EncodeVarint64(cache_key + kExtraCacheKeyPrefix,
|
|
next_cache_key_id_++);
|
|
assert(end - cache_key <=
|
|
static_cast<int>(kExtraCacheKeyPrefix + kMaxVarint64Length));
|
|
Slice unique_key =
|
|
Slice(cache_key, static_cast<size_t>(end - cache_key));
|
|
s = block_cache->Insert(unique_key, nullptr,
|
|
block.value->ApproximateMemoryUsage(), nullptr,
|
|
&cache_handle);
|
|
if (s.ok()) {
|
|
if (cache_handle != nullptr) {
|
|
iter->RegisterCleanup(&ForceReleaseCachedEntry, block_cache,
|
|
cache_handle);
|
|
}
|
|
}
|
|
}
|
|
iter->RegisterCleanup(&DeleteHeldResource<Block>, block.value, nullptr);
|
|
}
|
|
} else {
|
|
assert(block.value == nullptr);
|
|
iter->Invalidate(s);
|
|
}
|
|
return iter;
|
|
}
|
|
|
|
Status BlockBasedTable::MaybeLoadDataBlockToCache(
|
|
FilePrefetchBuffer* prefetch_buffer, Rep* rep, const ReadOptions& ro,
|
|
const BlockHandle& handle, Slice compression_dict,
|
|
CachableEntry<Block>* block_entry, bool is_index, GetContext* get_context) {
|
|
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();
|
|
|
|
// If either block cache is enabled, we'll try to read from it.
|
|
Status s;
|
|
if (block_cache != nullptr || block_cache_compressed != nullptr) {
|
|
Statistics* statistics = rep->ioptions.statistics;
|
|
char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
char compressed_cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
Slice key, /* key to the block cache */
|
|
ckey /* key to the compressed block cache */;
|
|
|
|
// 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);
|
|
}
|
|
|
|
s = GetDataBlockFromCache(
|
|
key, ckey, block_cache, block_cache_compressed, rep->ioptions, ro,
|
|
block_entry, rep->table_options.format_version, compression_dict,
|
|
rep->table_options.read_amp_bytes_per_bit, is_index, get_context);
|
|
|
|
if (block_entry->value == nullptr && !no_io && ro.fill_cache) {
|
|
std::unique_ptr<Block> raw_block;
|
|
{
|
|
StopWatch sw(rep->ioptions.env, statistics, READ_BLOCK_GET_MICROS);
|
|
s = ReadBlockFromFile(
|
|
rep->file.get(), prefetch_buffer, rep->footer, ro, handle,
|
|
&raw_block, rep->ioptions,
|
|
block_cache_compressed == nullptr && rep->blocks_maybe_compressed,
|
|
compression_dict, rep->persistent_cache_options,
|
|
is_index ? kDisableGlobalSequenceNumber : rep->global_seqno,
|
|
rep->table_options.read_amp_bytes_per_bit, rep->immortal_table);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
s = PutDataBlockToCache(
|
|
key, ckey, block_cache, block_cache_compressed, ro, rep->ioptions,
|
|
block_entry, raw_block.release(), rep->table_options.format_version,
|
|
compression_dict, rep->table_options.read_amp_bytes_per_bit,
|
|
is_index,
|
|
is_index && rep->table_options
|
|
.cache_index_and_filter_blocks_with_high_priority
|
|
? Cache::Priority::HIGH
|
|
: Cache::Priority::LOW,
|
|
get_context);
|
|
}
|
|
}
|
|
}
|
|
assert(s.ok() || block_entry->value == nullptr);
|
|
return s;
|
|
}
|
|
|
|
BlockBasedTable::PartitionedIndexIteratorState::PartitionedIndexIteratorState(
|
|
BlockBasedTable* table,
|
|
std::unordered_map<uint64_t, CachableEntry<Block>>* block_map,
|
|
bool index_key_includes_seq, bool index_key_is_full)
|
|
: table_(table),
|
|
block_map_(block_map),
|
|
index_key_includes_seq_(index_key_includes_seq),
|
|
index_key_is_full_(index_key_is_full) {}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
const size_t BlockBasedTableIterator<TBlockIter, TValue>::kMaxReadaheadSize =
|
|
256 * 1024;
|
|
|
|
InternalIteratorBase<BlockHandle>*
|
|
BlockBasedTable::PartitionedIndexIteratorState::NewSecondaryIterator(
|
|
const BlockHandle& handle) {
|
|
// Return a block iterator on the index partition
|
|
auto rep = table_->get_rep();
|
|
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()) {
|
|
PERF_COUNTER_ADD(block_cache_hit_count, 1);
|
|
RecordTick(rep->ioptions.statistics, BLOCK_CACHE_INDEX_HIT);
|
|
RecordTick(rep->ioptions.statistics, BLOCK_CACHE_HIT);
|
|
Cache* block_cache = rep->table_options.block_cache.get();
|
|
assert(block_cache);
|
|
RecordTick(rep->ioptions.statistics, BLOCK_CACHE_BYTES_READ,
|
|
block_cache->GetUsage(block->second.cache_handle));
|
|
Statistics* kNullStats = nullptr;
|
|
return block->second.value->NewIterator<IndexBlockIter>(
|
|
&rep->internal_comparator, rep->internal_comparator.user_comparator(),
|
|
nullptr, kNullStats, true, index_key_includes_seq_, index_key_is_full_);
|
|
}
|
|
// Create an empty iterator
|
|
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
|
|
//
|
|
// Otherwise, this method guarantees no I/O will be incurred.
|
|
//
|
|
// 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) {
|
|
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 user_key = ExtractUserKey(internal_key);
|
|
if (!prefix_extractor->InDomain(user_key)) {
|
|
return true;
|
|
}
|
|
|
|
bool may_match = true;
|
|
Status s;
|
|
|
|
// First, try check with full filter
|
|
auto filter_entry = GetFilter(prefix_extractor);
|
|
FilterBlockReader* filter = filter_entry.value;
|
|
bool filter_checked = true;
|
|
if (filter != nullptr) {
|
|
if (!filter->IsBlockBased()) {
|
|
const Slice* const const_ikey_ptr = &internal_key;
|
|
may_match = filter->RangeMayExist(
|
|
read_options.iterate_upper_bound, user_key, prefix_extractor,
|
|
rep_->internal_comparator.user_comparator(), const_ikey_ptr,
|
|
&filter_checked, need_upper_bound_check);
|
|
} else {
|
|
// if prefix_extractor changed for block based filter, skip filter
|
|
if (need_upper_bound_check) {
|
|
if (!rep_->filter_entry.IsSet()) {
|
|
filter_entry.Release(rep_->table_options.block_cache.get());
|
|
}
|
|
return true;
|
|
}
|
|
auto prefix = prefix_extractor->Transform(user_key);
|
|
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`
|
|
unique_ptr<InternalIteratorBase<BlockHandle>> iiter(
|
|
NewIndexIterator(no_io_read_options,
|
|
/* need_upper_bound_check */ false));
|
|
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_->table_properties &&
|
|
rep_->table_properties->index_key_is_user_key
|
|
? iiter->key()
|
|
: ExtractUserKey(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();
|
|
may_match =
|
|
filter->PrefixMayMatch(prefix, prefix_extractor, handle.offset());
|
|
}
|
|
}
|
|
}
|
|
|
|
if (filter_checked) {
|
|
Statistics* statistics = rep_->ioptions.statistics;
|
|
RecordTick(statistics, BLOOM_FILTER_PREFIX_CHECKED);
|
|
if (!may_match) {
|
|
RecordTick(statistics, BLOOM_FILTER_PREFIX_USEFUL);
|
|
}
|
|
}
|
|
|
|
// if rep_->filter_entry is not set, we should call Release(); otherwise
|
|
// don't call, in this case we have a local copy in rep_->filter_entry,
|
|
// it's pinned to the cache and will be released in the destructor
|
|
if (!rep_->filter_entry.IsSet()) {
|
|
filter_entry.Release(rep_->table_options.block_cache.get());
|
|
}
|
|
return may_match;
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::Seek(const Slice& target) {
|
|
is_out_of_bound_ = false;
|
|
if (!CheckPrefixMayMatch(target)) {
|
|
ResetDataIter();
|
|
return;
|
|
}
|
|
|
|
SavePrevIndexValue();
|
|
|
|
index_iter_->Seek(target);
|
|
|
|
if (!index_iter_->Valid()) {
|
|
ResetDataIter();
|
|
return;
|
|
}
|
|
|
|
InitDataBlock();
|
|
|
|
block_iter_.Seek(target);
|
|
|
|
FindKeyForward();
|
|
assert(
|
|
!block_iter_.Valid() ||
|
|
(key_includes_seq_ && icomp_.Compare(target, block_iter_.key()) <= 0) ||
|
|
(!key_includes_seq_ &&
|
|
icomp_.user_comparator()->Compare(ExtractUserKey(target),
|
|
block_iter_.key()) <= 0));
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::SeekForPrev(
|
|
const Slice& target) {
|
|
is_out_of_bound_ = false;
|
|
if (!CheckPrefixMayMatch(target)) {
|
|
ResetDataIter();
|
|
return;
|
|
}
|
|
|
|
SavePrevIndexValue();
|
|
|
|
// Call Seek() rather than SeekForPrev() in the index block, because the
|
|
// target data block will likely to contain the position for `target`, the
|
|
// same as Seek(), rather than than before.
|
|
// For example, if we have three data blocks, each containing two keys:
|
|
// [2, 4] [6, 8] [10, 12]
|
|
// (the keys in the index block would be [4, 8, 12])
|
|
// and the user calls SeekForPrev(7), we need to go to the second block,
|
|
// just like if they call Seek(7).
|
|
// The only case where the block is difference is when they seek to a position
|
|
// in the boundary. For example, if they SeekForPrev(5), we should go to the
|
|
// first block, rather than the second. However, we don't have the information
|
|
// to distinguish the two unless we read the second block. In this case, we'll
|
|
// end up with reading two blocks.
|
|
index_iter_->Seek(target);
|
|
|
|
if (!index_iter_->Valid()) {
|
|
index_iter_->SeekToLast();
|
|
if (!index_iter_->Valid()) {
|
|
ResetDataIter();
|
|
block_iter_points_to_real_block_ = false;
|
|
return;
|
|
}
|
|
}
|
|
|
|
InitDataBlock();
|
|
|
|
block_iter_.SeekForPrev(target);
|
|
|
|
FindKeyBackward();
|
|
assert(!block_iter_.Valid() ||
|
|
icomp_.Compare(target, block_iter_.key()) >= 0);
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::SeekToFirst() {
|
|
is_out_of_bound_ = false;
|
|
SavePrevIndexValue();
|
|
index_iter_->SeekToFirst();
|
|
if (!index_iter_->Valid()) {
|
|
ResetDataIter();
|
|
return;
|
|
}
|
|
InitDataBlock();
|
|
block_iter_.SeekToFirst();
|
|
FindKeyForward();
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::SeekToLast() {
|
|
is_out_of_bound_ = false;
|
|
SavePrevIndexValue();
|
|
index_iter_->SeekToLast();
|
|
if (!index_iter_->Valid()) {
|
|
ResetDataIter();
|
|
return;
|
|
}
|
|
InitDataBlock();
|
|
block_iter_.SeekToLast();
|
|
FindKeyBackward();
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::Next() {
|
|
assert(block_iter_points_to_real_block_);
|
|
block_iter_.Next();
|
|
FindKeyForward();
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::Prev() {
|
|
assert(block_iter_points_to_real_block_);
|
|
block_iter_.Prev();
|
|
FindKeyBackward();
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::InitDataBlock() {
|
|
BlockHandle data_block_handle = index_iter_->value();
|
|
if (!block_iter_points_to_real_block_ ||
|
|
data_block_handle.offset() != prev_index_value_.offset() ||
|
|
// if previous attempt of reading the block missed cache, try again
|
|
block_iter_.status().IsIncomplete()) {
|
|
if (block_iter_points_to_real_block_) {
|
|
ResetDataIter();
|
|
}
|
|
auto* rep = table_->get_rep();
|
|
|
|
// Automatically prefetch additional data when a range scan (iterator) does
|
|
// more than 2 sequential IOs. This is enabled only for user reads and when
|
|
// ReadOptions.readahead_size is 0.
|
|
if (!for_compaction_ && read_options_.readahead_size == 0) {
|
|
num_file_reads_++;
|
|
if (num_file_reads_ > 2) {
|
|
if (!rep->file->use_direct_io() &&
|
|
(data_block_handle.offset() +
|
|
static_cast<size_t>(data_block_handle.size()) +
|
|
kBlockTrailerSize >
|
|
readahead_limit_)) {
|
|
// Buffered I/O
|
|
// Discarding the return status of Prefetch calls intentionally, as we
|
|
// can fallback to reading from disk if Prefetch fails.
|
|
rep->file->Prefetch(data_block_handle.offset(), readahead_size_);
|
|
readahead_limit_ =
|
|
static_cast<size_t>(data_block_handle.offset() + readahead_size_);
|
|
// Keep exponentially increasing readahead size until
|
|
// kMaxReadaheadSize.
|
|
readahead_size_ = std::min(kMaxReadaheadSize, readahead_size_ * 2);
|
|
} else if (rep->file->use_direct_io() && !prefetch_buffer_) {
|
|
// Direct I/O
|
|
// Let FilePrefetchBuffer take care of the readahead.
|
|
prefetch_buffer_.reset(new FilePrefetchBuffer(
|
|
rep->file.get(), kInitReadaheadSize, kMaxReadaheadSize));
|
|
}
|
|
}
|
|
}
|
|
|
|
Status s;
|
|
BlockBasedTable::NewDataBlockIterator<TBlockIter>(
|
|
rep, read_options_, data_block_handle, &block_iter_, is_index_,
|
|
key_includes_seq_, index_key_is_full_,
|
|
/* get_context */ nullptr, s, prefetch_buffer_.get());
|
|
block_iter_points_to_real_block_ = true;
|
|
}
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::FindKeyForward() {
|
|
assert(!is_out_of_bound_);
|
|
// TODO the while loop inherits from two-level-iterator. We don't know
|
|
// whether a block can be empty so it can be replaced by an "if".
|
|
while (!block_iter_.Valid()) {
|
|
if (!block_iter_.status().ok()) {
|
|
return;
|
|
}
|
|
ResetDataIter();
|
|
// We used to check the current index key for upperbound.
|
|
// It will only save a data reading for a small percentage of use cases,
|
|
// so for code simplicity, we removed it. We can add it back if there is a
|
|
// significnat performance regression.
|
|
index_iter_->Next();
|
|
|
|
if (index_iter_->Valid()) {
|
|
InitDataBlock();
|
|
block_iter_.SeekToFirst();
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Check upper bound on the current key
|
|
bool reached_upper_bound =
|
|
(read_options_.iterate_upper_bound != nullptr &&
|
|
block_iter_points_to_real_block_ && block_iter_.Valid() &&
|
|
icomp_.user_comparator()->Compare(ExtractUserKey(block_iter_.key()),
|
|
*read_options_.iterate_upper_bound) >=
|
|
0);
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"BlockBasedTable::BlockEntryIteratorState::KeyReachedUpperBound",
|
|
&reached_upper_bound);
|
|
if (reached_upper_bound) {
|
|
is_out_of_bound_ = true;
|
|
return;
|
|
}
|
|
}
|
|
|
|
template <class TBlockIter, typename TValue>
|
|
void BlockBasedTableIterator<TBlockIter, TValue>::FindKeyBackward() {
|
|
assert(!is_out_of_bound_);
|
|
while (!block_iter_.Valid()) {
|
|
if (!block_iter_.status().ok()) {
|
|
return;
|
|
}
|
|
|
|
ResetDataIter();
|
|
index_iter_->Prev();
|
|
|
|
if (index_iter_->Valid()) {
|
|
InitDataBlock();
|
|
block_iter_.SeekToLast();
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// We could have check lower bound here too, but we opt not to do it for
|
|
// code simplicity.
|
|
}
|
|
|
|
InternalIterator* BlockBasedTable::NewIterator(
|
|
const ReadOptions& read_options, const SliceTransform* prefix_extractor,
|
|
Arena* arena, bool skip_filters, bool for_compaction) {
|
|
bool need_upper_bound_check =
|
|
PrefixExtractorChanged(rep_->table_properties.get(), prefix_extractor);
|
|
const bool kIsNotIndex = false;
|
|
if (arena == nullptr) {
|
|
return new BlockBasedTableIterator<DataBlockIter>(
|
|
this, read_options, rep_->internal_comparator,
|
|
NewIndexIterator(
|
|
read_options,
|
|
need_upper_bound_check &&
|
|
rep_->index_type == BlockBasedTableOptions::kHashSearch),
|
|
!skip_filters && !read_options.total_order_seek &&
|
|
prefix_extractor != nullptr,
|
|
need_upper_bound_check, prefix_extractor, kIsNotIndex,
|
|
true /*key_includes_seq*/, for_compaction);
|
|
} else {
|
|
auto* mem =
|
|
arena->AllocateAligned(sizeof(BlockBasedTableIterator<DataBlockIter>));
|
|
return new (mem) BlockBasedTableIterator<DataBlockIter>(
|
|
this, read_options, rep_->internal_comparator,
|
|
NewIndexIterator(read_options, need_upper_bound_check),
|
|
!skip_filters && !read_options.total_order_seek &&
|
|
prefix_extractor != nullptr,
|
|
need_upper_bound_check, prefix_extractor, kIsNotIndex,
|
|
true /*key_includes_seq*/, for_compaction);
|
|
}
|
|
}
|
|
|
|
InternalIterator* BlockBasedTable::NewRangeTombstoneIterator(
|
|
const ReadOptions& read_options) {
|
|
if (rep_->range_del_handle.IsNull()) {
|
|
// The block didn't exist, nullptr indicates no range tombstones.
|
|
return nullptr;
|
|
}
|
|
if (rep_->range_del_entry.cache_handle != nullptr) {
|
|
// We have a handle to an uncompressed block cache entry that's held for
|
|
// this table's lifetime. Increment its refcount before returning an
|
|
// iterator based on it since the returned iterator may outlive this table
|
|
// reader.
|
|
assert(rep_->range_del_entry.value != nullptr);
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
assert(block_cache != nullptr);
|
|
if (block_cache->Ref(rep_->range_del_entry.cache_handle)) {
|
|
auto iter = rep_->range_del_entry.value->NewIterator<DataBlockIter>(
|
|
&rep_->internal_comparator,
|
|
rep_->internal_comparator.user_comparator());
|
|
iter->RegisterCleanup(&ReleaseCachedEntry, block_cache,
|
|
rep_->range_del_entry.cache_handle);
|
|
return iter;
|
|
}
|
|
}
|
|
// The meta-block exists but isn't in uncompressed block cache (maybe
|
|
// because it is disabled), so go through the full lookup process.
|
|
return NewDataBlockIterator<DataBlockIter>(rep_, read_options,
|
|
rep_->range_del_handle);
|
|
}
|
|
|
|
bool BlockBasedTable::FullFilterKeyMayMatch(
|
|
const ReadOptions& read_options, FilterBlockReader* filter,
|
|
const Slice& internal_key, const bool no_io,
|
|
const SliceTransform* prefix_extractor) 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;
|
|
if (filter->whole_key_filtering()) {
|
|
may_match = filter->KeyMayMatch(user_key, prefix_extractor, kNotValid,
|
|
no_io, const_ikey_ptr);
|
|
} 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) &&
|
|
!filter->PrefixMayMatch(prefix_extractor->Transform(user_key),
|
|
prefix_extractor, kNotValid, false,
|
|
const_ikey_ptr)) {
|
|
may_match = false;
|
|
}
|
|
if (may_match) {
|
|
RecordTick(rep_->ioptions.statistics, BLOOM_FILTER_FULL_POSITIVE);
|
|
}
|
|
return may_match;
|
|
}
|
|
|
|
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
|
|
Status s;
|
|
const bool no_io = read_options.read_tier == kBlockCacheTier;
|
|
CachableEntry<FilterBlockReader> filter_entry;
|
|
if (!skip_filters) {
|
|
filter_entry =
|
|
GetFilter(prefix_extractor, /*prefetch_buffer*/ nullptr,
|
|
read_options.read_tier == kBlockCacheTier, get_context);
|
|
}
|
|
FilterBlockReader* filter = filter_entry.value;
|
|
|
|
// First check the full filter
|
|
// If full filter not useful, Then go into each block
|
|
if (!FullFilterKeyMayMatch(read_options, filter, key, no_io,
|
|
prefix_extractor)) {
|
|
RecordTick(rep_->ioptions.statistics, BLOOM_FILTER_USEFUL);
|
|
} 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,
|
|
/* index_entry */ nullptr, get_context);
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr.reset(iiter);
|
|
}
|
|
|
|
bool matched = false; // if such user key mathced a key in SST
|
|
bool done = false;
|
|
for (iiter->Seek(key); iiter->Valid() && !done; iiter->Next()) {
|
|
BlockHandle handle = iiter->value();
|
|
|
|
bool not_exist_in_filter =
|
|
filter != nullptr && filter->IsBlockBased() == true &&
|
|
!filter->KeyMayMatch(ExtractUserKey(key), prefix_extractor,
|
|
handle.offset(), no_io);
|
|
|
|
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.statistics, BLOOM_FILTER_USEFUL);
|
|
break;
|
|
} else {
|
|
DataBlockIter biter;
|
|
NewDataBlockIterator<DataBlockIter>(
|
|
rep_, read_options, iiter->value(), &biter, false,
|
|
true /* key_includes_seq */, get_context);
|
|
|
|
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;
|
|
if (!ParseInternalKey(biter.key(), &parsed_key)) {
|
|
s = Status::Corruption(Slice());
|
|
}
|
|
|
|
if (!get_context->SaveValue(
|
|
parsed_key, biter.value(), &matched,
|
|
biter.IsValuePinned() ? &biter : nullptr)) {
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
s = biter.status();
|
|
}
|
|
if (done) {
|
|
// Avoid the extra Next which is expensive in two-level indexes
|
|
break;
|
|
}
|
|
}
|
|
if (matched && filter != nullptr && !filter->IsBlockBased()) {
|
|
RecordTick(rep_->ioptions.statistics, BLOOM_FILTER_FULL_TRUE_POSITIVE);
|
|
}
|
|
if (s.ok()) {
|
|
s = iiter->status();
|
|
}
|
|
}
|
|
|
|
// if rep_->filter_entry is not set, we should call Release(); otherwise
|
|
// don't call, in this case we have a local copy in rep_->filter_entry,
|
|
// it's pinned to the cache and will be released in the destructor
|
|
if (!rep_->filter_entry.IsSet()) {
|
|
filter_entry.Release(rep_->table_options.block_cache.get());
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::Prefetch(const Slice* const begin,
|
|
const Slice* const end) {
|
|
auto& comparator = rep_->internal_comparator;
|
|
auto user_comparator = comparator.user_comparator();
|
|
// pre-condition
|
|
if (begin && end && comparator.Compare(*begin, *end) > 0) {
|
|
return Status::InvalidArgument(*begin, *end);
|
|
}
|
|
|
|
IndexBlockIter iiter_on_stack;
|
|
auto iiter = NewIndexIterator(ReadOptions(), false, &iiter_on_stack);
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr =
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>>(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();
|
|
const bool is_user_key = rep_->table_properties &&
|
|
rep_->table_properties->index_key_is_user_key > 0;
|
|
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>(rep_, ReadOptions(), block_handle,
|
|
&biter);
|
|
|
|
if (!biter.status().ok()) {
|
|
// there was an unexpected error while pre-fetching
|
|
return biter.status();
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::VerifyChecksum() {
|
|
Status s;
|
|
// Check Meta blocks
|
|
std::unique_ptr<Block> meta;
|
|
std::unique_ptr<InternalIterator> meta_iter;
|
|
s = ReadMetaBlock(rep_, nullptr /* prefetch buffer */, &meta, &meta_iter);
|
|
if (s.ok()) {
|
|
s = VerifyChecksumInBlocks(meta_iter.get());
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
} else {
|
|
return s;
|
|
}
|
|
// Check Data blocks
|
|
IndexBlockIter iiter_on_stack;
|
|
InternalIteratorBase<BlockHandle>* iiter =
|
|
NewIndexIterator(ReadOptions(), false, &iiter_on_stack);
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> iiter_unique_ptr;
|
|
if (iiter != &iiter_on_stack) {
|
|
iiter_unique_ptr =
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>>(iiter);
|
|
}
|
|
if (!iiter->status().ok()) {
|
|
// error opening index iterator
|
|
return iiter->status();
|
|
}
|
|
s = VerifyChecksumInBlocks(iiter);
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::VerifyChecksumInBlocks(
|
|
InternalIteratorBase<BlockHandle>* index_iter) {
|
|
Status s;
|
|
for (index_iter->SeekToFirst(); index_iter->Valid(); index_iter->Next()) {
|
|
s = index_iter->status();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
BlockHandle handle = index_iter->value();
|
|
BlockContents contents;
|
|
Slice dummy_comp_dict;
|
|
BlockFetcher block_fetcher(rep_->file.get(), nullptr /* prefetch buffer */,
|
|
rep_->footer, ReadOptions(), handle, &contents,
|
|
rep_->ioptions, false /* decompress */,
|
|
dummy_comp_dict /*compression dict*/,
|
|
rep_->persistent_cache_options);
|
|
s = block_fetcher.ReadBlockContents();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::VerifyChecksumInBlocks(
|
|
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;
|
|
Slice dummy_comp_dict;
|
|
BlockFetcher block_fetcher(rep_->file.get(), nullptr /* prefetch buffer */,
|
|
rep_->footer, ReadOptions(), handle, &contents,
|
|
rep_->ioptions, false /* decompress */,
|
|
dummy_comp_dict /*compression dict*/,
|
|
rep_->persistent_cache_options);
|
|
s = block_fetcher.ReadBlockContents();
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_KeyInCache(const ReadOptions& options,
|
|
const Slice& key) {
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> iiter(
|
|
NewIndexIterator(options));
|
|
iiter->Seek(key);
|
|
assert(iiter->Valid());
|
|
CachableEntry<Block> block;
|
|
|
|
BlockHandle handle = iiter->value();
|
|
Cache* block_cache = rep_->table_options.block_cache.get();
|
|
assert(block_cache != nullptr);
|
|
|
|
char cache_key_storage[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
Slice cache_key =
|
|
GetCacheKey(rep_->cache_key_prefix, rep_->cache_key_prefix_size, handle,
|
|
cache_key_storage);
|
|
Slice ckey;
|
|
|
|
Status s;
|
|
s = GetDataBlockFromCache(
|
|
cache_key, ckey, block_cache, nullptr, rep_->ioptions, options, &block,
|
|
rep_->table_options.format_version,
|
|
rep_->compression_dict_block ? rep_->compression_dict_block->data
|
|
: Slice(),
|
|
0 /* read_amp_bytes_per_bit */);
|
|
assert(s.ok());
|
|
bool in_cache = block.value != nullptr;
|
|
if (in_cache) {
|
|
ReleaseCachedEntry(block_cache, block.cache_handle);
|
|
}
|
|
return in_cache;
|
|
}
|
|
|
|
BlockBasedTableOptions::IndexType BlockBasedTable::UpdateIndexType() {
|
|
// Some old version of block-based tables don't have index type present in
|
|
// table properties. If that's the case we can safely use the kBinarySearch.
|
|
BlockBasedTableOptions::IndexType index_type_on_file =
|
|
BlockBasedTableOptions::kBinarySearch;
|
|
if (rep_->table_properties) {
|
|
auto& props = rep_->table_properties->user_collected_properties;
|
|
auto pos = props.find(BlockBasedTablePropertyNames::kIndexType);
|
|
if (pos != props.end()) {
|
|
index_type_on_file = static_cast<BlockBasedTableOptions::IndexType>(
|
|
DecodeFixed32(pos->second.c_str()));
|
|
// update index_type with the true type
|
|
rep_->index_type = index_type_on_file;
|
|
}
|
|
}
|
|
return index_type_on_file;
|
|
}
|
|
|
|
// 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(
|
|
FilePrefetchBuffer* prefetch_buffer, IndexReader** index_reader,
|
|
InternalIterator* preloaded_meta_index_iter, int level) {
|
|
auto index_type_on_file = UpdateIndexType();
|
|
|
|
auto file = rep_->file.get();
|
|
const InternalKeyComparator* icomparator = &rep_->internal_comparator;
|
|
const Footer& footer = rep_->footer;
|
|
|
|
// 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 (index_type_on_file) {
|
|
case BlockBasedTableOptions::kTwoLevelIndexSearch: {
|
|
return PartitionIndexReader::Create(
|
|
this, file, prefetch_buffer, footer, footer.index_handle(),
|
|
rep_->ioptions, icomparator, index_reader,
|
|
rep_->persistent_cache_options, level,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_key_is_user_key == 0,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_value_is_delta_encoded == 0);
|
|
}
|
|
case BlockBasedTableOptions::kBinarySearch: {
|
|
return BinarySearchIndexReader::Create(
|
|
file, prefetch_buffer, footer, footer.index_handle(), rep_->ioptions,
|
|
icomparator, index_reader, rep_->persistent_cache_options,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_key_is_user_key == 0,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_value_is_delta_encoded == 0);
|
|
}
|
|
case BlockBasedTableOptions::kHashSearch: {
|
|
std::unique_ptr<Block> meta_guard;
|
|
std::unique_ptr<InternalIterator> meta_iter_guard;
|
|
auto meta_index_iter = preloaded_meta_index_iter;
|
|
if (meta_index_iter == nullptr) {
|
|
auto s =
|
|
ReadMetaBlock(rep_, prefetch_buffer, &meta_guard, &meta_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.info_log,
|
|
"Unable to read the metaindex block."
|
|
" Fall back to binary search index.");
|
|
return BinarySearchIndexReader::Create(
|
|
file, prefetch_buffer, footer, footer.index_handle(),
|
|
rep_->ioptions, icomparator, index_reader,
|
|
rep_->persistent_cache_options,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_key_is_user_key == 0,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_value_is_delta_encoded == 0);
|
|
}
|
|
meta_index_iter = meta_iter_guard.get();
|
|
}
|
|
|
|
return HashIndexReader::Create(
|
|
rep_->internal_prefix_transform.get(), footer, file, prefetch_buffer,
|
|
rep_->ioptions, icomparator, footer.index_handle(), meta_index_iter,
|
|
index_reader, rep_->hash_index_allow_collision,
|
|
rep_->persistent_cache_options,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_key_is_user_key == 0,
|
|
rep_->table_properties == nullptr ||
|
|
rep_->table_properties->index_value_is_delta_encoded == 0);
|
|
}
|
|
default: {
|
|
std::string error_message =
|
|
"Unrecognized index type: " + ToString(index_type_on_file);
|
|
return Status::InvalidArgument(error_message.c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
uint64_t BlockBasedTable::ApproximateOffsetOf(const Slice& key) {
|
|
unique_ptr<InternalIteratorBase<BlockHandle>> index_iter(
|
|
NewIndexIterator(ReadOptions()));
|
|
|
|
index_iter->Seek(key);
|
|
uint64_t result;
|
|
if (index_iter->Valid()) {
|
|
BlockHandle handle = index_iter->value();
|
|
result = handle.offset();
|
|
} else {
|
|
// key is past the last key in the file. If table_properties is not
|
|
// available, approximate the offset by returning the offset of the
|
|
// metaindex block (which is right near the end of the file).
|
|
result = 0;
|
|
if (rep_->table_properties) {
|
|
result = rep_->table_properties->data_size;
|
|
}
|
|
// table_properties is not present in the table.
|
|
if (result == 0) {
|
|
result = rep_->footer.metaindex_handle().offset();
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_filter_block_preloaded() const {
|
|
return rep_->filter != nullptr;
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_index_reader_preloaded() const {
|
|
return rep_->index_reader != nullptr;
|
|
}
|
|
|
|
Status BlockBasedTable::GetKVPairsFromDataBlocks(
|
|
std::vector<KVPairBlock>* kv_pair_blocks) {
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions()));
|
|
|
|
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>(
|
|
rep_, ReadOptions(), blockhandles_iter->value()));
|
|
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,
|
|
const SliceTransform* prefix_extractor) {
|
|
// Output Footer
|
|
out_file->Append(
|
|
"Footer Details:\n"
|
|
"--------------------------------------\n"
|
|
" ");
|
|
out_file->Append(rep_->footer.ToString().c_str());
|
|
out_file->Append("\n");
|
|
|
|
// Output MetaIndex
|
|
out_file->Append(
|
|
"Metaindex Details:\n"
|
|
"--------------------------------------\n");
|
|
std::unique_ptr<Block> meta;
|
|
std::unique_ptr<InternalIterator> meta_iter;
|
|
Status s =
|
|
ReadMetaBlock(rep_, nullptr /* prefetch_buffer */, &meta, &meta_iter);
|
|
if (s.ok()) {
|
|
for (meta_iter->SeekToFirst(); meta_iter->Valid(); meta_iter->Next()) {
|
|
s = meta_iter->status();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (meta_iter->key() == rocksdb::kPropertiesBlock) {
|
|
out_file->Append(" Properties block handle: ");
|
|
out_file->Append(meta_iter->value().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
} else if (meta_iter->key() == rocksdb::kCompressionDictBlock) {
|
|
out_file->Append(" Compression dictionary block handle: ");
|
|
out_file->Append(meta_iter->value().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
} else if (strstr(meta_iter->key().ToString().c_str(),
|
|
"filter.rocksdb.") != nullptr) {
|
|
out_file->Append(" Filter block handle: ");
|
|
out_file->Append(meta_iter->value().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
} else if (meta_iter->key() == rocksdb::kRangeDelBlock) {
|
|
out_file->Append(" Range deletion block handle: ");
|
|
out_file->Append(meta_iter->value().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
}
|
|
}
|
|
out_file->Append("\n");
|
|
} else {
|
|
return s;
|
|
}
|
|
|
|
// Output TableProperties
|
|
const rocksdb::TableProperties* table_properties;
|
|
table_properties = rep_->table_properties.get();
|
|
|
|
if (table_properties != nullptr) {
|
|
out_file->Append(
|
|
"Table Properties:\n"
|
|
"--------------------------------------\n"
|
|
" ");
|
|
out_file->Append(table_properties->ToString("\n ", ": ").c_str());
|
|
out_file->Append("\n");
|
|
|
|
// Output Filter blocks
|
|
if (!rep_->filter && !table_properties->filter_policy_name.empty()) {
|
|
// Support only BloomFilter as off now
|
|
rocksdb::BlockBasedTableOptions table_options;
|
|
table_options.filter_policy.reset(rocksdb::NewBloomFilterPolicy(1));
|
|
if (table_properties->filter_policy_name.compare(
|
|
table_options.filter_policy->Name()) == 0) {
|
|
std::string filter_block_key = kFilterBlockPrefix;
|
|
filter_block_key.append(table_properties->filter_policy_name);
|
|
BlockHandle handle;
|
|
if (FindMetaBlock(meta_iter.get(), filter_block_key, &handle).ok()) {
|
|
BlockContents block;
|
|
Slice dummy_comp_dict;
|
|
BlockFetcher block_fetcher(
|
|
rep_->file.get(), nullptr /* prefetch_buffer */, rep_->footer,
|
|
ReadOptions(), handle, &block, rep_->ioptions,
|
|
false /*decompress*/, dummy_comp_dict /*compression dict*/,
|
|
rep_->persistent_cache_options);
|
|
s = block_fetcher.ReadBlockContents();
|
|
if (!s.ok()) {
|
|
rep_->filter.reset(new BlockBasedFilterBlockReader(
|
|
prefix_extractor, table_options,
|
|
table_options.whole_key_filtering, std::move(block),
|
|
rep_->ioptions.statistics));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (rep_->filter) {
|
|
out_file->Append(
|
|
"Filter Details:\n"
|
|
"--------------------------------------\n"
|
|
" ");
|
|
out_file->Append(rep_->filter->ToString().c_str());
|
|
out_file->Append("\n");
|
|
}
|
|
|
|
// Output Index block
|
|
s = DumpIndexBlock(out_file);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// Output compression dictionary
|
|
if (rep_->compression_dict_block != nullptr) {
|
|
auto compression_dict = rep_->compression_dict_block->data;
|
|
out_file->Append(
|
|
"Compression Dictionary:\n"
|
|
"--------------------------------------\n");
|
|
out_file->Append(" size (bytes): ");
|
|
out_file->Append(rocksdb::ToString(compression_dict.size()));
|
|
out_file->Append("\n\n");
|
|
out_file->Append(" HEX ");
|
|
out_file->Append(compression_dict.ToString(true).c_str());
|
|
out_file->Append("\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_file->Append(
|
|
"Range deletions:\n"
|
|
"--------------------------------------\n"
|
|
" ");
|
|
for (; range_del_iter->Valid(); range_del_iter->Next()) {
|
|
DumpKeyValue(range_del_iter->key(), range_del_iter->value(), out_file);
|
|
}
|
|
out_file->Append("\n");
|
|
}
|
|
delete range_del_iter;
|
|
}
|
|
// Output Data blocks
|
|
s = DumpDataBlocks(out_file);
|
|
|
|
return s;
|
|
}
|
|
|
|
void BlockBasedTable::Close() {
|
|
if (rep_->closed) {
|
|
return;
|
|
}
|
|
rep_->filter_entry.Release(rep_->table_options.block_cache.get());
|
|
rep_->index_entry.Release(rep_->table_options.block_cache.get());
|
|
rep_->range_del_entry.Release(rep_->table_options.block_cache.get());
|
|
// cleanup index and filter blocks to avoid accessing dangling pointer
|
|
if (!rep_->table_options.no_block_cache) {
|
|
char cache_key[kMaxCacheKeyPrefixSize + kMaxVarint64Length];
|
|
// Get the filter block key
|
|
auto key = GetCacheKey(rep_->cache_key_prefix, rep_->cache_key_prefix_size,
|
|
rep_->filter_handle, cache_key);
|
|
rep_->table_options.block_cache.get()->Erase(key);
|
|
// Get the index block key
|
|
key = GetCacheKeyFromOffset(rep_->cache_key_prefix,
|
|
rep_->cache_key_prefix_size,
|
|
rep_->dummy_index_reader_offset, cache_key);
|
|
rep_->table_options.block_cache.get()->Erase(key);
|
|
}
|
|
rep_->closed = true;
|
|
}
|
|
|
|
Status BlockBasedTable::DumpIndexBlock(WritableFile* out_file) {
|
|
out_file->Append(
|
|
"Index Details:\n"
|
|
"--------------------------------------\n");
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions()));
|
|
Status s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
out_file->Append("Can not read Index Block \n\n");
|
|
return s;
|
|
}
|
|
|
|
out_file->Append(" Block key hex dump: Data block handle\n");
|
|
out_file->Append(" 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_->table_properties &&
|
|
rep_->table_properties->index_key_is_user_key != 0) {
|
|
user_key = key;
|
|
} else {
|
|
ikey.DecodeFrom(key);
|
|
user_key = ikey.user_key();
|
|
}
|
|
|
|
out_file->Append(" HEX ");
|
|
out_file->Append(user_key.ToString(true).c_str());
|
|
out_file->Append(": ");
|
|
out_file->Append(blockhandles_iter->value().ToString(true).c_str());
|
|
out_file->Append("\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_file->Append(" ASCII ");
|
|
out_file->Append(res_key.c_str());
|
|
out_file->Append("\n ------\n");
|
|
}
|
|
out_file->Append("\n");
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlockBasedTable::DumpDataBlocks(WritableFile* out_file) {
|
|
std::unique_ptr<InternalIteratorBase<BlockHandle>> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions()));
|
|
Status s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
out_file->Append("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();
|
|
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_file->Append("Data Block # ");
|
|
out_file->Append(rocksdb::ToString(block_id));
|
|
out_file->Append(" @ ");
|
|
out_file->Append(blockhandles_iter->value().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
out_file->Append("--------------------------------------\n");
|
|
|
|
std::unique_ptr<InternalIterator> datablock_iter;
|
|
datablock_iter.reset(NewDataBlockIterator<DataBlockIter>(
|
|
rep_, ReadOptions(), blockhandles_iter->value()));
|
|
s = datablock_iter->status();
|
|
|
|
if (!s.ok()) {
|
|
out_file->Append("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_file->Append("Error reading the block - Skipped \n");
|
|
break;
|
|
}
|
|
DumpKeyValue(datablock_iter->key(), datablock_iter->value(), out_file);
|
|
}
|
|
out_file->Append("\n");
|
|
}
|
|
|
|
uint64_t num_datablocks = block_id - 1;
|
|
if (num_datablocks) {
|
|
double datablock_size_avg =
|
|
static_cast<double>(datablock_size_sum) / num_datablocks;
|
|
out_file->Append("Data Block Summary:\n");
|
|
out_file->Append("--------------------------------------");
|
|
out_file->Append("\n # data blocks: ");
|
|
out_file->Append(rocksdb::ToString(num_datablocks));
|
|
out_file->Append("\n min data block size: ");
|
|
out_file->Append(rocksdb::ToString(datablock_size_min));
|
|
out_file->Append("\n max data block size: ");
|
|
out_file->Append(rocksdb::ToString(datablock_size_max));
|
|
out_file->Append("\n avg data block size: ");
|
|
out_file->Append(rocksdb::ToString(datablock_size_avg));
|
|
out_file->Append("\n");
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
void BlockBasedTable::DumpKeyValue(const Slice& key, const Slice& value,
|
|
WritableFile* out_file) {
|
|
InternalKey ikey;
|
|
ikey.DecodeFrom(key);
|
|
|
|
out_file->Append(" HEX ");
|
|
out_file->Append(ikey.user_key().ToString(true).c_str());
|
|
out_file->Append(": ");
|
|
out_file->Append(value.ToString(true).c_str());
|
|
out_file->Append("\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_file->Append(" ASCII ");
|
|
out_file->Append(res_key.c_str());
|
|
out_file->Append(": ");
|
|
out_file->Append(res_value.c_str());
|
|
out_file->Append("\n ------\n");
|
|
}
|
|
|
|
namespace {
|
|
|
|
void DeleteCachedFilterEntry(const Slice& /*key*/, void* value) {
|
|
FilterBlockReader* filter = reinterpret_cast<FilterBlockReader*>(value);
|
|
if (filter->statistics() != nullptr) {
|
|
RecordTick(filter->statistics(), BLOCK_CACHE_FILTER_BYTES_EVICT,
|
|
filter->ApproximateMemoryUsage());
|
|
}
|
|
delete filter;
|
|
}
|
|
|
|
void DeleteCachedIndexEntry(const Slice& /*key*/, void* value) {
|
|
IndexReader* index_reader = reinterpret_cast<IndexReader*>(value);
|
|
if (index_reader->statistics() != nullptr) {
|
|
RecordTick(index_reader->statistics(), BLOCK_CACHE_INDEX_BYTES_EVICT,
|
|
index_reader->ApproximateMemoryUsage());
|
|
}
|
|
delete index_reader;
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
} // namespace rocksdb
|