mirror of https://github.com/facebook/rocksdb.git
123 lines
4.0 KiB
C++
123 lines
4.0 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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#include "table/block_based/uncompression_dict_reader.h"
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#include "logging/logging.h"
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#include "monitoring/perf_context_imp.h"
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#include "table/block_based/block_based_table_reader.h"
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#include "util/compression.h"
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namespace ROCKSDB_NAMESPACE {
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Status UncompressionDictReader::Create(
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const BlockBasedTable* table, const ReadOptions& ro,
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FilePrefetchBuffer* prefetch_buffer, bool use_cache, bool prefetch,
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bool pin, BlockCacheLookupContext* lookup_context,
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std::unique_ptr<UncompressionDictReader>* uncompression_dict_reader) {
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assert(table);
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assert(table->get_rep());
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assert(!pin || prefetch);
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assert(uncompression_dict_reader);
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CachableEntry<UncompressionDict> uncompression_dict;
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if (prefetch || !use_cache) {
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const Status s = ReadUncompressionDictionary(
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table, prefetch_buffer, ro, use_cache, nullptr /* get_context */,
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lookup_context, &uncompression_dict);
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if (!s.ok()) {
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return s;
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}
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if (use_cache && !pin) {
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uncompression_dict.Reset();
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}
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}
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uncompression_dict_reader->reset(
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new UncompressionDictReader(table, std::move(uncompression_dict)));
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return Status::OK();
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}
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Status UncompressionDictReader::ReadUncompressionDictionary(
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const BlockBasedTable* table, FilePrefetchBuffer* prefetch_buffer,
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const ReadOptions& read_options, bool use_cache, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<UncompressionDict>* uncompression_dict) {
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// TODO: add perf counter for compression dictionary read time
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assert(table);
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assert(uncompression_dict);
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assert(uncompression_dict->IsEmpty());
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const BlockBasedTable::Rep* const rep = table->get_rep();
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assert(rep);
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assert(!rep->compression_dict_handle.IsNull());
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const Status s = table->RetrieveBlock(
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prefetch_buffer, read_options, rep->compression_dict_handle,
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UncompressionDict::GetEmptyDict(), uncompression_dict,
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BlockType::kCompressionDictionary, get_context, lookup_context,
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/* for_compaction */ false, use_cache, /* wait_for_cache */ true);
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if (!s.ok()) {
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ROCKS_LOG_WARN(
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rep->ioptions.logger,
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"Encountered error while reading data from compression dictionary "
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"block %s",
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s.ToString().c_str());
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}
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return s;
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}
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Status UncompressionDictReader::GetOrReadUncompressionDictionary(
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FilePrefetchBuffer* prefetch_buffer, bool no_io, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<UncompressionDict>* uncompression_dict) const {
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assert(uncompression_dict);
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if (!uncompression_dict_.IsEmpty()) {
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uncompression_dict->SetUnownedValue(uncompression_dict_.GetValue());
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return Status::OK();
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}
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ReadOptions read_options;
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if (no_io) {
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read_options.read_tier = kBlockCacheTier;
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}
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return ReadUncompressionDictionary(table_, prefetch_buffer, read_options,
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cache_dictionary_blocks(), get_context,
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lookup_context, uncompression_dict);
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}
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size_t UncompressionDictReader::ApproximateMemoryUsage() const {
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assert(!uncompression_dict_.GetOwnValue() ||
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uncompression_dict_.GetValue() != nullptr);
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size_t usage = uncompression_dict_.GetOwnValue()
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? uncompression_dict_.GetValue()->ApproximateMemoryUsage()
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: 0;
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#ifdef ROCKSDB_MALLOC_USABLE_SIZE
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usage += malloc_usable_size(const_cast<UncompressionDictReader*>(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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bool UncompressionDictReader::cache_dictionary_blocks() const {
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assert(table_);
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assert(table_->get_rep());
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return table_->get_rep()->table_options.cache_index_and_filter_blocks;
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}
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} // namespace ROCKSDB_NAMESPACE
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