fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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626 lines
21 KiB
626 lines
21 KiB
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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_builder.h"
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#include <assert.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <map>
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#include <memory>
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#include "db/dbformat.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/flush_block_policy.h"
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#include "rocksdb/options.h"
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#include "rocksdb/table.h"
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#include "table/block.h"
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#include "table/block_based_table_reader.h"
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#include "table/block_builder.h"
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#include "table/filter_block.h"
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#include "table/format.h"
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#include "table/meta_blocks.h"
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#include "table/table_builder.h"
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#include "util/coding.h"
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#include "util/crc32c.h"
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#include "util/stop_watch.h"
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namespace rocksdb {
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namespace {
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typedef BlockBasedTableOptions::IndexType IndexType;
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// The interface for building index.
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// Instruction for adding a new concrete IndexBuilder:
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// 1. Create a subclass instantiated from IndexBuilder.
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// 2. Add a new entry associated with that subclass in TableOptions::IndexType.
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// 3. Add a create function for the new subclass in CreateIndexBuilder.
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// Note: we can devise more advanced design to simplify the process for adding
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// new subclass, which will, on the other hand, increase the code complexity and
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// catch unwanted attention from readers. Given that we won't add/change
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// indexes frequently, it makes sense to just embrace a more straightforward
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// design that just works.
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class IndexBuilder {
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public:
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explicit IndexBuilder(const Comparator* comparator)
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: comparator_(comparator) {}
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virtual ~IndexBuilder() {}
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// Add a new index entry to index block.
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// To allow further optimization, we provide `last_key_in_current_block` and
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// `first_key_in_next_block`, based on which the specific implementation can
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// determine the best index key to be used for the index block.
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// @last_key_in_current_block: this parameter maybe overridden with the value
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// "substitute key".
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// @first_key_in_next_block: it will be nullptr if the entry being added is
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// the last one in the table
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//
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// REQUIRES: Finish() has not yet been called.
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virtual void AddEntry(std::string* last_key_in_current_block,
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const Slice* first_key_in_next_block,
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const BlockHandle& block_handle) = 0;
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// Inform the index builder that all entries has been written. Block builder
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// may therefore perform any operation required for block finalization.
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//
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// REQUIRES: Finish() has not yet been called.
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virtual Slice Finish() = 0;
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// Get the estimated size for index block.
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virtual size_t EstimatedSize() const = 0;
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protected:
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const Comparator* comparator_;
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};
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// This index builder builds space-efficient index block for binary-search-based
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// index.
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//
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// Optimizations:
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// 1. Made block's `block_restart_interval` to be 1, which will avoid linear
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// search when doing index lookup.
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// 2. Shorten the key length for index block. Other than honestly using the
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// last key in the data block as the index key, we instead find a shortest
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// substitute key that serves the same function.
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class BinarySearchIndexBuilder : public IndexBuilder {
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public:
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explicit BinarySearchIndexBuilder(const Comparator* comparator)
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: IndexBuilder(comparator),
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index_block_builder_(1 /* block_restart_interval == 1 */, comparator) {}
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virtual void AddEntry(std::string* last_key_in_current_block,
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const Slice* first_key_in_next_block,
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const BlockHandle& block_handle) override {
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if (first_key_in_next_block != nullptr) {
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comparator_->FindShortestSeparator(last_key_in_current_block,
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*first_key_in_next_block);
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} else {
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comparator_->FindShortSuccessor(last_key_in_current_block);
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}
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std::string handle_encoding;
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block_handle.EncodeTo(&handle_encoding);
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index_block_builder_.Add(*last_key_in_current_block, handle_encoding);
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}
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virtual Slice Finish() override { return index_block_builder_.Finish(); }
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virtual size_t EstimatedSize() const {
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return index_block_builder_.CurrentSizeEstimate();
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}
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private:
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BlockBuilder index_block_builder_;
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};
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// Create a index builder based on its type.
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IndexBuilder* CreateIndexBuilder(IndexType type, const Comparator* comparator) {
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switch (type) {
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case BlockBasedTableOptions::kBinarySearch: {
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return new BinarySearchIndexBuilder(comparator);
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}
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default: {
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assert(!"Do not recognize the index type ");
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return nullptr;
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}
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}
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// impossible.
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assert(false);
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return nullptr;
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}
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bool GoodCompressionRatio(size_t compressed_size, size_t raw_size) {
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// Check to see if compressed less than 12.5%
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return compressed_size < raw_size - (raw_size / 8u);
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}
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Slice CompressBlock(const Slice& raw,
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const CompressionOptions& compression_options,
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CompressionType* type, std::string* compressed_output) {
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if (*type == kNoCompression) {
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return raw;
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}
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// Will return compressed block contents if (1) the compression method is
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// supported in this platform and (2) the compression rate is "good enough".
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switch (*type) {
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case kSnappyCompression:
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if (port::Snappy_Compress(compression_options, raw.data(), raw.size(),
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compressed_output) &&
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GoodCompressionRatio(compressed_output->size(), raw.size())) {
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return *compressed_output;
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}
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break; // fall back to no compression.
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case kZlibCompression:
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if (port::Zlib_Compress(compression_options, raw.data(), raw.size(),
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compressed_output) &&
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GoodCompressionRatio(compressed_output->size(), raw.size())) {
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return *compressed_output;
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}
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break; // fall back to no compression.
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case kBZip2Compression:
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if (port::BZip2_Compress(compression_options, raw.data(), raw.size(),
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compressed_output) &&
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GoodCompressionRatio(compressed_output->size(), raw.size())) {
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return *compressed_output;
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}
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break; // fall back to no compression.
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case kLZ4Compression:
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if (port::LZ4_Compress(compression_options, raw.data(), raw.size(),
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compressed_output) &&
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GoodCompressionRatio(compressed_output->size(), raw.size())) {
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return *compressed_output;
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}
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break; // fall back to no compression.
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case kLZ4HCCompression:
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if (port::LZ4HC_Compress(compression_options, raw.data(), raw.size(),
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compressed_output) &&
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GoodCompressionRatio(compressed_output->size(), raw.size())) {
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return *compressed_output;
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}
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break; // fall back to no compression.
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default: {} // Do not recognize this compression type
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}
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// Compression method is not supported, or not good compression ratio, so just
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// fall back to uncompressed form.
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*type = kNoCompression;
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return raw;
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}
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} // anonymous namespace
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// kBlockBasedTableMagicNumber was picked by running
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// echo http://code.google.com/p/leveldb/ | sha1sum
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// and taking the leading 64 bits.
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// Please note that kBlockBasedTableMagicNumber may also be accessed by
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// other .cc files so it have to be explicitly declared with "extern".
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extern const uint64_t kBlockBasedTableMagicNumber
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= 0xdb4775248b80fb57ull;
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// A collector that collects properties of interest to block-based table.
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// For now this class looks heavy-weight since we only write one additional
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// property.
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// But in the forseeable future, we will add more and more properties that are
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// specific to block-based table.
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class BlockBasedTableBuilder::BlockBasedTablePropertiesCollector
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: public TablePropertiesCollector {
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public:
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BlockBasedTablePropertiesCollector(
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BlockBasedTableOptions::IndexType index_type)
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: index_type_(index_type) {}
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virtual Status Add(const Slice& key, const Slice& value) {
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// Intentionally left blank. Have no interest in collecting stats for
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// individual key/value pairs.
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return Status::OK();
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}
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virtual Status Finish(UserCollectedProperties* properties) {
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std::string val;
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PutFixed32(&val, static_cast<uint32_t>(index_type_));
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properties->insert({BlockBasedTablePropertyNames::kIndexType, val});
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return Status::OK();
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}
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// The name of the properties collector can be used for debugging purpose.
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virtual const char* Name() const {
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return "BlockBasedTablePropertiesCollector";
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}
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virtual UserCollectedProperties GetReadableProperties() const {
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// Intentionally left blank.
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return UserCollectedProperties();
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}
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private:
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BlockBasedTableOptions::IndexType index_type_;
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};
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struct BlockBasedTableBuilder::Rep {
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Options options;
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const InternalKeyComparator& internal_comparator;
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WritableFile* file;
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uint64_t offset = 0;
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Status status;
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BlockBuilder data_block;
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std::unique_ptr<IndexBuilder> index_builder;
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std::string last_key;
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CompressionType compression_type;
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TableProperties props;
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bool closed = false; // Either Finish() or Abandon() has been called.
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FilterBlockBuilder* filter_block;
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char compressed_cache_key_prefix[BlockBasedTable::kMaxCacheKeyPrefixSize];
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size_t compressed_cache_key_prefix_size;
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BlockHandle pending_handle; // Handle to add to index block
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std::string compressed_output;
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std::unique_ptr<FlushBlockPolicy> flush_block_policy;
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Rep(const Options& opt, const InternalKeyComparator& icomparator,
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WritableFile* f, FlushBlockPolicyFactory* flush_block_policy_factory,
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CompressionType compression_type, IndexType index_block_type)
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: options(opt),
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internal_comparator(icomparator),
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file(f),
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data_block(options, &internal_comparator),
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index_builder(
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CreateIndexBuilder(index_block_type, &internal_comparator)),
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compression_type(compression_type),
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filter_block(opt.filter_policy == nullptr
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? nullptr
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: new FilterBlockBuilder(opt, &internal_comparator)),
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flush_block_policy(flush_block_policy_factory->NewFlushBlockPolicy(
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options, data_block)) {
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options.table_properties_collectors.push_back(
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std::make_shared<BlockBasedTablePropertiesCollector>(index_block_type));
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}
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};
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BlockBasedTableBuilder::BlockBasedTableBuilder(
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const Options& options, const BlockBasedTableOptions& table_options,
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const InternalKeyComparator& internal_comparator, WritableFile* file,
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CompressionType compression_type)
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: rep_(new Rep(options, internal_comparator, file,
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table_options.flush_block_policy_factory.get(),
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compression_type, table_options.index_type)) {
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if (rep_->filter_block != nullptr) {
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rep_->filter_block->StartBlock(0);
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}
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if (options.block_cache_compressed.get() != nullptr) {
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BlockBasedTable::GenerateCachePrefix(
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options.block_cache_compressed.get(), file,
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&rep_->compressed_cache_key_prefix[0],
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&rep_->compressed_cache_key_prefix_size);
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}
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}
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BlockBasedTableBuilder::~BlockBasedTableBuilder() {
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assert(rep_->closed); // Catch errors where caller forgot to call Finish()
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delete rep_->filter_block;
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delete rep_;
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}
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void BlockBasedTableBuilder::Add(const Slice& key, const Slice& value) {
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Rep* r = rep_;
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assert(!r->closed);
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if (!ok()) return;
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if (r->props.num_entries > 0) {
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assert(r->internal_comparator.Compare(key, Slice(r->last_key)) > 0);
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}
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auto should_flush = r->flush_block_policy->Update(key, value);
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if (should_flush) {
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assert(!r->data_block.empty());
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Flush();
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// Add item to index block.
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// We do not emit the index entry for a block until we have seen the
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// first key for the next data block. This allows us to use shorter
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// keys in the index block. For example, consider a block boundary
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// between the keys "the quick brown fox" and "the who". We can use
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// "the r" as the key for the index block entry since it is >= all
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// entries in the first block and < all entries in subsequent
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// blocks.
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if (ok()) {
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r->index_builder->AddEntry(&r->last_key, &key, r->pending_handle);
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}
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}
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if (r->filter_block != nullptr) {
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r->filter_block->AddKey(key);
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}
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r->last_key.assign(key.data(), key.size());
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r->data_block.Add(key, value);
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r->props.num_entries++;
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r->props.raw_key_size += key.size();
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r->props.raw_value_size += value.size();
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NotifyCollectTableCollectorsOnAdd(
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key,
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value,
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r->options.table_properties_collectors,
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r->options.info_log.get()
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);
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}
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void BlockBasedTableBuilder::Flush() {
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Rep* r = rep_;
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assert(!r->closed);
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if (!ok()) return;
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if (r->data_block.empty()) return;
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WriteBlock(&r->data_block, &r->pending_handle);
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if (ok()) {
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r->status = r->file->Flush();
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}
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if (r->filter_block != nullptr) {
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r->filter_block->StartBlock(r->offset);
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}
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r->props.data_size = r->offset;
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++r->props.num_data_blocks;
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}
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void BlockBasedTableBuilder::WriteBlock(BlockBuilder* block,
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BlockHandle* handle) {
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WriteBlock(block->Finish(), handle);
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block->Reset();
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}
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void BlockBasedTableBuilder::WriteBlock(const Slice& raw_block_contents,
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BlockHandle* handle) {
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// File format contains a sequence of blocks where each block has:
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// block_data: uint8[n]
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// type: uint8
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// crc: uint32
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assert(ok());
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Rep* r = rep_;
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auto type = r->compression_type;
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auto block_contents =
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CompressBlock(raw_block_contents, r->options.compression_opts, &type,
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&r->compressed_output);
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WriteRawBlock(block_contents, type, handle);
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r->compressed_output.clear();
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}
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void BlockBasedTableBuilder::WriteRawBlock(const Slice& block_contents,
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CompressionType type,
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BlockHandle* handle) {
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Rep* r = rep_;
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StopWatch sw(r->options.env, r->options.statistics.get(),
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WRITE_RAW_BLOCK_MICROS);
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handle->set_offset(r->offset);
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handle->set_size(block_contents.size());
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r->status = r->file->Append(block_contents);
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if (r->status.ok()) {
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char trailer[kBlockTrailerSize];
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trailer[0] = type;
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uint32_t crc = crc32c::Value(block_contents.data(), block_contents.size());
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crc = crc32c::Extend(crc, trailer, 1); // Extend crc to cover block type
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EncodeFixed32(trailer+1, crc32c::Mask(crc));
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r->status = r->file->Append(Slice(trailer, kBlockTrailerSize));
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if (r->status.ok()) {
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r->status = InsertBlockInCache(block_contents, type, handle);
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}
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if (r->status.ok()) {
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r->offset += block_contents.size() + kBlockTrailerSize;
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}
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}
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}
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Status BlockBasedTableBuilder::status() const {
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return rep_->status;
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}
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static void DeleteCachedBlock(const Slice& key, void* value) {
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Block* block = reinterpret_cast<Block*>(value);
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delete block;
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}
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//
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// Make a copy of the block contents and insert into compressed block cache
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//
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Status BlockBasedTableBuilder::InsertBlockInCache(const Slice& block_contents,
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const CompressionType type,
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const BlockHandle* handle) {
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Rep* r = rep_;
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Cache* block_cache_compressed = r->options.block_cache_compressed.get();
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if (type != kNoCompression && block_cache_compressed != nullptr) {
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Cache::Handle* cache_handle = nullptr;
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size_t size = block_contents.size();
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char* ubuf = new char[size]; // make a new copy
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memcpy(ubuf, block_contents.data(), size);
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BlockContents results;
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Slice sl(ubuf, size);
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results.data = sl;
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results.cachable = true; // XXX
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results.heap_allocated = true;
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results.compression_type = type;
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Block* block = new Block(results);
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// make cache key by appending the file offset to the cache prefix id
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char* end = EncodeVarint64(
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r->compressed_cache_key_prefix +
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r->compressed_cache_key_prefix_size,
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handle->offset());
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Slice key(r->compressed_cache_key_prefix, static_cast<size_t>
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(end - r->compressed_cache_key_prefix));
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// Insert into compressed block cache.
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cache_handle = block_cache_compressed->Insert(key, block, block->size(),
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&DeleteCachedBlock);
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block_cache_compressed->Release(cache_handle);
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// Invalidate OS cache.
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r->file->InvalidateCache(r->offset, size);
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}
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return Status::OK();
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}
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Status BlockBasedTableBuilder::Finish() {
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Rep* r = rep_;
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bool empty_data_block = r->data_block.empty();
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Flush();
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assert(!r->closed);
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r->closed = true;
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BlockHandle filter_block_handle,
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metaindex_block_handle,
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index_block_handle;
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// Write filter block
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if (ok() && r->filter_block != nullptr) {
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auto filter_contents = r->filter_block->Finish();
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r->props.filter_size = filter_contents.size();
|
|
WriteRawBlock(filter_contents, kNoCompression, &filter_block_handle);
|
|
}
|
|
|
|
// To make sure properties block is able to keep the accurate size of index
|
|
// block, we will finish writing all index entries here and flush them
|
|
// to storage after metaindex block is written.
|
|
if (ok() && !empty_data_block) {
|
|
r->index_builder->AddEntry(&r->last_key, nullptr /* no next data block */,
|
|
r->pending_handle);
|
|
}
|
|
|
|
// Write meta blocks and metaindex block with the following order.
|
|
// 1. [meta block: filter]
|
|
// 2. [meta block: properties]
|
|
// 3. [metaindex block]
|
|
if (ok()) {
|
|
MetaIndexBuilder meta_index_builer;
|
|
|
|
// Write filter block.
|
|
if (r->filter_block != nullptr) {
|
|
// Add mapping from "<filter_block_prefix>.Name" to location
|
|
// of filter data.
|
|
std::string key = BlockBasedTable::kFilterBlockPrefix;
|
|
key.append(r->options.filter_policy->Name());
|
|
meta_index_builer.Add(key, filter_block_handle);
|
|
}
|
|
|
|
// Write properties block.
|
|
{
|
|
PropertyBlockBuilder property_block_builder;
|
|
std::vector<std::string> failed_user_prop_collectors;
|
|
r->props.filter_policy_name = r->options.filter_policy != nullptr ?
|
|
r->options.filter_policy->Name() : "";
|
|
r->props.index_size =
|
|
r->index_builder->EstimatedSize() + kBlockTrailerSize;
|
|
|
|
// Add basic properties
|
|
property_block_builder.AddTableProperty(r->props);
|
|
|
|
// Add use collected properties
|
|
NotifyCollectTableCollectorsOnFinish(
|
|
r->options.table_properties_collectors,
|
|
r->options.info_log.get(),
|
|
&property_block_builder
|
|
);
|
|
|
|
BlockHandle properties_block_handle;
|
|
WriteRawBlock(
|
|
property_block_builder.Finish(),
|
|
kNoCompression,
|
|
&properties_block_handle
|
|
);
|
|
|
|
meta_index_builer.Add(kPropertiesBlock,
|
|
properties_block_handle);
|
|
} // end of properties block writing
|
|
|
|
WriteRawBlock(
|
|
meta_index_builer.Finish(),
|
|
kNoCompression,
|
|
&metaindex_block_handle
|
|
);
|
|
} // meta blocks and metaindex block.
|
|
|
|
// Write index block
|
|
if (ok()) {
|
|
WriteBlock(r->index_builder->Finish(), &index_block_handle);
|
|
}
|
|
|
|
// Write footer
|
|
if (ok()) {
|
|
Footer footer(kBlockBasedTableMagicNumber);
|
|
footer.set_metaindex_handle(metaindex_block_handle);
|
|
footer.set_index_handle(index_block_handle);
|
|
std::string footer_encoding;
|
|
footer.EncodeTo(&footer_encoding);
|
|
r->status = r->file->Append(footer_encoding);
|
|
if (r->status.ok()) {
|
|
r->offset += footer_encoding.size();
|
|
}
|
|
}
|
|
|
|
// Print out the table stats
|
|
if (ok()) {
|
|
// user collected properties
|
|
std::string user_collected;
|
|
user_collected.reserve(1024);
|
|
for (auto collector : r->options.table_properties_collectors) {
|
|
for (const auto& prop : collector->GetReadableProperties()) {
|
|
user_collected.append(prop.first);
|
|
user_collected.append("=");
|
|
user_collected.append(prop.second);
|
|
user_collected.append("; ");
|
|
}
|
|
}
|
|
|
|
Log(
|
|
r->options.info_log,
|
|
"Table was constructed:\n"
|
|
" [basic properties]: %s\n"
|
|
" [user collected properties]: %s",
|
|
r->props.ToString().c_str(),
|
|
user_collected.c_str()
|
|
);
|
|
}
|
|
|
|
return r->status;
|
|
}
|
|
|
|
void BlockBasedTableBuilder::Abandon() {
|
|
Rep* r = rep_;
|
|
assert(!r->closed);
|
|
r->closed = true;
|
|
}
|
|
|
|
uint64_t BlockBasedTableBuilder::NumEntries() const {
|
|
return rep_->props.num_entries;
|
|
}
|
|
|
|
uint64_t BlockBasedTableBuilder::FileSize() const {
|
|
return rep_->offset;
|
|
}
|
|
|
|
const std::string BlockBasedTable::kFilterBlockPrefix =
|
|
"filter.";
|
|
|
|
} // namespace rocksdb
|
|
|