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@ -11,23 +11,29 @@ |
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#include <assert.h> |
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#include <inttypes.h> |
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#include <map> |
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#include <stdio.h> |
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#include "rocksdb/flush_block_policy.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 "table/table_builder.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 "db/dbformat.h" |
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#include "table/block_based_table_reader.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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@ -36,11 +42,167 @@ namespace rocksdb { |
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namespace { |
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static bool GoodCompressionRatio(size_t compressed_size, size_t raw_size) { |
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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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@ -51,6 +213,46 @@ static bool GoodCompressionRatio(size_t compressed_size, size_t raw_size) { |
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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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@ -58,7 +260,8 @@ struct BlockBasedTableBuilder::Rep { |
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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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BlockBuilder index_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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@ -75,28 +278,31 @@ struct BlockBasedTableBuilder::Rep { |
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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) |
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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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// To avoid linear scan, we make the block_restart_interval to be `1`
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// in index block builder
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index_block(1 /* block_restart_interval */, &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( |
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flush_block_policy_factory->NewFlushBlockPolicy(data_block)) {} |
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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 InternalKeyComparator& internal_comparator, |
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WritableFile* file, FlushBlockPolicyFactory* flush_block_policy_factory, |
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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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flush_block_policy_factory, compression_type)) { |
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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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@ -136,10 +342,7 @@ void BlockBasedTableBuilder::Add(const Slice& key, const Slice& value) { |
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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->internal_comparator.FindShortestSeparator(&r->last_key, key); |
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std::string handle_encoding; |
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r->pending_handle.EncodeTo(&handle_encoding); |
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r->index_block.Add(r->last_key, Slice(handle_encoding)); |
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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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@ -179,88 +382,25 @@ void BlockBasedTableBuilder::Flush() { |
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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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Slice raw = block->Finish(); |
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Slice block_contents; |
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std::string* compressed = &r->compressed_output; |
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CompressionType type = r->compression_type; |
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switch (type) { |
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case kNoCompression: |
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block_contents = raw; |
|
|
|
|
break; |
|
|
|
|
|
|
|
|
|
case kSnappyCompression: { |
|
|
|
|
std::string* compressed = &r->compressed_output; |
|
|
|
|
if (port::Snappy_Compress(r->options.compression_opts, raw.data(), |
|
|
|
|
raw.size(), compressed) && |
|
|
|
|
GoodCompressionRatio(compressed->size(), raw.size())) { |
|
|
|
|
block_contents = *compressed; |
|
|
|
|
} else { |
|
|
|
|
// Snappy not supported, or not good compression ratio, so just
|
|
|
|
|
// store uncompressed form
|
|
|
|
|
block_contents = raw; |
|
|
|
|
type = kNoCompression; |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
case kZlibCompression: |
|
|
|
|
if (port::Zlib_Compress(r->options.compression_opts, raw.data(), |
|
|
|
|
raw.size(), compressed) && |
|
|
|
|
GoodCompressionRatio(compressed->size(), raw.size())) { |
|
|
|
|
block_contents = *compressed; |
|
|
|
|
} else { |
|
|
|
|
// Zlib not supported, or not good compression ratio, so just
|
|
|
|
|
// store uncompressed form
|
|
|
|
|
block_contents = raw; |
|
|
|
|
type = kNoCompression; |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
case kBZip2Compression: |
|
|
|
|
if (port::BZip2_Compress(r->options.compression_opts, raw.data(), |
|
|
|
|
raw.size(), compressed) && |
|
|
|
|
GoodCompressionRatio(compressed->size(), raw.size())) { |
|
|
|
|
block_contents = *compressed; |
|
|
|
|
} else { |
|
|
|
|
// BZip not supported, or not good compression ratio, so just
|
|
|
|
|
// store uncompressed form
|
|
|
|
|
block_contents = raw; |
|
|
|
|
type = kNoCompression; |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
case kLZ4Compression: |
|
|
|
|
if (port::LZ4_Compress(r->options.compression_opts, raw.data(), |
|
|
|
|
raw.size(), compressed) && |
|
|
|
|
GoodCompressionRatio(compressed->size(), raw.size())) { |
|
|
|
|
block_contents = *compressed; |
|
|
|
|
} else { |
|
|
|
|
// LZ4 not supported, or not good compression ratio, so just
|
|
|
|
|
// store uncompressed form
|
|
|
|
|
block_contents = raw; |
|
|
|
|
type = kNoCompression; |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
case kLZ4HCCompression: |
|
|
|
|
if (port::LZ4HC_Compress(r->options.compression_opts, raw.data(), |
|
|
|
|
raw.size(), compressed) && |
|
|
|
|
GoodCompressionRatio(compressed->size(), raw.size())) { |
|
|
|
|
block_contents = *compressed; |
|
|
|
|
} else { |
|
|
|
|
// LZ4 not supported, or not good compression ratio, so just
|
|
|
|
|
// store uncompressed form
|
|
|
|
|
block_contents = raw; |
|
|
|
|
type = kNoCompression; |
|
|
|
|
} |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
auto type = r->compression_type; |
|
|
|
|
auto block_contents = |
|
|
|
|
CompressBlock(raw_block_contents, r->options.compression_opts, &type, |
|
|
|
|
&r->compressed_output); |
|
|
|
|
WriteRawBlock(block_contents, type, handle); |
|
|
|
|
r->compressed_output.clear(); |
|
|
|
|
block->Reset(); |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
void BlockBasedTableBuilder::WriteRawBlock(const Slice& block_contents, |
|
|
|
|
@ -364,11 +504,8 @@ Status BlockBasedTableBuilder::Finish() { |
|
|
|
|
// 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->internal_comparator.FindShortSuccessor(&r->last_key); |
|
|
|
|
|
|
|
|
|
std::string handle_encoding; |
|
|
|
|
r->pending_handle.EncodeTo(&handle_encoding); |
|
|
|
|
r->index_block.Add(r->last_key, handle_encoding); |
|
|
|
|
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.
|
|
|
|
|
@ -394,11 +531,12 @@ Status BlockBasedTableBuilder::Finish() { |
|
|
|
|
r->props.filter_policy_name = r->options.filter_policy != nullptr ? |
|
|
|
|
r->options.filter_policy->Name() : ""; |
|
|
|
|
r->props.index_size = |
|
|
|
|
r->index_block.CurrentSizeEstimate() + kBlockTrailerSize; |
|
|
|
|
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(), |
|
|
|
|
@ -425,7 +563,7 @@ Status BlockBasedTableBuilder::Finish() { |
|
|
|
|
|
|
|
|
|
// Write index block
|
|
|
|
|
if (ok()) { |
|
|
|
|
WriteBlock(&r->index_block, &index_block_handle); |
|
|
|
|
WriteBlock(r->index_builder->Finish(), &index_block_handle); |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Write footer
|
|
|
|
|
|
Igor Canadi
10 years ago