d51dc96a79
Summary: Experiments on column-aware encodings. Supported features: 1) extract data blocks from SST file and encode with specified encodings; 2) Decode encoded data back into row format; 3) Directly extract data blocks and write in row format (without prefix encoding); 4) Get column distribution statistics for column format; 5) Dump data blocks separated by columns in human-readable format. There is still on-going work on this diff. More refactoring is necessary. Test Plan: Wrote tests in `column_aware_encoding_test.cc`. More tests should be added. Reviewers: sdong Reviewed By: sdong Subscribers: arahut, andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D60027
1985 lines
71 KiB
C++
1985 lines
71 KiB
C++
// Copyright (c) 2011-present, 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_reader.h"
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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_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/persistent_cache_helper.h"
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#include "table/two_level_iterator.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/perf_context_imp.h"
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#include "util/stop_watch.h"
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#include "util/string_util.h"
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namespace rocksdb {
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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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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(RandomAccessFileReader* file, const Footer& footer,
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const ReadOptions& options, const BlockHandle& handle,
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std::unique_ptr<Block>* result,
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const ImmutableCFOptions &ioptions,
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bool do_uncompress, const Slice& compression_dict,
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const PersistentCacheOptions& cache_options) {
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BlockContents contents;
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Status s = ReadBlockContents(file, footer, options, handle, &contents, ioptions,
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do_uncompress, compression_dict, cache_options);
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if (s.ok()) {
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result->reset(new Block(std::move(contents)));
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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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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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Statistics* statistics) {
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auto cache_handle = block_cache->Lookup(key);
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if (cache_handle != nullptr) {
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PERF_COUNTER_ADD(block_cache_hit_count, 1);
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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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// block-type specific cache hit
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RecordTick(statistics, block_cache_hit_ticker);
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} else {
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// overall cache miss
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RecordTick(statistics, BLOCK_CACHE_MISS);
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// block-type specific cache miss
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RecordTick(statistics, block_cache_miss_ticker);
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}
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return cache_handle;
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}
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} // namespace
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// -- IndexReader and its subclasses
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// IndexReader is the interface that provide the functionality for index access.
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class BlockBasedTable::IndexReader {
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public:
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explicit IndexReader(const Comparator* comparator, Statistics* stats)
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: comparator_(comparator), statistics_(stats) {}
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virtual ~IndexReader() {}
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// Create an iterator for index access.
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// An iter is passed in, if it is not null, update this one and return it
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// If it is null, create a new Iterator
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virtual InternalIterator* NewIterator(BlockIter* iter = nullptr,
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bool total_order_seek = true) = 0;
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// The size of the index.
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virtual size_t size() const = 0;
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// Memory usage of the index block
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virtual size_t usable_size() const = 0;
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// return the statistics pointer
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virtual Statistics* statistics() const { return statistics_; }
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// Report an approximation of how much memory has been used other than memory
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// that was allocated in block cache.
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virtual size_t ApproximateMemoryUsage() const = 0;
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protected:
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const Comparator* comparator_;
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private:
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Statistics* statistics_;
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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, const Footer& footer,
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const BlockHandle& index_handle,
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const ImmutableCFOptions &ioptions,
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const Comparator* comparator, IndexReader** index_reader,
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const PersistentCacheOptions& cache_options) {
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std::unique_ptr<Block> index_block;
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auto s = ReadBlockFromFile(file, 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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if (s.ok()) {
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*index_reader = new BinarySearchIndexReader(
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comparator, std::move(index_block), ioptions.statistics);
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}
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return s;
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}
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virtual InternalIterator* NewIterator(BlockIter* iter = nullptr,
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bool dont_care = true) override {
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return index_block_->NewIterator(comparator_, iter, true);
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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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return index_block_->ApproximateMemoryUsage();
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}
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private:
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BinarySearchIndexReader(const Comparator* comparator,
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std::unique_ptr<Block>&& index_block,
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Statistics* stats)
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: IndexReader(comparator, stats), index_block_(std::move(index_block)) {
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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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};
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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, const ImmutableCFOptions &ioptions,
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const Comparator* comparator, 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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std::unique_ptr<Block> index_block;
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auto s = ReadBlockFromFile(file, 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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if (!s.ok()) {
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return s;
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}
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// Note, failure to create prefix hash index does not need to be a
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// hard error. We can still fall back to the original binary search index.
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// So, Create will succeed regardless, from this point on.
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auto new_index_reader =
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new HashIndexReader(comparator, std::move(index_block),
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ioptions.statistics);
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*index_reader = new_index_reader;
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// Get prefixes block
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BlockHandle prefixes_handle;
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s = FindMetaBlock(meta_index_iter, kHashIndexPrefixesBlock,
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&prefixes_handle);
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if (!s.ok()) {
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// TODO: log error
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return Status::OK();
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}
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// Get index metadata block
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BlockHandle prefixes_meta_handle;
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s = FindMetaBlock(meta_index_iter, kHashIndexPrefixesMetadataBlock,
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&prefixes_meta_handle);
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if (!s.ok()) {
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// TODO: log error
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return Status::OK();
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}
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// Read contents for the blocks
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BlockContents prefixes_contents;
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s = ReadBlockContents(file, footer, ReadOptions(), prefixes_handle,
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&prefixes_contents, ioptions, true /* decompress */,
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Slice() /*compression dict*/, cache_options);
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if (!s.ok()) {
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return s;
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}
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BlockContents prefixes_meta_contents;
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s = ReadBlockContents(file, footer, ReadOptions(), prefixes_meta_handle,
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&prefixes_meta_contents, ioptions, true /* decompress */,
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Slice() /*compression dict*/, cache_options);
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if (!s.ok()) {
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// TODO: log error
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return Status::OK();
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}
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BlockPrefixIndex* prefix_index = nullptr;
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s = BlockPrefixIndex::Create(hash_key_extractor, prefixes_contents.data,
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prefixes_meta_contents.data, &prefix_index);
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// TODO: log error
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if (s.ok()) {
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new_index_reader->index_block_->SetBlockPrefixIndex(prefix_index);
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}
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return Status::OK();
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}
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virtual InternalIterator* NewIterator(BlockIter* iter = nullptr,
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bool total_order_seek = true) override {
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return index_block_->NewIterator(comparator_, iter, total_order_seek);
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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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return index_block_->ApproximateMemoryUsage() +
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prefixes_contents_.data.size();
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}
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private:
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HashIndexReader(const Comparator* comparator,
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std::unique_ptr<Block>&& index_block, Statistics* stats)
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: IndexReader(comparator, stats), index_block_(std::move(index_block)) {
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assert(index_block_ != nullptr);
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}
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~HashIndexReader() {
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}
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std::unique_ptr<Block> index_block_;
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BlockContents prefixes_contents_;
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};
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// CachableEntry represents the entries that *may* be fetched from block cache.
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// field `value` is the item we want to get.
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// field `cache_handle` is the cache handle to the block cache. If the value
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// was not read from cache, `cache_handle` will be nullptr.
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template <class TValue>
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struct BlockBasedTable::CachableEntry {
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CachableEntry(TValue* _value, Cache::Handle* _cache_handle)
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: value(_value), cache_handle(_cache_handle) {}
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CachableEntry() : CachableEntry(nullptr, nullptr) {}
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void Release(Cache* cache) {
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if (cache_handle) {
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cache->Release(cache_handle);
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value = nullptr;
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cache_handle = nullptr;
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}
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}
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bool IsSet() const { return cache_handle != nullptr; }
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TValue* value = nullptr;
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// if the entry is from the cache, cache_handle will be populated.
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Cache::Handle* cache_handle = nullptr;
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};
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struct BlockBasedTable::Rep {
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Rep(const ImmutableCFOptions& _ioptions, const EnvOptions& _env_options,
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const BlockBasedTableOptions& _table_opt,
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const InternalKeyComparator& _internal_comparator, bool skip_filters)
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: ioptions(_ioptions),
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env_options(_env_options),
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table_options(_table_opt),
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filter_policy(skip_filters ? nullptr : _table_opt.filter_policy.get()),
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internal_comparator(_internal_comparator),
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filter_type(FilterType::kNoFilter),
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whole_key_filtering(_table_opt.whole_key_filtering),
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prefix_filtering(true) {}
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const ImmutableCFOptions& ioptions;
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const EnvOptions& env_options;
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const BlockBasedTableOptions& table_options;
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const FilterPolicy* const filter_policy;
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const InternalKeyComparator& internal_comparator;
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Status status;
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unique_ptr<RandomAccessFileReader> file;
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char cache_key_prefix[kMaxCacheKeyPrefixSize];
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size_t cache_key_prefix_size = 0;
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char persistent_cache_key_prefix[kMaxCacheKeyPrefixSize];
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size_t persistent_cache_key_prefix_size = 0;
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char compressed_cache_key_prefix[kMaxCacheKeyPrefixSize];
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size_t compressed_cache_key_prefix_size = 0;
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uint64_t dummy_index_reader_offset =
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0; // ID that is unique for the block cache.
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PersistentCacheOptions persistent_cache_options;
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// Footer contains the fixed table information
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Footer footer;
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// index_reader and filter will be populated and used only when
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// options.block_cache is nullptr; otherwise we will get the index block via
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// the block cache.
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unique_ptr<IndexReader> index_reader;
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unique_ptr<FilterBlockReader> filter;
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enum class FilterType {
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kNoFilter,
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kFullFilter,
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kBlockFilter,
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};
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FilterType filter_type;
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BlockHandle filter_handle;
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std::shared_ptr<const TableProperties> table_properties;
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// Block containing the data for the compression dictionary. We take ownership
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// for the entire block struct, even though we only use its Slice member. This
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// is easier because the Slice member depends on the continued existence of
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// another member ("allocation").
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std::unique_ptr<const BlockContents> compression_dict_block;
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BlockBasedTableOptions::IndexType index_type;
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bool hash_index_allow_collision;
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bool whole_key_filtering;
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bool prefix_filtering;
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// TODO(kailiu) It is very ugly to use internal key in table, since table
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// module should not be relying on db module. However to make things easier
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// and compatible with existing code, we introduce a wrapper that allows
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// block to extract prefix without knowing if a key is internal or not.
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unique_ptr<SliceTransform> internal_prefix_transform;
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// only used in level 0 files:
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// when pin_l0_filter_and_index_blocks_in_cache is true, we do use the
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// LRU cache, but we always keep the filter & idndex block's handle checked
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// out here (=we don't call Release()), plus the parsed out objects
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// the LRU cache will never push flush them out, hence they're pinned
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CachableEntry<FilterBlockReader> filter_entry;
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CachableEntry<IndexReader> index_entry;
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};
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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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// Helper function to setup the cache key's prefix for the Table.
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void BlockBasedTable::SetupCacheKeyPrefix(Rep* rep, uint64_t file_size) {
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assert(kMaxCacheKeyPrefixSize >= 10);
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rep->cache_key_prefix_size = 0;
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rep->compressed_cache_key_prefix_size = 0;
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if (rep->table_options.block_cache != nullptr) {
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GenerateCachePrefix(rep->table_options.block_cache.get(), rep->file->file(),
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&rep->cache_key_prefix[0], &rep->cache_key_prefix_size);
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// Create dummy offset of index reader which is beyond the file size.
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rep->dummy_index_reader_offset =
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file_size + rep->table_options.block_cache->NewId();
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}
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if (rep->table_options.persistent_cache != nullptr) {
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GenerateCachePrefix(/*cache=*/nullptr, rep->file->file(),
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&rep->persistent_cache_key_prefix[0],
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&rep->persistent_cache_key_prefix_size);
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}
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if (rep->table_options.block_cache_compressed != nullptr) {
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GenerateCachePrefix(rep->table_options.block_cache_compressed.get(),
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rep->file->file(), &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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void BlockBasedTable::GenerateCachePrefix(Cache* cc,
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RandomAccessFile* file, char* buffer, size_t* size) {
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// generate an id from the file
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*size = file->GetUniqueId(buffer, kMaxCacheKeyPrefixSize);
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// If the prefix wasn't generated or was too long,
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// create one from the cache.
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if (cc && *size == 0) {
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char* end = EncodeVarint64(buffer, cc->NewId());
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*size = static_cast<size_t>(end - buffer);
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}
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}
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void BlockBasedTable::GenerateCachePrefix(Cache* cc,
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WritableFile* file, char* buffer, size_t* size) {
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// generate an id from the file
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*size = file->GetUniqueId(buffer, kMaxCacheKeyPrefixSize);
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// If the prefix wasn't generated or was too long,
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// create one from the cache.
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if (*size == 0) {
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char* end = EncodeVarint64(buffer, cc->NewId());
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*size = static_cast<size_t>(end - buffer);
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}
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}
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|
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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) {
|
|
Log(InfoLogLevel::WARN_LEVEL, info_log,
|
|
"Property %s has invalidate value %s", user_prop_name.c_str(),
|
|
pos->second.c_str());
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
} // 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 bool prefetch_index_and_filter_in_cache,
|
|
const bool skip_filters, const int level) {
|
|
table_reader->reset();
|
|
|
|
Footer footer;
|
|
auto s = ReadFooterFromFile(file.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 and the index block: we're
|
|
// ready to serve requests.
|
|
Rep* rep = new BlockBasedTable::Rep(ioptions, env_options, table_options,
|
|
internal_comparator, skip_filters);
|
|
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;
|
|
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, &meta, &meta_iter);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// Find filter handle and filter type
|
|
if (rep->filter_policy) {
|
|
for (auto prefix : {kFullFilterBlockPrefix, kFilterBlockPrefix}) {
|
|
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 = (prefix == kFullFilterBlockPrefix)
|
|
? Rep::FilterType::kFullFilter
|
|
: Rep::FilterType::kBlockFilter;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read the properties
|
|
bool found_properties_block = true;
|
|
s = SeekToPropertiesBlock(meta_iter.get(), &found_properties_block);
|
|
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::WARN_LEVEL, rep->ioptions.info_log,
|
|
"Cannot seek 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(), rep->footer,
|
|
rep->ioptions, &table_properties);
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::WARN_LEVEL, rep->ioptions.info_log,
|
|
"Encountered error while reading data from properties "
|
|
"block %s", s.ToString().c_str());
|
|
} else {
|
|
rep->table_properties.reset(table_properties);
|
|
}
|
|
} else {
|
|
Log(InfoLogLevel::ERROR_LEVEL, rep->ioptions.info_log,
|
|
"Cannot find Properties block from file.");
|
|
}
|
|
|
|
// Read the compression dictionary meta block
|
|
bool found_compression_dict;
|
|
s = SeekToCompressionDictBlock(meta_iter.get(), &found_compression_dict);
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::WARN_LEVEL, rep->ioptions.info_log,
|
|
"Cannot seek to compression dictionary block from file: %s",
|
|
s.ToString().c_str());
|
|
} else if (found_compression_dict) {
|
|
// TODO(andrewkr): Add to block cache if cache_index_and_filter_blocks is
|
|
// true.
|
|
unique_ptr<BlockContents> compression_dict_block{new BlockContents()};
|
|
s = rocksdb::ReadMetaBlock(rep->file.get(), file_size,
|
|
kBlockBasedTableMagicNumber, rep->ioptions,
|
|
rocksdb::kCompressionDictBlock,
|
|
compression_dict_block.get());
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::WARN_LEVEL, 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_block);
|
|
}
|
|
}
|
|
|
|
// Determine whether whole key filtering is supported.
|
|
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);
|
|
}
|
|
|
|
// 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) {
|
|
if (prefetch_index_and_filter_in_cache || level == 0) {
|
|
assert(table_options.block_cache != nullptr);
|
|
// Hack: Call NewIndexIterator() to implicitly add index to the
|
|
// block_cache
|
|
|
|
// if pin_l0_filter_and_index_blocks_in_cache is true and this is
|
|
// a level0 file, then we will pass in this pointer to rep->index
|
|
// to NewIndexIterator(), which will save the index block in there
|
|
// else it's a nullptr and nothing special happens
|
|
CachableEntry<IndexReader>* index_entry = nullptr;
|
|
if (rep->table_options.pin_l0_filter_and_index_blocks_in_cache &&
|
|
level == 0) {
|
|
index_entry = &rep->index_entry;
|
|
}
|
|
unique_ptr<InternalIterator> iter(
|
|
new_table->NewIndexIterator(ReadOptions(), nullptr, index_entry));
|
|
s = iter->status();
|
|
|
|
if (s.ok()) {
|
|
// Hack: Call GetFilter() to implicitly add filter to the block_cache
|
|
auto filter_entry = new_table->GetFilter();
|
|
// if pin_l0_filter_and_index_blocks_in_cache is true, and this is
|
|
// a level0 file, 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 (rep->table_options.pin_l0_filter_and_index_blocks_in_cache &&
|
|
level == 0) {
|
|
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(&index_reader, meta_iter.get());
|
|
|
|
if (s.ok()) {
|
|
rep->index_reader.reset(index_reader);
|
|
|
|
// Set filter block
|
|
if (rep->filter_policy) {
|
|
rep->filter.reset(ReadFilter(rep));
|
|
}
|
|
} else {
|
|
delete index_reader;
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
*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);
|
|
}
|
|
compaction_optimized_ = true;
|
|
}
|
|
|
|
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,
|
|
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.
|
|
// TODO: we never really verify check sum for meta index block
|
|
std::unique_ptr<Block> meta;
|
|
Status s = ReadBlockFromFile(
|
|
rep->file.get(), rep->footer, ReadOptions(),
|
|
rep->footer.metaindex_handle(), &meta, rep->ioptions,
|
|
true /* decompress */, Slice() /*compression dict*/,
|
|
rep->persistent_cache_options);
|
|
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::ERROR_LEVEL, 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(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) {
|
|
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, BLOCK_CACHE_DATA_MISS,
|
|
BLOCK_CACHE_DATA_HIT, statistics);
|
|
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;
|
|
s = UncompressBlockContents(compressed_block->data(),
|
|
compressed_block->size(), &contents,
|
|
format_version, compression_dict,
|
|
ioptions);
|
|
|
|
// Insert uncompressed block into block cache
|
|
if (s.ok()) {
|
|
block->value = new Block(std::move(contents)); // uncompressed block
|
|
assert(block->value->compression_type() == kNoCompression);
|
|
if (block_cache != nullptr && block->value->cachable() &&
|
|
read_options.fill_cache) {
|
|
s = block_cache->Insert(
|
|
block_cache_key, block->value, block->value->usable_size(),
|
|
&DeleteCachedEntry<Block>, &(block->cache_handle));
|
|
if (s.ok()) {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
} 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) {
|
|
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) {
|
|
s = UncompressBlockContents(raw_block->data(), raw_block->size(), &contents,
|
|
format_version, compression_dict, ioptions);
|
|
}
|
|
if (!s.ok()) {
|
|
delete raw_block;
|
|
return s;
|
|
}
|
|
|
|
if (raw_block->compression_type() != kNoCompression) {
|
|
block->value = new Block(std::move(contents)); // 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->usable_size(),
|
|
&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()) {
|
|
s = block_cache->Insert(block_cache_key, block->value,
|
|
block->value->usable_size(),
|
|
&DeleteCachedEntry<Block>, &(block->cache_handle));
|
|
if (s.ok()) {
|
|
assert(block->cache_handle != nullptr);
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE,
|
|
block->value->usable_size());
|
|
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(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;
|
|
if (!ReadBlockContents(rep->file.get(), rep->footer, ReadOptions(),
|
|
rep->filter_handle, &block, rep->ioptions,
|
|
false /* decompress */, Slice() /*compression dict*/,
|
|
rep->persistent_cache_options)
|
|
.ok()) {
|
|
// Error reading the block
|
|
return nullptr;
|
|
}
|
|
|
|
assert(rep->filter_policy);
|
|
|
|
if (rep->filter_type == Rep::FilterType::kBlockFilter) {
|
|
return new BlockBasedFilterBlockReader(
|
|
rep->prefix_filtering ? rep->ioptions.prefix_extractor : nullptr,
|
|
rep->table_options, rep->whole_key_filtering, std::move(block),
|
|
rep->ioptions.statistics);
|
|
} else if (rep->filter_type == Rep::FilterType::kFullFilter) {
|
|
auto filter_bits_reader =
|
|
rep->filter_policy->GetFilterBitsReader(block.data);
|
|
if (filter_bits_reader != nullptr) {
|
|
return new FullFilterBlockReader(
|
|
rep->prefix_filtering ? rep->ioptions.prefix_extractor : nullptr,
|
|
rep->whole_key_filtering, std::move(block), filter_bits_reader,
|
|
rep->ioptions.statistics);
|
|
}
|
|
}
|
|
|
|
// filter_type is either kNoFilter (exited the function at the first if),
|
|
// kBlockFilter or kFullFilter. there is no way for the execution to come here
|
|
assert(false);
|
|
return nullptr;
|
|
}
|
|
|
|
BlockBasedTable::CachableEntry<FilterBlockReader> BlockBasedTable::GetFilter(
|
|
bool no_io) 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 (!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 */};
|
|
}
|
|
|
|
// we have a pinned filter block
|
|
if (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,
|
|
rep_->footer.metaindex_handle(),
|
|
cache_key);
|
|
|
|
Statistics* statistics = rep_->ioptions.statistics;
|
|
auto cache_handle =
|
|
GetEntryFromCache(block_cache, key, BLOCK_CACHE_FILTER_MISS,
|
|
BLOCK_CACHE_FILTER_HIT, statistics);
|
|
|
|
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(rep_);
|
|
if (filter != nullptr) {
|
|
assert(filter->size() > 0);
|
|
Status s = block_cache->Insert(key, filter, filter->size(),
|
|
&DeleteCachedFilterEntry, &cache_handle);
|
|
if (s.ok()) {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, filter->size());
|
|
RecordTick(statistics, BLOCK_CACHE_FILTER_BYTES_INSERT, filter->size());
|
|
} else {
|
|
RecordTick(statistics, BLOCK_CACHE_ADD_FAILURES);
|
|
delete filter;
|
|
return CachableEntry<FilterBlockReader>();
|
|
}
|
|
}
|
|
}
|
|
|
|
return { filter, cache_handle };
|
|
}
|
|
|
|
InternalIterator* BlockBasedTable::NewIndexIterator(
|
|
const ReadOptions& read_options, BlockIter* input_iter,
|
|
CachableEntry<IndexReader>* index_entry) {
|
|
// index reader has already been pre-populated.
|
|
if (rep_->index_reader) {
|
|
return rep_->index_reader->NewIterator(
|
|
input_iter, read_options.total_order_seek);
|
|
}
|
|
// we have a pinned index block
|
|
if (rep_->index_entry.IsSet()) {
|
|
return rep_->index_entry.value->NewIterator(input_iter,
|
|
read_options.total_order_seek);
|
|
}
|
|
|
|
PERF_TIMER_GUARD(read_index_block_nanos);
|
|
|
|
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, statistics);
|
|
|
|
if (cache_handle == nullptr && no_io) {
|
|
if (input_iter != nullptr) {
|
|
input_iter->SetStatus(Status::Incomplete("no blocking io"));
|
|
return input_iter;
|
|
} else {
|
|
return NewErrorInternalIterator(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;
|
|
s = CreateIndexReader(&index_reader);
|
|
if (s.ok()) {
|
|
assert(index_reader != nullptr);
|
|
s = block_cache->Insert(key, index_reader, index_reader->usable_size(),
|
|
&DeleteCachedIndexEntry, &cache_handle);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
size_t usable_size = index_reader->usable_size();
|
|
RecordTick(statistics, BLOCK_CACHE_ADD);
|
|
RecordTick(statistics, BLOCK_CACHE_BYTES_WRITE, usable_size);
|
|
RecordTick(statistics, BLOCK_CACHE_INDEX_BYTES_INSERT, usable_size);
|
|
} 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->SetStatus(s);
|
|
return input_iter;
|
|
} else {
|
|
return NewErrorInternalIterator(s);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
assert(cache_handle);
|
|
auto* iter = index_reader->NewIterator(
|
|
input_iter, read_options.total_order_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
|
|
InternalIterator* BlockBasedTable::NewDataBlockIterator(
|
|
Rep* rep, const ReadOptions& ro, const Slice& index_value,
|
|
BlockIter* input_iter) {
|
|
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();
|
|
Cache* block_cache_compressed =
|
|
rep->table_options.block_cache_compressed.get();
|
|
CachableEntry<Block> block;
|
|
|
|
BlockHandle handle;
|
|
Slice input = index_value;
|
|
// We intentionally allow extra stuff in index_value so that we
|
|
// can add more features in the future.
|
|
Status s = handle.DecodeFrom(&input);
|
|
|
|
if (!s.ok()) {
|
|
if (input_iter != nullptr) {
|
|
input_iter->SetStatus(s);
|
|
return input_iter;
|
|
} else {
|
|
return NewErrorInternalIterator(s);
|
|
}
|
|
}
|
|
|
|
Slice compression_dict;
|
|
if (rep->compression_dict_block) {
|
|
compression_dict = rep->compression_dict_block->data;
|
|
}
|
|
// If either block cache is enabled, we'll try to read from it.
|
|
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,
|
|
rep->table_options.format_version, compression_dict);
|
|
|
|
if (block.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(), rep->footer, ro, handle,
|
|
&raw_block, rep->ioptions,
|
|
block_cache_compressed == nullptr,
|
|
compression_dict, rep->persistent_cache_options);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
s = PutDataBlockToCache(key, ckey, block_cache, block_cache_compressed,
|
|
ro, rep->ioptions, &block, raw_block.release(),
|
|
rep->table_options.format_version,
|
|
compression_dict);
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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
|
|
if (input_iter != nullptr) {
|
|
input_iter->SetStatus(Status::Incomplete("no blocking io"));
|
|
return input_iter;
|
|
} else {
|
|
return NewErrorInternalIterator(Status::Incomplete("no blocking io"));
|
|
}
|
|
}
|
|
std::unique_ptr<Block> block_value;
|
|
s = ReadBlockFromFile(rep->file.get(), rep->footer, ro, handle,
|
|
&block_value, rep->ioptions, true /* compress */,
|
|
compression_dict, rep->persistent_cache_options);
|
|
if (s.ok()) {
|
|
block.value = block_value.release();
|
|
}
|
|
}
|
|
|
|
InternalIterator* iter;
|
|
if (s.ok()) {
|
|
assert(block.value != nullptr);
|
|
iter = block.value->NewIterator(&rep->internal_comparator, input_iter);
|
|
if (block.cache_handle != nullptr) {
|
|
iter->RegisterCleanup(&ReleaseCachedEntry, block_cache,
|
|
block.cache_handle);
|
|
} else {
|
|
iter->RegisterCleanup(&DeleteHeldResource<Block>, block.value, nullptr);
|
|
}
|
|
} else {
|
|
assert(block.value == nullptr);
|
|
if (input_iter != nullptr) {
|
|
input_iter->SetStatus(s);
|
|
iter = input_iter;
|
|
} else {
|
|
iter = NewErrorInternalIterator(s);
|
|
}
|
|
}
|
|
return iter;
|
|
}
|
|
|
|
class BlockBasedTable::BlockEntryIteratorState : public TwoLevelIteratorState {
|
|
public:
|
|
BlockEntryIteratorState(BlockBasedTable* table,
|
|
const ReadOptions& read_options, bool skip_filters)
|
|
: TwoLevelIteratorState(table->rep_->ioptions.prefix_extractor !=
|
|
nullptr),
|
|
table_(table),
|
|
read_options_(read_options),
|
|
skip_filters_(skip_filters) {}
|
|
|
|
InternalIterator* NewSecondaryIterator(const Slice& index_value) override {
|
|
return NewDataBlockIterator(table_->rep_, read_options_, index_value);
|
|
}
|
|
|
|
bool PrefixMayMatch(const Slice& internal_key) override {
|
|
if (read_options_.total_order_seek || skip_filters_) {
|
|
return true;
|
|
}
|
|
return table_->PrefixMayMatch(internal_key);
|
|
}
|
|
|
|
private:
|
|
// Don't own table_
|
|
BlockBasedTable* table_;
|
|
const ReadOptions read_options_;
|
|
bool skip_filters_;
|
|
};
|
|
|
|
// 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) {
|
|
if (!rep_->filter_policy) {
|
|
return true;
|
|
}
|
|
|
|
assert(rep_->ioptions.prefix_extractor != nullptr);
|
|
auto user_key = ExtractUserKey(internal_key);
|
|
if (!rep_->ioptions.prefix_extractor->InDomain(user_key)) {
|
|
return true;
|
|
}
|
|
auto prefix = rep_->ioptions.prefix_extractor->Transform(user_key);
|
|
InternalKey internal_key_prefix(prefix, kMaxSequenceNumber, kTypeValue);
|
|
auto internal_prefix = internal_key_prefix.Encode();
|
|
|
|
bool may_match = true;
|
|
Status s;
|
|
|
|
// 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;
|
|
|
|
// First, try check with full filter
|
|
auto filter_entry = GetFilter(true /* no io */);
|
|
FilterBlockReader* filter = filter_entry.value;
|
|
if (filter != nullptr) {
|
|
if (!filter->IsBlockBased()) {
|
|
may_match = filter->PrefixMayMatch(prefix);
|
|
} else {
|
|
// Then, try find it within each block
|
|
unique_ptr<InternalIterator> iiter(NewIndexIterator(no_io_read_options));
|
|
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 (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.
|
|
Slice handle_value = iiter->value();
|
|
BlockHandle handle;
|
|
s = handle.DecodeFrom(&handle_value);
|
|
assert(s.ok());
|
|
may_match = filter->PrefixMayMatch(prefix, handle.offset());
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
InternalIterator* BlockBasedTable::NewIterator(const ReadOptions& read_options,
|
|
Arena* arena,
|
|
bool skip_filters) {
|
|
return NewTwoLevelIterator(
|
|
new BlockEntryIteratorState(this, read_options, skip_filters),
|
|
NewIndexIterator(read_options), arena);
|
|
}
|
|
|
|
bool BlockBasedTable::FullFilterKeyMayMatch(const ReadOptions& read_options,
|
|
FilterBlockReader* filter,
|
|
const Slice& internal_key) const {
|
|
if (filter == nullptr || filter->IsBlockBased()) {
|
|
return true;
|
|
}
|
|
Slice user_key = ExtractUserKey(internal_key);
|
|
if (filter->whole_key_filtering()) {
|
|
return filter->KeyMayMatch(user_key);
|
|
}
|
|
if (!read_options.total_order_seek && rep_->ioptions.prefix_extractor &&
|
|
rep_->ioptions.prefix_extractor->InDomain(user_key) &&
|
|
!filter->PrefixMayMatch(
|
|
rep_->ioptions.prefix_extractor->Transform(user_key))) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
Status BlockBasedTable::Get(const ReadOptions& read_options, const Slice& key,
|
|
GetContext* get_context, bool skip_filters) {
|
|
Status s;
|
|
CachableEntry<FilterBlockReader> filter_entry;
|
|
if (!skip_filters) {
|
|
filter_entry = GetFilter(read_options.read_tier == kBlockCacheTier);
|
|
}
|
|
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)) {
|
|
RecordTick(rep_->ioptions.statistics, BLOOM_FILTER_USEFUL);
|
|
} else {
|
|
BlockIter iiter;
|
|
NewIndexIterator(read_options, &iiter);
|
|
|
|
PinnedIteratorsManager* pinned_iters_mgr = get_context->pinned_iters_mgr();
|
|
bool pin_blocks = pinned_iters_mgr && pinned_iters_mgr->PinningEnabled();
|
|
BlockIter* biter = nullptr;
|
|
|
|
bool done = false;
|
|
for (iiter.Seek(key); iiter.Valid() && !done; iiter.Next()) {
|
|
Slice handle_value = iiter.value();
|
|
|
|
BlockHandle handle;
|
|
bool not_exist_in_filter =
|
|
filter != nullptr && filter->IsBlockBased() == true &&
|
|
handle.DecodeFrom(&handle_value).ok() &&
|
|
!filter->KeyMayMatch(ExtractUserKey(key), handle.offset());
|
|
|
|
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 {
|
|
BlockIter stack_biter;
|
|
if (pin_blocks) {
|
|
// We need to create the BlockIter on heap because we may need to
|
|
// pin it if we encounterd merge operands
|
|
biter = static_cast<BlockIter*>(
|
|
NewDataBlockIterator(rep_, read_options, iiter.value()));
|
|
} else {
|
|
biter = &stack_biter;
|
|
NewDataBlockIterator(rep_, read_options, iiter.value(), biter);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
// Call the *saver function on each entry/block until it returns false
|
|
for (biter->Seek(key); 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(), pin_blocks)) {
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
s = biter->status();
|
|
|
|
if (pin_blocks) {
|
|
if (get_context->State() == GetContext::kMerge) {
|
|
// Pin blocks as long as we are merging
|
|
pinned_iters_mgr->PinIteratorIfNeeded(biter);
|
|
} else {
|
|
delete biter;
|
|
}
|
|
biter = nullptr;
|
|
} else {
|
|
// biter is on stack, Nothing to clean
|
|
}
|
|
}
|
|
}
|
|
if (pin_blocks && biter != nullptr) {
|
|
delete biter;
|
|
}
|
|
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;
|
|
// pre-condition
|
|
if (begin && end && comparator.Compare(*begin, *end) > 0) {
|
|
return Status::InvalidArgument(*begin, *end);
|
|
}
|
|
|
|
BlockIter iiter;
|
|
NewIndexIterator(ReadOptions(), &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()) {
|
|
Slice block_handle = iiter.value();
|
|
|
|
if (end && comparator.Compare(iiter.key(), *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
|
|
BlockIter biter;
|
|
NewDataBlockIterator(rep_, ReadOptions(), block_handle, &biter);
|
|
|
|
if (!biter.status().ok()) {
|
|
// there was an unexpected error while pre-fetching
|
|
return biter.status();
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
bool BlockBasedTable::TEST_KeyInCache(const ReadOptions& options,
|
|
const Slice& key) {
|
|
std::unique_ptr<InternalIterator> iiter(NewIndexIterator(options));
|
|
iiter->Seek(key);
|
|
assert(iiter->Valid());
|
|
CachableEntry<Block> block;
|
|
|
|
BlockHandle handle;
|
|
Slice input = iiter->value();
|
|
Status s = handle.DecodeFrom(&input);
|
|
assert(s.ok());
|
|
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;
|
|
|
|
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());
|
|
assert(s.ok());
|
|
bool in_cache = block.value != nullptr;
|
|
if (in_cache) {
|
|
ReleaseCachedEntry(block_cache, block.cache_handle);
|
|
}
|
|
return in_cache;
|
|
}
|
|
|
|
// 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(
|
|
IndexReader** index_reader, InternalIterator* preloaded_meta_index_iter) {
|
|
// 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.
|
|
auto 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()));
|
|
}
|
|
}
|
|
|
|
auto file = rep_->file.get();
|
|
auto comparator = &rep_->internal_comparator;
|
|
const Footer& footer = rep_->footer;
|
|
if (index_type_on_file == BlockBasedTableOptions::kHashSearch &&
|
|
rep_->ioptions.prefix_extractor == nullptr) {
|
|
Log(InfoLogLevel::WARN_LEVEL, rep_->ioptions.info_log,
|
|
"BlockBasedTableOptions::kHashSearch requires "
|
|
"options.prefix_extractor to be set."
|
|
" Fall back to binary search index.");
|
|
index_type_on_file = BlockBasedTableOptions::kBinarySearch;
|
|
}
|
|
|
|
switch (index_type_on_file) {
|
|
case BlockBasedTableOptions::kBinarySearch: {
|
|
return BinarySearchIndexReader::Create(
|
|
file, footer, footer.index_handle(), rep_->ioptions, comparator,
|
|
index_reader, rep_->persistent_cache_options);
|
|
}
|
|
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_, &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.
|
|
Log(InfoLogLevel::WARN_LEVEL, rep_->ioptions.info_log,
|
|
"Unable to read the metaindex block."
|
|
" Fall back to binary search index.");
|
|
return BinarySearchIndexReader::Create(
|
|
file, footer, footer.index_handle(), rep_->ioptions, comparator,
|
|
index_reader, rep_->persistent_cache_options);
|
|
}
|
|
meta_index_iter = meta_iter_guard.get();
|
|
}
|
|
|
|
// We need to wrap data with internal_prefix_transform to make sure it can
|
|
// handle prefix correctly.
|
|
rep_->internal_prefix_transform.reset(
|
|
new InternalKeySliceTransform(rep_->ioptions.prefix_extractor));
|
|
return HashIndexReader::Create(
|
|
rep_->internal_prefix_transform.get(), footer, file, rep_->ioptions,
|
|
comparator, footer.index_handle(), meta_index_iter, index_reader,
|
|
rep_->hash_index_allow_collision, rep_->persistent_cache_options);
|
|
}
|
|
default: {
|
|
std::string error_message =
|
|
"Unrecognized index type: " + ToString(rep_->index_type);
|
|
return Status::InvalidArgument(error_message.c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
uint64_t BlockBasedTable::ApproximateOffsetOf(const Slice& key) {
|
|
unique_ptr<InternalIterator> index_iter(NewIndexIterator(ReadOptions()));
|
|
|
|
index_iter->Seek(key);
|
|
uint64_t result;
|
|
if (index_iter->Valid()) {
|
|
BlockHandle handle;
|
|
Slice input = index_iter->value();
|
|
Status s = handle.DecodeFrom(&input);
|
|
if (s.ok()) {
|
|
result = handle.offset();
|
|
} else {
|
|
// Strange: we can't decode the block handle in the index block.
|
|
// We'll just return the offset of the metaindex block, which is
|
|
// close to the whole file size for this case.
|
|
result = rep_->footer.metaindex_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<InternalIterator> 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(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) {
|
|
// 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_, &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");
|
|
}
|
|
}
|
|
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;
|
|
if (ReadBlockContents(
|
|
rep_->file.get(), rep_->footer, ReadOptions(), handle, &block,
|
|
rep_->ioptions, false /*decompress*/,
|
|
Slice() /*compression dict*/, rep_->persistent_cache_options)
|
|
.ok()) {
|
|
rep_->filter.reset(new BlockBasedFilterBlockReader(
|
|
rep_->ioptions.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 Data blocks
|
|
s = DumpDataBlocks(out_file);
|
|
|
|
return s;
|
|
}
|
|
|
|
void BlockBasedTable::Close() {
|
|
rep_->filter_entry.Release(rep_->table_options.block_cache.get());
|
|
rep_->index_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_->footer.metaindex_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);
|
|
}
|
|
}
|
|
|
|
Status BlockBasedTable::DumpIndexBlock(WritableFile* out_file) {
|
|
out_file->Append(
|
|
"Index Details:\n"
|
|
"--------------------------------------\n");
|
|
|
|
std::unique_ptr<InternalIterator> 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();
|
|
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(blockhandles_iter->value().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
|
|
std::string str_key = ikey.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<InternalIterator> blockhandles_iter(
|
|
NewIndexIterator(ReadOptions()));
|
|
Status s = blockhandles_iter->status();
|
|
if (!s.ok()) {
|
|
out_file->Append("Can not read Index Block \n\n");
|
|
return s;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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(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;
|
|
}
|
|
Slice key = datablock_iter->key();
|
|
Slice value = datablock_iter->value();
|
|
InternalKey ikey, iValue;
|
|
ikey.DecodeFrom(key);
|
|
iValue.DecodeFrom(value);
|
|
|
|
out_file->Append(" HEX ");
|
|
out_file->Append(ikey.user_key().ToString(true).c_str());
|
|
out_file->Append(": ");
|
|
out_file->Append(iValue.user_key().ToString(true).c_str());
|
|
out_file->Append("\n");
|
|
|
|
std::string str_key = ikey.user_key().ToString();
|
|
std::string str_value = iValue.user_key().ToString();
|
|
std::string res_key(""), res_value("");
|
|
char cspace = ' ';
|
|
for (size_t i = 0; i < str_key.size(); i++) {
|
|
res_key.append(&str_key[i], 1);
|
|
res_key.append(1, cspace);
|
|
}
|
|
for (size_t i = 0; i < str_value.size(); i++) {
|
|
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");
|
|
}
|
|
out_file->Append("\n");
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
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->size());
|
|
}
|
|
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->usable_size());
|
|
}
|
|
delete index_reader;
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
} // namespace rocksdb
|