fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
148 lines
5.9 KiB
148 lines
5.9 KiB
1 year ago
|
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
||
|
// This source code is licensed under both the GPLv2 (found in the
|
||
|
// COPYING file in the root directory) and Apache 2.0 License
|
||
|
// (found in the LICENSE.Apache file in the root directory).
|
||
|
|
||
|
#pragma once
|
||
|
|
||
|
#include <stddef.h>
|
||
|
#include <stdint.h>
|
||
|
|
||
|
#include <memory>
|
||
|
#include <string>
|
||
|
#include <vector>
|
||
|
|
||
|
#include "rocksdb/options.h"
|
||
|
#include "rocksdb/slice.h"
|
||
|
#include "rocksdb/slice_transform.h"
|
||
|
#include "table/block_based/filter_block_reader_common.h"
|
||
|
#include "table/block_based/filter_policy_internal.h"
|
||
|
#include "table/block_based/parsed_full_filter_block.h"
|
||
|
#include "util/hash.h"
|
||
|
|
||
|
namespace ROCKSDB_NAMESPACE {
|
||
|
|
||
|
class FilterPolicy;
|
||
|
class FilterBitsBuilder;
|
||
|
class FilterBitsReader;
|
||
|
|
||
|
// A FullFilterBlockBuilder is used to construct a full filter for a
|
||
|
// particular Table. It generates a single string which is stored as
|
||
|
// a special block in the Table.
|
||
|
// The format of full filter block is:
|
||
|
// +----------------------------------------------------------------+
|
||
|
// | full filter for all keys in sst file |
|
||
|
// +----------------------------------------------------------------+
|
||
|
// The full filter can be very large. At the end of it, we put
|
||
|
// num_probes: how many hash functions are used in bloom filter
|
||
|
//
|
||
|
class FullFilterBlockBuilder : public FilterBlockBuilder {
|
||
|
public:
|
||
|
explicit FullFilterBlockBuilder(const SliceTransform* prefix_extractor,
|
||
|
bool whole_key_filtering,
|
||
|
FilterBitsBuilder* filter_bits_builder);
|
||
|
// No copying allowed
|
||
|
FullFilterBlockBuilder(const FullFilterBlockBuilder&) = delete;
|
||
|
void operator=(const FullFilterBlockBuilder&) = delete;
|
||
|
|
||
|
// bits_builder is created in filter_policy, it should be passed in here
|
||
|
// directly. and be deleted here
|
||
|
~FullFilterBlockBuilder() {}
|
||
|
|
||
|
virtual void Add(const Slice& key_without_ts) override;
|
||
|
virtual bool IsEmpty() const override { return !any_added_; }
|
||
|
virtual size_t EstimateEntriesAdded() override;
|
||
|
virtual Slice Finish(
|
||
|
const BlockHandle& tmp, Status* status,
|
||
|
std::unique_ptr<const char[]>* filter_data = nullptr) override;
|
||
|
using FilterBlockBuilder::Finish;
|
||
|
|
||
|
virtual void ResetFilterBitsBuilder() override {
|
||
|
filter_bits_builder_.reset();
|
||
|
}
|
||
|
|
||
|
virtual Status MaybePostVerifyFilter(const Slice& filter_content) override {
|
||
|
return filter_bits_builder_->MaybePostVerify(filter_content);
|
||
|
}
|
||
|
|
||
|
protected:
|
||
|
virtual void AddKey(const Slice& key);
|
||
|
std::unique_ptr<FilterBitsBuilder> filter_bits_builder_;
|
||
|
virtual void Reset();
|
||
|
void AddPrefix(const Slice& key);
|
||
|
const SliceTransform* prefix_extractor() { return prefix_extractor_; }
|
||
|
const std::string& last_prefix_str() const { return last_prefix_str_; }
|
||
|
|
||
|
private:
|
||
|
// important: all of these might point to invalid addresses
|
||
|
// at the time of destruction of this filter block. destructor
|
||
|
// should NOT dereference them.
|
||
|
const SliceTransform* prefix_extractor_;
|
||
|
bool whole_key_filtering_;
|
||
|
bool last_whole_key_recorded_;
|
||
|
std::string last_whole_key_str_;
|
||
|
bool last_prefix_recorded_;
|
||
|
std::string last_prefix_str_;
|
||
|
// Whether prefix_extractor_->InDomain(last_whole_key_) is true.
|
||
|
// Used in partitioned filters so that the last prefix from the previous
|
||
|
// filter partition will be added to the current partition if
|
||
|
// last_key_in_domain_ is true, regardless of the current key.
|
||
|
bool last_key_in_domain_;
|
||
|
bool any_added_;
|
||
|
std::unique_ptr<const char[]> filter_data_;
|
||
|
};
|
||
|
|
||
|
// A FilterBlockReader is used to parse filter from SST table.
|
||
|
// KeyMayMatch and PrefixMayMatch would trigger filter checking
|
||
|
class FullFilterBlockReader
|
||
|
: public FilterBlockReaderCommon<ParsedFullFilterBlock> {
|
||
|
public:
|
||
|
FullFilterBlockReader(const BlockBasedTable* t,
|
||
|
CachableEntry<ParsedFullFilterBlock>&& filter_block);
|
||
|
|
||
|
static std::unique_ptr<FilterBlockReader> Create(
|
||
|
const BlockBasedTable* table, const ReadOptions& ro,
|
||
|
FilePrefetchBuffer* prefetch_buffer, bool use_cache, bool prefetch,
|
||
|
bool pin, BlockCacheLookupContext* lookup_context);
|
||
|
|
||
|
bool KeyMayMatch(const Slice& key, const bool no_io,
|
||
|
const Slice* const const_ikey_ptr, GetContext* get_context,
|
||
|
BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) override;
|
||
|
|
||
|
bool PrefixMayMatch(const Slice& prefix, const bool no_io,
|
||
|
const Slice* const const_ikey_ptr,
|
||
|
GetContext* get_context,
|
||
|
BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) override;
|
||
|
|
||
|
void KeysMayMatch(MultiGetRange* range, const bool no_io,
|
||
|
BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) override;
|
||
|
// Used in partitioned filter code
|
||
|
void KeysMayMatch2(MultiGetRange* range,
|
||
|
const SliceTransform* /*prefix_extractor*/,
|
||
|
const bool no_io, BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) {
|
||
|
KeysMayMatch(range, no_io, lookup_context, read_options);
|
||
|
}
|
||
|
|
||
|
void PrefixesMayMatch(MultiGetRange* range,
|
||
|
const SliceTransform* prefix_extractor,
|
||
|
const bool no_io,
|
||
|
BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) override;
|
||
|
size_t ApproximateMemoryUsage() const override;
|
||
|
|
||
|
private:
|
||
|
bool MayMatch(const Slice& entry, bool no_io, GetContext* get_context,
|
||
|
BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) const;
|
||
|
void MayMatch(MultiGetRange* range, bool no_io,
|
||
|
const SliceTransform* prefix_extractor,
|
||
|
BlockCacheLookupContext* lookup_context,
|
||
|
const ReadOptions& read_options) const;
|
||
|
};
|
||
|
|
||
|
} // namespace ROCKSDB_NAMESPACE
|