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953a885ebf
Summary: Currently users have no idea a key is add, delete or merge from TablePropertiesCollector call back. Add a new function to add it. Also refactor the codes so that (1) make table property collector and internal table property collector two separate data structures with the later one now exposed (2) table builders only receive internal table properties Test Plan: Add cases in table_properties_collector_test to cover both of old and new ways of using TablePropertiesCollector. Reviewers: yhchiang, igor.sugak, rven, igor Reviewed By: rven, igor Subscribers: meyering, yoshinorim, maykov, leveldb, dhruba Differential Revision: https://reviews.facebook.net/D35373
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
// Copyright (c) 2014, 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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#pragma once
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#ifndef ROCKSDB_LITE
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#include <string>
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#include "rocksdb/table.h"
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#include "util/murmurhash.h"
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#include "rocksdb/options.h"
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namespace rocksdb {
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const uint32_t kCuckooMurmurSeedMultiplier = 816922183;
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static inline uint64_t CuckooHash(
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const Slice& user_key, uint32_t hash_cnt, bool use_module_hash,
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uint64_t table_size_, bool identity_as_first_hash,
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uint64_t (*get_slice_hash)(const Slice&, uint32_t, uint64_t)) {
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#ifndef NDEBUG
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// This part is used only in unit tests.
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if (get_slice_hash != nullptr) {
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return get_slice_hash(user_key, hash_cnt, table_size_);
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}
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#endif
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uint64_t value = 0;
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if (hash_cnt == 0 && identity_as_first_hash) {
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value = (*reinterpret_cast<const int64_t*>(user_key.data()));
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} else {
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value = MurmurHash(user_key.data(), static_cast<int>(user_key.size()),
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kCuckooMurmurSeedMultiplier * hash_cnt);
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}
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if (use_module_hash) {
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return value % table_size_;
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} else {
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return value & (table_size_ - 1);
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}
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}
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// Cuckoo Table is designed for applications that require fast point lookups
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// but not fast range scans.
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//
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// Some assumptions:
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// - Key length and Value length are fixed.
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// - Does not support Snapshot.
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// - Does not support Merge operations.
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class CuckooTableFactory : public TableFactory {
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public:
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explicit CuckooTableFactory(const CuckooTableOptions& table_options)
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: table_options_(table_options) {}
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~CuckooTableFactory() {}
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const char* Name() const override { return "CuckooTable"; }
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Status NewTableReader(
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const ImmutableCFOptions& ioptions, const EnvOptions& env_options,
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const InternalKeyComparator& internal_comparator,
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unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
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unique_ptr<TableReader>* table) const override;
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TableBuilder* NewTableBuilder(
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const TableBuilderOptions& table_builder_options,
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WritableFile* file) const override;
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// Sanitizes the specified DB Options.
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Status SanitizeOptions(const DBOptions& db_opts,
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const ColumnFamilyOptions& cf_opts) const override {
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return Status::OK();
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}
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std::string GetPrintableTableOptions() const override;
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private:
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const CuckooTableOptions table_options_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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