fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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.
60 lines
2.5 KiB
60 lines
2.5 KiB
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
#include "table/cuckoo_table_factory.h"
|
|
|
|
#include "db/dbformat.h"
|
|
#include "table/cuckoo_table_builder.h"
|
|
#include "table/cuckoo_table_reader.h"
|
|
#include "util/murmurhash.h"
|
|
|
|
namespace rocksdb {
|
|
extern const uint32_t kMaxNumHashTable = 64;
|
|
|
|
extern uint64_t GetSliceMurmurHash(const Slice& s, uint32_t index,
|
|
uint64_t max_num_buckets) {
|
|
static constexpr uint32_t seeds[kMaxNumHashTable] = {
|
|
816922183, 506425713, 949485004, 22513986, 421427259, 500437285,
|
|
888981693, 847587269, 511007211, 722295391, 934013645, 566947683,
|
|
193618736, 428277388, 770956674, 819994962, 755946528, 40807421,
|
|
263144466, 241420041, 444294464, 731606396, 304158902, 563235655,
|
|
968740453, 336996831, 462831574, 407970157, 985877240, 637708754,
|
|
736932700, 205026023, 755371467, 729648411, 807744117, 46482135,
|
|
847092855, 620960699, 102476362, 314094354, 625838942, 550889395,
|
|
639071379, 834567510, 397667304, 151945969, 443634243, 196618243,
|
|
421986347, 407218337, 964502417, 327741231, 493359459, 452453139,
|
|
692216398, 108161624, 816246924, 234779764, 618949448, 496133787,
|
|
156374056, 316589799, 982915425, 553105889 };
|
|
return MurmurHash(s.data(), s.size(), seeds[index]) % max_num_buckets;
|
|
}
|
|
|
|
Status CuckooTableFactory::NewTableReader(const Options& options,
|
|
const EnvOptions& soptions, const InternalKeyComparator& icomp,
|
|
std::unique_ptr<RandomAccessFile>&& file, uint64_t file_size,
|
|
std::unique_ptr<TableReader>* table) const {
|
|
std::unique_ptr<CuckooTableReader> new_reader(new CuckooTableReader(options,
|
|
std::move(file), file_size, GetSliceMurmurHash));
|
|
Status s = new_reader->status();
|
|
if (s.ok()) {
|
|
*table = std::move(new_reader);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
TableBuilder* CuckooTableFactory::NewTableBuilder(
|
|
const Options& options, const InternalKeyComparator& internal_comparator,
|
|
WritableFile* file, CompressionType compression_type) const {
|
|
return new CuckooTableBuilder(file, hash_table_ratio_, kMaxNumHashTable,
|
|
max_search_depth_, GetSliceMurmurHash);
|
|
}
|
|
|
|
TableFactory* NewCuckooTableFactory(double hash_table_ratio,
|
|
uint32_t max_search_depth) {
|
|
return new CuckooTableFactory(hash_table_ratio, max_search_depth);
|
|
}
|
|
|
|
} // namespace rocksdb
|
|
#endif // ROCKSDB_LITE
|
|
|