4142a3e783
Summary:
- New Uint64 comparator
- Modify Reader and Builder to take custom user comparators instead of bytewise comparator
- Modify logic for choosing unused user key in builder
- Modify iterator logic in reader
- test changes
Test Plan:
cuckoo_table_{builder,reader,db}_test
make check all
Reviewers: ljin, sdong
Reviewed By: ljin
Subscribers: dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D22377
57 lines
1.8 KiB
C++
57 lines
1.8 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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namespace rocksdb {
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extern uint64_t GetSliceMurmurHash(const Slice& s, uint32_t index,
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uint64_t max_num_buckets);
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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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CuckooTableFactory(double hash_table_ratio, uint32_t max_search_depth)
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: hash_table_ratio_(hash_table_ratio),
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max_search_depth_(max_search_depth) {}
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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 Options& options, const EnvOptions& soptions,
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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(const Options& options,
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const InternalKeyComparator& icomparator, WritableFile* file,
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CompressionType compression_type) const override;
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// Sanitizes the specified DB Options.
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Status SanitizeDBOptions(DBOptions* db_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 double hash_table_ratio_;
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const uint32_t max_search_depth_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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