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https://github.com/facebook/rocksdb.git
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ab01da5437
Summary: - Update SstFileWriter to include a property for a global sequence number in the SST file `rocksdb.external_sst_file.global_seqno` - Update TableProperties to be aware of the offset of each property in the file - Update BlockBasedTableReader and Block to be able to honor the sequence number in `rocksdb.external_sst_file.global_seqno` property and use it to overwrite all sequence number in the file Something worth mentioning is that we don't update the seqno in the index block since and when doing a binary search, the reason for that is that it's guaranteed that SST files with global seqno will have only one user_key and each key will have seqno=0 encoded in it, This mean that this key is greater than any other key with seqno> 0. That mean that we can actually keep the current logic for these blocks Test Plan: unit tests Reviewers: andrewkr, yhchiang, yiwu, sdong Reviewed By: sdong Subscribers: hcz, andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D62523
85 lines
2.8 KiB
C++
85 lines
2.8 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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#pragma once
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#include <string>
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#include "rocksdb/types.h"
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#include "util/string_util.h"
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namespace rocksdb {
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// Table Properties that are specific to tables created by SstFileWriter.
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struct ExternalSstFilePropertyNames {
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// value of this property is a fixed uint32 number.
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static const std::string kVersion;
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// value of this property is a fixed uint64 number.
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static const std::string kGlobalSeqno;
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};
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// PropertiesCollector used to add properties specific to tables
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// generated by SstFileWriter
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class SstFileWriterPropertiesCollector : public IntTblPropCollector {
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public:
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explicit SstFileWriterPropertiesCollector(int32_t version,
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SequenceNumber global_seqno)
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: version_(version), global_seqno_(global_seqno) {}
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virtual Status InternalAdd(const Slice& key, const Slice& value,
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uint64_t file_size) override {
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// Intentionally left blank. Have no interest in collecting stats for
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// individual key/value pairs.
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return Status::OK();
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}
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virtual Status Finish(UserCollectedProperties* properties) override {
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// File version
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std::string version_val;
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PutFixed32(&version_val, static_cast<uint32_t>(version_));
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properties->insert({ExternalSstFilePropertyNames::kVersion, version_val});
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// Global Sequence number
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std::string seqno_val;
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PutFixed64(&seqno_val, static_cast<uint64_t>(global_seqno_));
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properties->insert({ExternalSstFilePropertyNames::kGlobalSeqno, seqno_val});
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return Status::OK();
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}
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virtual const char* Name() const override {
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return "SstFileWriterPropertiesCollector";
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}
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virtual UserCollectedProperties GetReadableProperties() const override {
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return {{ExternalSstFilePropertyNames::kVersion, ToString(version_)}};
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}
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private:
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int32_t version_;
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SequenceNumber global_seqno_;
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};
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class SstFileWriterPropertiesCollectorFactory
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: public IntTblPropCollectorFactory {
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public:
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explicit SstFileWriterPropertiesCollectorFactory(int32_t version,
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SequenceNumber global_seqno)
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: version_(version), global_seqno_(global_seqno) {}
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virtual IntTblPropCollector* CreateIntTblPropCollector(
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uint32_t column_family_id) override {
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return new SstFileWriterPropertiesCollector(version_, global_seqno_);
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}
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virtual const char* Name() const override {
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return "SstFileWriterPropertiesCollector";
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}
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private:
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int32_t version_;
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SequenceNumber global_seqno_;
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};
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} // namespace rocksdb
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