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/D62523main
Islam AbdelRahman
8 years ago
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d346ba2468
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// 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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