12b6cdeed3
Summary: A framework for tracing and replaying RocksDB operations. A binary trace file is created by capturing the DB operations, and it can be replayed back at the same rate using db_bench. - Column-families are supported - Multi-threaded tracing is supported. - TraceReader and TraceWriter are exposed to the user, so that tracing to various destinations can be enabled (say, to other messaging/logging services). By default, a FileTraceReader and FileTraceWriter are implemented to capture to a file and replay from it. - This is not yet ideal to be enabled in production due to large performance overhead, but it can be safely tried out in a shadow setup, say, for analyzing RocksDB operations. Currently supported DB operations: - Writes: -- Put -- Merge -- Delete -- SingleDelete -- DeleteRange -- Write - Reads: -- Get (point lookups) Pull Request resolved: https://github.com/facebook/rocksdb/pull/3837 Differential Revision: D7974837 Pulled By: sagar0 fbshipit-source-id: 8ec65aaf336504bc1f6ed0feae67f6ed5ef97a72
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include "rocksdb/trace_reader_writer.h"
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namespace rocksdb {
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class RandomAccessFileReader;
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class WritableFileWriter;
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// FileTraceReader allows reading RocksDB traces from a file.
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class FileTraceReader : public TraceReader {
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public:
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explicit FileTraceReader(std::unique_ptr<RandomAccessFileReader>&& reader);
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~FileTraceReader();
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virtual Status Read(std::string* data) override;
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virtual Status Close() override;
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private:
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unique_ptr<RandomAccessFileReader> file_reader_;
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Slice result_;
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size_t offset_;
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char* const buffer_;
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static const unsigned int kBufferSize;
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};
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// FileTraceWriter allows writing RocksDB traces to a file.
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class FileTraceWriter : public TraceWriter {
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public:
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explicit FileTraceWriter(std::unique_ptr<WritableFileWriter>&& file_writer)
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: file_writer_(std::move(file_writer)) {}
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~FileTraceWriter();
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virtual Status Write(const Slice& data) override;
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virtual Status Close() override;
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private:
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unique_ptr<WritableFileWriter> file_writer_;
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};
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} // namespace rocksdb
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