c4f5d0aa15
Summary: This PR adds public `GetStatsHistory` API to retrieve stats history in the form of an std map. The key of the map is the timestamp in microseconds when the stats snapshot is taken, the value is another std map from stats name to stats value (stored in std string). Two DBOptions are introduced: `stats_persist_period_sec` (default 10 minutes) controls the intervals between two snapshots are taken; `max_stats_history_count` (default 10) controls the max number of history snapshots to keep in memory. RocksDB will stop collecting stats snapshots if `stats_persist_period_sec` is set to 0. (This PR is the in-memory part of https://github.com/facebook/rocksdb/pull/4535) Pull Request resolved: https://github.com/facebook/rocksdb/pull/4748 Differential Revision: D13961471 Pulled By: miasantreble fbshipit-source-id: ac836d401ecb84ea92216bf9966f969dedf4ad04
56 lines
1.8 KiB
C++
56 lines
1.8 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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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include "rocksdb/stats_history.h"
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namespace rocksdb {
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class InMemoryStatsHistoryIterator final : public StatsHistoryIterator {
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public:
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InMemoryStatsHistoryIterator(uint64_t start_time, uint64_t end_time,
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DBImpl* db_impl)
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: start_time_(start_time),
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end_time_(end_time),
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valid_(true),
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db_impl_(db_impl) {
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AdvanceIteratorByTime(start_time_, end_time_);
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}
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~InMemoryStatsHistoryIterator() override;
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bool Valid() const override;
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Status status() const override;
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void Next() override;
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uint64_t GetStatsTime() const override;
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const std::map<std::string, uint64_t>& GetStatsMap() const override;
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private:
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// advance the iterator to the next stats history record with timestamp
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// between [start_time, end_time)
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void AdvanceIteratorByTime(uint64_t start_time, uint64_t end_time);
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// No copying allowed
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InMemoryStatsHistoryIterator(const InMemoryStatsHistoryIterator&) = delete;
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void operator=(const InMemoryStatsHistoryIterator&) = delete;
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InMemoryStatsHistoryIterator(InMemoryStatsHistoryIterator&&) = delete;
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InMemoryStatsHistoryIterator& operator=(InMemoryStatsHistoryIterator&&) =
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delete;
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uint64_t time_;
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uint64_t start_time_;
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uint64_t end_time_;
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std::map<std::string, uint64_t> stats_map_;
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Status status_;
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bool valid_;
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DBImpl* db_impl_;
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};
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} // namespace rocksdb
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