994575c134
Summary: 1. Added a new option that support user-defined table stats collection. 2. Added a deleted key stats collector in `utilities` Test Plan: Added a unit test for newly added code. Also ran make check to make sure other tests are not broken. Reviewers: dhruba, haobo Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D13491
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
// Copyright (c) 2013 Facebook
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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 <string>
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#include <unordered_map>
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#include "rocksdb/status.h"
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namespace rocksdb {
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// TableStats contains a bunch of read-only stats of its associated
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// table.
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struct TableStats {
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public:
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// Other than basic table stats, each table may also have the user
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// collected stats.
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// The value of the user-collected stats are encoded as raw bytes --
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// users have to interprete these values by themselves.
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typedef
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std::unordered_map<std::string, std::string>
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UserCollectedStats;
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// the total size of all data blocks.
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uint64_t data_size = 0;
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// the total size of all index blocks.
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uint64_t index_size = 0;
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// total raw key size
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uint64_t raw_key_size = 0;
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// total raw value size
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uint64_t raw_value_size = 0;
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// the number of blocks in this table
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uint64_t num_data_blocks = 0;
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// the number of entries in this table
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uint64_t num_entries = 0;
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// The name of the filter policy used in this table.
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// If no filter policy is used, `filter_policy_name` will be an empty string.
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std::string filter_policy_name;
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// user collected stats
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UserCollectedStats user_collected_stats;
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};
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// `TableStatsCollector` provides the mechanism for users to collect their own
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// interested stats. This class is essentially a collection of callback
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// functions that will be invoked during table building.
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class TableStatsCollector {
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public:
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virtual ~TableStatsCollector() { }
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// Add() will be called when a new key/value pair is inserted into the table.
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// @params key the original key that is inserted into the table.
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// @params value the original value that is inserted into the table.
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virtual Status Add(const Slice& key, const Slice& value) = 0;
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// Finish() will be called when a table has already been built and is ready
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// for writing the stats block.
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// @params stats User will add their collected statistics to `stats`.
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virtual Status Finish(TableStats::UserCollectedStats* stats) = 0;
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// The name of the stats collector can be used for debugging purpose.
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virtual const char* Name() const = 0;
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};
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} // namespace rocksdb
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