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86ef6c3f74
Summary: So far we only have key/value pairs as well as bloom filter stored in the sst file. It will be great if we are able to store more metadata about this table itself, for example, the entry size, bloom filter name, etc. This diff is the first step of this effort. It allows table to keep the basic statistics mentioned in http://fburl.com/14995441, as well as allowing writing user-collected stats to stats block. After this diff, we will figure out the interface of how to allow user to collect their interested statistics. Test Plan: 1. Added several unit tests. 2. Ran `make check` to ensure it doesn't break other tests. Reviewers: dhruba, haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D13419
43 lines
1.2 KiB
C++
43 lines
1.2 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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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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// TODO(kailiu) we do not support user collected stats yet.
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//
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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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// user collected stats
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UserCollectedStats user_collected_stats;
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};
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} // namespace rocksdb
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