5b11124e39
Summary: Domas enlightened me about p100 (i.e., max) stats. Let's add them to our histograms. Closes https://github.com/facebook/rocksdb/pull/1968 Differential Revision: D4678716 Pulled By: ajkr fbshipit-source-id: 65e7118
466 lines
19 KiB
C++
466 lines
19 KiB
C++
// 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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#ifndef STORAGE_ROCKSDB_INCLUDE_STATISTICS_H_
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#define STORAGE_ROCKSDB_INCLUDE_STATISTICS_H_
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#include <atomic>
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#include <cstddef>
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#include <cstdint>
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#include <string>
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#include <memory>
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#include <vector>
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namespace rocksdb {
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/**
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* Keep adding ticker's here.
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* 1. Any ticker should be added before TICKER_ENUM_MAX.
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* 2. Add a readable string in TickersNameMap below for the newly added ticker.
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*/
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enum Tickers : uint32_t {
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// total block cache misses
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// REQUIRES: BLOCK_CACHE_MISS == BLOCK_CACHE_INDEX_MISS +
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// BLOCK_CACHE_FILTER_MISS +
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// BLOCK_CACHE_DATA_MISS;
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BLOCK_CACHE_MISS = 0,
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// total block cache hit
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// REQUIRES: BLOCK_CACHE_HIT == BLOCK_CACHE_INDEX_HIT +
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// BLOCK_CACHE_FILTER_HIT +
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// BLOCK_CACHE_DATA_HIT;
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BLOCK_CACHE_HIT,
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// # of blocks added to block cache.
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BLOCK_CACHE_ADD,
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// # of failures when adding blocks to block cache.
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BLOCK_CACHE_ADD_FAILURES,
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// # of times cache miss when accessing index block from block cache.
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BLOCK_CACHE_INDEX_MISS,
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// # of times cache hit when accessing index block from block cache.
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BLOCK_CACHE_INDEX_HIT,
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// # of index blocks added to block cache.
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BLOCK_CACHE_INDEX_ADD,
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// # of bytes of index blocks inserted into cache
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BLOCK_CACHE_INDEX_BYTES_INSERT,
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// # of bytes of index block erased from cache
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BLOCK_CACHE_INDEX_BYTES_EVICT,
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// # of times cache miss when accessing filter block from block cache.
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BLOCK_CACHE_FILTER_MISS,
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// # of times cache hit when accessing filter block from block cache.
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BLOCK_CACHE_FILTER_HIT,
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// # of filter blocks added to block cache.
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BLOCK_CACHE_FILTER_ADD,
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// # of bytes of bloom filter blocks inserted into cache
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BLOCK_CACHE_FILTER_BYTES_INSERT,
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// # of bytes of bloom filter block erased from cache
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BLOCK_CACHE_FILTER_BYTES_EVICT,
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// # of times cache miss when accessing data block from block cache.
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BLOCK_CACHE_DATA_MISS,
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// # of times cache hit when accessing data block from block cache.
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BLOCK_CACHE_DATA_HIT,
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// # of data blocks added to block cache.
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BLOCK_CACHE_DATA_ADD,
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// # of bytes of data blocks inserted into cache
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BLOCK_CACHE_DATA_BYTES_INSERT,
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// # of bytes read from cache.
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BLOCK_CACHE_BYTES_READ,
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// # of bytes written into cache.
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BLOCK_CACHE_BYTES_WRITE,
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// # of times bloom filter has avoided file reads.
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BLOOM_FILTER_USEFUL,
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// # persistent cache hit
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PERSISTENT_CACHE_HIT,
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// # persistent cache miss
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PERSISTENT_CACHE_MISS,
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// # total simulation block cache hits
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SIM_BLOCK_CACHE_HIT,
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// # total simulation block cache misses
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SIM_BLOCK_CACHE_MISS,
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// # of memtable hits.
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MEMTABLE_HIT,
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// # of memtable misses.
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MEMTABLE_MISS,
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// # of Get() queries served by L0
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GET_HIT_L0,
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// # of Get() queries served by L1
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GET_HIT_L1,
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// # of Get() queries served by L2 and up
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GET_HIT_L2_AND_UP,
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/**
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* COMPACTION_KEY_DROP_* count the reasons for key drop during compaction
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* There are 4 reasons currently.
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*/
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COMPACTION_KEY_DROP_NEWER_ENTRY, // key was written with a newer value.
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// Also includes keys dropped for range del.
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COMPACTION_KEY_DROP_OBSOLETE, // The key is obsolete.
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COMPACTION_KEY_DROP_RANGE_DEL, // key was covered by a range tombstone.
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COMPACTION_KEY_DROP_USER, // user compaction function has dropped the key.
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COMPACTION_RANGE_DEL_DROP_OBSOLETE, // all keys in range were deleted.
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// Number of keys written to the database via the Put and Write call's
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NUMBER_KEYS_WRITTEN,
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// Number of Keys read,
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NUMBER_KEYS_READ,
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// Number keys updated, if inplace update is enabled
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NUMBER_KEYS_UPDATED,
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// The number of uncompressed bytes issued by DB::Put(), DB::Delete(),
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// DB::Merge(), and DB::Write().
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BYTES_WRITTEN,
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// The number of uncompressed bytes read from DB::Get(). It could be
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// either from memtables, cache, or table files.
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// For the number of logical bytes read from DB::MultiGet(),
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// please use NUMBER_MULTIGET_BYTES_READ.
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BYTES_READ,
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// The number of calls to seek/next/prev
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NUMBER_DB_SEEK,
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NUMBER_DB_NEXT,
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NUMBER_DB_PREV,
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// The number of calls to seek/next/prev that returned data
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NUMBER_DB_SEEK_FOUND,
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NUMBER_DB_NEXT_FOUND,
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NUMBER_DB_PREV_FOUND,
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// The number of uncompressed bytes read from an iterator.
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// Includes size of key and value.
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ITER_BYTES_READ,
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NO_FILE_CLOSES,
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NO_FILE_OPENS,
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NO_FILE_ERRORS,
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// DEPRECATED Time system had to wait to do LO-L1 compactions
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STALL_L0_SLOWDOWN_MICROS,
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// DEPRECATED Time system had to wait to move memtable to L1.
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STALL_MEMTABLE_COMPACTION_MICROS,
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// DEPRECATED write throttle because of too many files in L0
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STALL_L0_NUM_FILES_MICROS,
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// Writer has to wait for compaction or flush to finish.
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STALL_MICROS,
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// The wait time for db mutex.
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// Disabled by default. To enable it set stats level to kAll
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DB_MUTEX_WAIT_MICROS,
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RATE_LIMIT_DELAY_MILLIS,
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NO_ITERATORS, // number of iterators currently open
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// Number of MultiGet calls, keys read, and bytes read
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NUMBER_MULTIGET_CALLS,
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NUMBER_MULTIGET_KEYS_READ,
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NUMBER_MULTIGET_BYTES_READ,
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// Number of deletes records that were not required to be
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// written to storage because key does not exist
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NUMBER_FILTERED_DELETES,
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NUMBER_MERGE_FAILURES,
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// number of times bloom was checked before creating iterator on a
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// file, and the number of times the check was useful in avoiding
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// iterator creation (and thus likely IOPs).
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BLOOM_FILTER_PREFIX_CHECKED,
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BLOOM_FILTER_PREFIX_USEFUL,
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// Number of times we had to reseek inside an iteration to skip
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// over large number of keys with same userkey.
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NUMBER_OF_RESEEKS_IN_ITERATION,
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// Record the number of calls to GetUpadtesSince. Useful to keep track of
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// transaction log iterator refreshes
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GET_UPDATES_SINCE_CALLS,
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BLOCK_CACHE_COMPRESSED_MISS, // miss in the compressed block cache
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BLOCK_CACHE_COMPRESSED_HIT, // hit in the compressed block cache
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// Number of blocks added to comopressed block cache
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BLOCK_CACHE_COMPRESSED_ADD,
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// Number of failures when adding blocks to compressed block cache
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BLOCK_CACHE_COMPRESSED_ADD_FAILURES,
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WAL_FILE_SYNCED, // Number of times WAL sync is done
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WAL_FILE_BYTES, // Number of bytes written to WAL
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// Writes can be processed by requesting thread or by the thread at the
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// head of the writers queue.
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WRITE_DONE_BY_SELF,
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WRITE_DONE_BY_OTHER, // Equivalent to writes done for others
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WRITE_TIMEDOUT, // Number of writes ending up with timed-out.
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WRITE_WITH_WAL, // Number of Write calls that request WAL
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COMPACT_READ_BYTES, // Bytes read during compaction
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COMPACT_WRITE_BYTES, // Bytes written during compaction
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FLUSH_WRITE_BYTES, // Bytes written during flush
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// Number of table's properties loaded directly from file, without creating
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// table reader object.
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NUMBER_DIRECT_LOAD_TABLE_PROPERTIES,
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NUMBER_SUPERVERSION_ACQUIRES,
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NUMBER_SUPERVERSION_RELEASES,
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NUMBER_SUPERVERSION_CLEANUPS,
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// # of compressions/decompressions executed
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NUMBER_BLOCK_COMPRESSED,
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NUMBER_BLOCK_DECOMPRESSED,
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NUMBER_BLOCK_NOT_COMPRESSED,
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MERGE_OPERATION_TOTAL_TIME,
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FILTER_OPERATION_TOTAL_TIME,
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// Row cache.
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ROW_CACHE_HIT,
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ROW_CACHE_MISS,
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// Read amplification statistics.
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// Read amplification can be calculated using this formula
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// (READ_AMP_TOTAL_READ_BYTES / READ_AMP_ESTIMATE_USEFUL_BYTES)
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//
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// REQUIRES: ReadOptions::read_amp_bytes_per_bit to be enabled
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READ_AMP_ESTIMATE_USEFUL_BYTES, // Estimate of total bytes actually used.
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READ_AMP_TOTAL_READ_BYTES, // Total size of loaded data blocks.
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// Number of refill intervals where rate limiter's bytes are fully consumed.
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NUMBER_RATE_LIMITER_DRAINS,
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TICKER_ENUM_MAX
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};
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// The order of items listed in Tickers should be the same as
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// the order listed in TickersNameMap
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const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
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{BLOCK_CACHE_MISS, "rocksdb.block.cache.miss"},
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{BLOCK_CACHE_HIT, "rocksdb.block.cache.hit"},
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{BLOCK_CACHE_ADD, "rocksdb.block.cache.add"},
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{BLOCK_CACHE_ADD_FAILURES, "rocksdb.block.cache.add.failures"},
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{BLOCK_CACHE_INDEX_MISS, "rocksdb.block.cache.index.miss"},
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{BLOCK_CACHE_INDEX_HIT, "rocksdb.block.cache.index.hit"},
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{BLOCK_CACHE_INDEX_ADD, "rocksdb.block.cache.index.add"},
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{BLOCK_CACHE_INDEX_BYTES_INSERT, "rocksdb.block.cache.index.bytes.insert"},
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{BLOCK_CACHE_INDEX_BYTES_EVICT, "rocksdb.block.cache.index.bytes.evict"},
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{BLOCK_CACHE_FILTER_MISS, "rocksdb.block.cache.filter.miss"},
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{BLOCK_CACHE_FILTER_HIT, "rocksdb.block.cache.filter.hit"},
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{BLOCK_CACHE_FILTER_ADD, "rocksdb.block.cache.filter.add"},
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{BLOCK_CACHE_FILTER_BYTES_INSERT,
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"rocksdb.block.cache.filter.bytes.insert"},
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{BLOCK_CACHE_FILTER_BYTES_EVICT, "rocksdb.block.cache.filter.bytes.evict"},
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{BLOCK_CACHE_DATA_MISS, "rocksdb.block.cache.data.miss"},
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{BLOCK_CACHE_DATA_HIT, "rocksdb.block.cache.data.hit"},
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{BLOCK_CACHE_DATA_ADD, "rocksdb.block.cache.data.add"},
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{BLOCK_CACHE_DATA_BYTES_INSERT, "rocksdb.block.cache.data.bytes.insert"},
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{BLOCK_CACHE_BYTES_READ, "rocksdb.block.cache.bytes.read"},
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{BLOCK_CACHE_BYTES_WRITE, "rocksdb.block.cache.bytes.write"},
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{BLOOM_FILTER_USEFUL, "rocksdb.bloom.filter.useful"},
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{PERSISTENT_CACHE_HIT, "rocksdb.persistent.cache.hit"},
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{PERSISTENT_CACHE_MISS, "rocksdb.persistent.cache.miss"},
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{SIM_BLOCK_CACHE_HIT, "rocksdb.sim.block.cache.hit"},
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{SIM_BLOCK_CACHE_MISS, "rocksdb.sim.block.cache.miss"},
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{MEMTABLE_HIT, "rocksdb.memtable.hit"},
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{MEMTABLE_MISS, "rocksdb.memtable.miss"},
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{GET_HIT_L0, "rocksdb.l0.hit"},
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{GET_HIT_L1, "rocksdb.l1.hit"},
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{GET_HIT_L2_AND_UP, "rocksdb.l2andup.hit"},
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{COMPACTION_KEY_DROP_NEWER_ENTRY, "rocksdb.compaction.key.drop.new"},
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{COMPACTION_KEY_DROP_OBSOLETE, "rocksdb.compaction.key.drop.obsolete"},
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{COMPACTION_KEY_DROP_RANGE_DEL, "rocksdb.compaction.key.drop.range_del"},
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{COMPACTION_KEY_DROP_USER, "rocksdb.compaction.key.drop.user"},
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{COMPACTION_RANGE_DEL_DROP_OBSOLETE,
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"rocksdb.compaction.range_del.drop.obsolete"},
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{NUMBER_KEYS_WRITTEN, "rocksdb.number.keys.written"},
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{NUMBER_KEYS_READ, "rocksdb.number.keys.read"},
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{NUMBER_KEYS_UPDATED, "rocksdb.number.keys.updated"},
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{BYTES_WRITTEN, "rocksdb.bytes.written"},
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{BYTES_READ, "rocksdb.bytes.read"},
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{NUMBER_DB_SEEK, "rocksdb.number.db.seek"},
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{NUMBER_DB_NEXT, "rocksdb.number.db.next"},
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{NUMBER_DB_PREV, "rocksdb.number.db.prev"},
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{NUMBER_DB_SEEK_FOUND, "rocksdb.number.db.seek.found"},
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{NUMBER_DB_NEXT_FOUND, "rocksdb.number.db.next.found"},
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{NUMBER_DB_PREV_FOUND, "rocksdb.number.db.prev.found"},
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{ITER_BYTES_READ, "rocksdb.db.iter.bytes.read"},
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{NO_FILE_CLOSES, "rocksdb.no.file.closes"},
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{NO_FILE_OPENS, "rocksdb.no.file.opens"},
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{NO_FILE_ERRORS, "rocksdb.no.file.errors"},
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{STALL_L0_SLOWDOWN_MICROS, "rocksdb.l0.slowdown.micros"},
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{STALL_MEMTABLE_COMPACTION_MICROS, "rocksdb.memtable.compaction.micros"},
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{STALL_L0_NUM_FILES_MICROS, "rocksdb.l0.num.files.stall.micros"},
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{STALL_MICROS, "rocksdb.stall.micros"},
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{DB_MUTEX_WAIT_MICROS, "rocksdb.db.mutex.wait.micros"},
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{RATE_LIMIT_DELAY_MILLIS, "rocksdb.rate.limit.delay.millis"},
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{NO_ITERATORS, "rocksdb.num.iterators"},
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{NUMBER_MULTIGET_CALLS, "rocksdb.number.multiget.get"},
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{NUMBER_MULTIGET_KEYS_READ, "rocksdb.number.multiget.keys.read"},
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{NUMBER_MULTIGET_BYTES_READ, "rocksdb.number.multiget.bytes.read"},
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{NUMBER_FILTERED_DELETES, "rocksdb.number.deletes.filtered"},
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{NUMBER_MERGE_FAILURES, "rocksdb.number.merge.failures"},
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{BLOOM_FILTER_PREFIX_CHECKED, "rocksdb.bloom.filter.prefix.checked"},
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{BLOOM_FILTER_PREFIX_USEFUL, "rocksdb.bloom.filter.prefix.useful"},
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{NUMBER_OF_RESEEKS_IN_ITERATION, "rocksdb.number.reseeks.iteration"},
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{GET_UPDATES_SINCE_CALLS, "rocksdb.getupdatessince.calls"},
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{BLOCK_CACHE_COMPRESSED_MISS, "rocksdb.block.cachecompressed.miss"},
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{BLOCK_CACHE_COMPRESSED_HIT, "rocksdb.block.cachecompressed.hit"},
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{BLOCK_CACHE_COMPRESSED_ADD, "rocksdb.block.cachecompressed.add"},
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{BLOCK_CACHE_COMPRESSED_ADD_FAILURES,
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"rocksdb.block.cachecompressed.add.failures"},
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{WAL_FILE_SYNCED, "rocksdb.wal.synced"},
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{WAL_FILE_BYTES, "rocksdb.wal.bytes"},
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{WRITE_DONE_BY_SELF, "rocksdb.write.self"},
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{WRITE_DONE_BY_OTHER, "rocksdb.write.other"},
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{WRITE_TIMEDOUT, "rocksdb.write.timeout"},
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{WRITE_WITH_WAL, "rocksdb.write.wal"},
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{COMPACT_READ_BYTES, "rocksdb.compact.read.bytes"},
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{COMPACT_WRITE_BYTES, "rocksdb.compact.write.bytes"},
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{FLUSH_WRITE_BYTES, "rocksdb.flush.write.bytes"},
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{NUMBER_DIRECT_LOAD_TABLE_PROPERTIES,
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"rocksdb.number.direct.load.table.properties"},
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{NUMBER_SUPERVERSION_ACQUIRES, "rocksdb.number.superversion_acquires"},
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{NUMBER_SUPERVERSION_RELEASES, "rocksdb.number.superversion_releases"},
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{NUMBER_SUPERVERSION_CLEANUPS, "rocksdb.number.superversion_cleanups"},
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{NUMBER_BLOCK_COMPRESSED, "rocksdb.number.block.compressed"},
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{NUMBER_BLOCK_DECOMPRESSED, "rocksdb.number.block.decompressed"},
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{NUMBER_BLOCK_NOT_COMPRESSED, "rocksdb.number.block.not_compressed"},
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{MERGE_OPERATION_TOTAL_TIME, "rocksdb.merge.operation.time.nanos"},
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{FILTER_OPERATION_TOTAL_TIME, "rocksdb.filter.operation.time.nanos"},
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{ROW_CACHE_HIT, "rocksdb.row.cache.hit"},
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{ROW_CACHE_MISS, "rocksdb.row.cache.miss"},
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{READ_AMP_ESTIMATE_USEFUL_BYTES, "rocksdb.read.amp.estimate.useful.bytes"},
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{READ_AMP_TOTAL_READ_BYTES, "rocksdb.read.amp.total.read.bytes"},
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{NUMBER_RATE_LIMITER_DRAINS, "rocksdb.number.rate_limiter.drains"},
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};
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/**
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* Keep adding histogram's here.
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* Any histogram whould have value less than HISTOGRAM_ENUM_MAX
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* Add a new Histogram by assigning it the current value of HISTOGRAM_ENUM_MAX
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* Add a string representation in HistogramsNameMap below
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* And increment HISTOGRAM_ENUM_MAX
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*/
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enum Histograms : uint32_t {
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DB_GET = 0,
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DB_WRITE,
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COMPACTION_TIME,
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SUBCOMPACTION_SETUP_TIME,
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TABLE_SYNC_MICROS,
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COMPACTION_OUTFILE_SYNC_MICROS,
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WAL_FILE_SYNC_MICROS,
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MANIFEST_FILE_SYNC_MICROS,
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// TIME SPENT IN IO DURING TABLE OPEN
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TABLE_OPEN_IO_MICROS,
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DB_MULTIGET,
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READ_BLOCK_COMPACTION_MICROS,
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READ_BLOCK_GET_MICROS,
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WRITE_RAW_BLOCK_MICROS,
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STALL_L0_SLOWDOWN_COUNT,
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STALL_MEMTABLE_COMPACTION_COUNT,
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STALL_L0_NUM_FILES_COUNT,
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HARD_RATE_LIMIT_DELAY_COUNT,
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SOFT_RATE_LIMIT_DELAY_COUNT,
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NUM_FILES_IN_SINGLE_COMPACTION,
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DB_SEEK,
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WRITE_STALL,
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SST_READ_MICROS,
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// The number of subcompactions actually scheduled during a compaction
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NUM_SUBCOMPACTIONS_SCHEDULED,
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// Value size distribution in each operation
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BYTES_PER_READ,
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BYTES_PER_WRITE,
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BYTES_PER_MULTIGET,
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// number of bytes compressed/decompressed
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// number of bytes is when uncompressed; i.e. before/after respectively
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BYTES_COMPRESSED,
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BYTES_DECOMPRESSED,
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COMPRESSION_TIMES_NANOS,
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DECOMPRESSION_TIMES_NANOS,
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HISTOGRAM_ENUM_MAX, // TODO(ldemailly): enforce HistogramsNameMap match
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};
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const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = {
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{DB_GET, "rocksdb.db.get.micros"},
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{DB_WRITE, "rocksdb.db.write.micros"},
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{COMPACTION_TIME, "rocksdb.compaction.times.micros"},
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{SUBCOMPACTION_SETUP_TIME, "rocksdb.subcompaction.setup.times.micros"},
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{TABLE_SYNC_MICROS, "rocksdb.table.sync.micros"},
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{COMPACTION_OUTFILE_SYNC_MICROS, "rocksdb.compaction.outfile.sync.micros"},
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{WAL_FILE_SYNC_MICROS, "rocksdb.wal.file.sync.micros"},
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{MANIFEST_FILE_SYNC_MICROS, "rocksdb.manifest.file.sync.micros"},
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{TABLE_OPEN_IO_MICROS, "rocksdb.table.open.io.micros"},
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{DB_MULTIGET, "rocksdb.db.multiget.micros"},
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|
{READ_BLOCK_COMPACTION_MICROS, "rocksdb.read.block.compaction.micros"},
|
|
{READ_BLOCK_GET_MICROS, "rocksdb.read.block.get.micros"},
|
|
{WRITE_RAW_BLOCK_MICROS, "rocksdb.write.raw.block.micros"},
|
|
{STALL_L0_SLOWDOWN_COUNT, "rocksdb.l0.slowdown.count"},
|
|
{STALL_MEMTABLE_COMPACTION_COUNT, "rocksdb.memtable.compaction.count"},
|
|
{STALL_L0_NUM_FILES_COUNT, "rocksdb.num.files.stall.count"},
|
|
{HARD_RATE_LIMIT_DELAY_COUNT, "rocksdb.hard.rate.limit.delay.count"},
|
|
{SOFT_RATE_LIMIT_DELAY_COUNT, "rocksdb.soft.rate.limit.delay.count"},
|
|
{NUM_FILES_IN_SINGLE_COMPACTION, "rocksdb.numfiles.in.singlecompaction"},
|
|
{DB_SEEK, "rocksdb.db.seek.micros"},
|
|
{WRITE_STALL, "rocksdb.db.write.stall"},
|
|
{SST_READ_MICROS, "rocksdb.sst.read.micros"},
|
|
{NUM_SUBCOMPACTIONS_SCHEDULED, "rocksdb.num.subcompactions.scheduled"},
|
|
{BYTES_PER_READ, "rocksdb.bytes.per.read"},
|
|
{BYTES_PER_WRITE, "rocksdb.bytes.per.write"},
|
|
{BYTES_PER_MULTIGET, "rocksdb.bytes.per.multiget"},
|
|
{BYTES_COMPRESSED, "rocksdb.bytes.compressed"},
|
|
{BYTES_DECOMPRESSED, "rocksdb.bytes.decompressed"},
|
|
{COMPRESSION_TIMES_NANOS, "rocksdb.compression.times.nanos"},
|
|
{DECOMPRESSION_TIMES_NANOS, "rocksdb.decompression.times.nanos"},
|
|
};
|
|
|
|
struct HistogramData {
|
|
double median;
|
|
double percentile95;
|
|
double percentile99;
|
|
double average;
|
|
double standard_deviation;
|
|
// zero-initialize new members since old Statistics::histogramData()
|
|
// implementations won't write them.
|
|
double max = 0.0;
|
|
};
|
|
|
|
enum StatsLevel {
|
|
// Collect all stats except time inside mutex lock AND time spent on
|
|
// compression.
|
|
kExceptDetailedTimers,
|
|
// Collect all stats except the counters requiring to get time inside the
|
|
// mutex lock.
|
|
kExceptTimeForMutex,
|
|
// Collect all stats, including measuring duration of mutex operations.
|
|
// If getting time is expensive on the platform to run, it can
|
|
// reduce scalability to more threads, especially for writes.
|
|
kAll,
|
|
};
|
|
|
|
// Analyze the performance of a db
|
|
class Statistics {
|
|
public:
|
|
virtual ~Statistics() {}
|
|
|
|
virtual uint64_t getTickerCount(uint32_t tickerType) const = 0;
|
|
virtual void histogramData(uint32_t type,
|
|
HistogramData* const data) const = 0;
|
|
virtual std::string getHistogramString(uint32_t type) const { return ""; }
|
|
virtual void recordTick(uint32_t tickerType, uint64_t count = 0) = 0;
|
|
virtual void setTickerCount(uint32_t tickerType, uint64_t count) = 0;
|
|
virtual uint64_t getAndResetTickerCount(uint32_t tickerType) = 0;
|
|
virtual void measureTime(uint32_t histogramType, uint64_t time) = 0;
|
|
|
|
// String representation of the statistic object.
|
|
virtual std::string ToString() const {
|
|
// Do nothing by default
|
|
return std::string("ToString(): not implemented");
|
|
}
|
|
|
|
// Override this function to disable particular histogram collection
|
|
virtual bool HistEnabledForType(uint32_t type) const {
|
|
return type < HISTOGRAM_ENUM_MAX;
|
|
}
|
|
|
|
StatsLevel stats_level_ = kExceptDetailedTimers;
|
|
};
|
|
|
|
// Create a concrete DBStatistics object
|
|
std::shared_ptr<Statistics> CreateDBStatistics();
|
|
|
|
} // namespace rocksdb
|
|
|
|
#endif // STORAGE_ROCKSDB_INCLUDE_STATISTICS_H_
|