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This commit is contained in:
Ankit Gupta 2014-04-14 21:08:04 -07:00
parent a044398260
commit c199e0e2a4
3 changed files with 184 additions and 0 deletions
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30
java/org/rocksdb/Statistics.java Normal file
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
package org.rocksdb;
/**
* Statistics to analyze the performance of a db. Pointer for statistics object
* is managed by Options class.
*/
public class Statistics {
private long statsHandle_;
public Statistics(long statsHandle) {
statsHandle_ = statsHandle;
}
public long getTickerCount(StatisticsType statisticsType) {
assert(isInitialized());
return getTickerCount0(statisticsType.getValue(), statsHandle_);
}
private boolean isInitialized() {
return (statsHandle_ != 0);
}
private native long getTickerCount0(int ticker, long handle);
}

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java/org/rocksdb/StatisticsType.java Normal file
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
package org.rocksdb;
public enum StatisticsType {
// total block cache misses
// REQUIRES: BLOCK_CACHE_MISS == BLOCK_CACHE_INDEX_MISS +
// BLOCK_CACHE_FILTER_MISS +
// BLOCK_CACHE_DATA_MISS;
BLOCK_CACHE_MISS(0),
// total block cache hit
// REQUIRES: BLOCK_CACHE_HIT == BLOCK_CACHE_INDEX_HIT +
// BLOCK_CACHE_FILTER_HIT +
// BLOCK_CACHE_DATA_HIT;
BLOCK_CACHE_HIT(1),
// # of blocks added to block cache.
BLOCK_CACHE_ADD(2),
// # of times cache miss when accessing index block from block cache.
BLOCK_CACHE_INDEX_MISS(3),
// # of times cache hit when accessing index block from block cache.
BLOCK_CACHE_INDEX_HIT(4),
// # of times cache miss when accessing filter block from block cache.
BLOCK_CACHE_FILTER_MISS(5),
// # of times cache hit when accessing filter block from block cache.
BLOCK_CACHE_FILTER_HIT(6),
// # of times cache miss when accessing data block from block cache.
BLOCK_CACHE_DATA_MISS(7),
// # of times cache hit when accessing data block from block cache.
BLOCK_CACHE_DATA_HIT(8),
// # of times bloom filter has avoided file reads.
BLOOM_FILTER_USEFUL(9),
// # of memtable hits.
MEMTABLE_HIT(10),
// # of memtable misses.
MEMTABLE_MISS(11),
/**
* COMPACTION_KEY_DROP_* count the reasons for key drop during compaction
* There are 3 reasons currently.
*/
COMPACTION_KEY_DROP_NEWER_ENTRY(12), // key was written with a newer value.
COMPACTION_KEY_DROP_OBSOLETE(13), // The key is obsolete.
COMPACTION_KEY_DROP_USER(14), // user compaction function has dropped the key.
// Number of keys written to the database via the Put and Write call's
NUMBER_KEYS_WRITTEN(15),
// Number of Keys read,
NUMBER_KEYS_READ(16),
// Number keys updated, if inplace update is enabled
NUMBER_KEYS_UPDATED(17),
// Bytes written / read
BYTES_WRITTEN(18),
BYTES_READ(19),
NO_FILE_CLOSES(20),
NO_FILE_OPENS(21),
NO_FILE_ERRORS(22),
// Time system had to wait to do LO-L1 compactions
STALL_L0_SLOWDOWN_MICROS(23),
// Time system had to wait to move memtable to L1.
STALL_MEMTABLE_COMPACTION_MICROS(24),
// write throttle because of too many files in L0
STALL_L0_NUM_FILES_MICROS(25),
RATE_LIMIT_DELAY_MILLIS(26),
NO_ITERATORS(27), // number of iterators currently open
// Number of MultiGet calls, keys read, and bytes read
NUMBER_MULTIGET_CALLS(28),
NUMBER_MULTIGET_KEYS_READ(29),
NUMBER_MULTIGET_BYTES_READ(30),
// Number of deletes records that were not required to be
// written to storage because key does not exist
NUMBER_FILTERED_DELETES(31),
NUMBER_MERGE_FAILURES(32),
SEQUENCE_NUMBER(33),
// number of times bloom was checked before creating iterator on a
// file, and the number of times the check was useful in avoiding
// iterator creation (and thus likely IOPs).
BLOOM_FILTER_PREFIX_CHECKED(34),
BLOOM_FILTER_PREFIX_USEFUL(35),
// Number of times we had to reseek inside an iteration to skip
// over large number of keys with same userkey.
NUMBER_OF_RESEEKS_IN_ITERATION(36),
// Record the number of calls to GetUpadtesSince. Useful to keep track of
// transaction log iterator refreshes
GET_UPDATES_SINCE_CALLS(37),
BLOCK_CACHE_COMPRESSED_MISS(38), // miss in the compressed block cache
BLOCK_CACHE_COMPRESSED_HIT(39), // hit in the compressed block cache
WAL_FILE_SYNCED(40), // Number of times WAL sync is done
WAL_FILE_BYTES(41), // Number of bytes written to WAL
// Writes can be processed by requesting thread or by the thread at the
// head of the writers queue.
WRITE_DONE_BY_SELF(42),
WRITE_DONE_BY_OTHER(43),
WRITE_WITH_WAL(44), // Number of Write calls that request WAL
COMPACT_READ_BYTES(45), // Bytes read during compaction
COMPACT_WRITE_BYTES(46), // Bytes written during compaction
// Number of table's properties loaded directly from file, without creating
// table reader object.
NUMBER_DIRECT_LOAD_TABLE_PROPERTIES(47),
NUMBER_SUPERVERSION_ACQUIRES(48),
NUMBER_SUPERVERSION_RELEASES(49),
NUMBER_SUPERVERSION_CLEANUPS(50);
private final int value_;
private StatisticsType(int value) {
value_ = value;
}
public int getValue() {
return value_;
}
}

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java/rocksjni/statistics.cc Normal file
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// This file implements the "bridge" between Java and C++ and enables
// calling c++ rocksdb::Statistics methods from Java side.
#include <stdio.h>
#include <stdlib.h>
#include <jni.h>
#include <string>
#include <memory>
#include "include/org_rocksdb_Statistics.h"
#include "rocksjni/portal.h"
#include "rocksdb/statistics.h"
#include "rocksdb/options.h"
/*
* Class: org_rocksdb_Statistics
* Method: getTickerCount0
* Signature: (IJ)J
*/
jlong Java_org_rocksdb_Statistics_getTickerCount0(
JNIEnv* env, jobject jobj, int ticker, jlong handle) {
auto st = reinterpret_cast<rocksdb::Statistics*>(handle);
assert(st != nullptr);
return st->getTickerCount(static_cast<rocksdb::Tickers>(ticker));
}