hadoop InstrumentedWriteLock 源码
haddop InstrumentedWriteLock 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/InstrumentedWriteLock.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.util;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.classification.VisibleForTesting;
import org.slf4j.Logger;
/**
* This is a wrap class of a <tt>WriteLock</tt>.
* It extends the class {@link InstrumentedLock}, and can be used to track
* whether a specific write lock is being held for too long and log
* warnings if so.
*
* The logged warnings are throttled so that logs are not spammed.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class InstrumentedWriteLock extends InstrumentedLock {
private final ReentrantReadWriteLock readWriteLock;
private volatile long writeLockHeldTimeStamp = 0;
public InstrumentedWriteLock(String name, Logger logger,
ReentrantReadWriteLock readWriteLock,
long minLoggingGapMs, long lockWarningThresholdMs) {
this(name, logger, readWriteLock, minLoggingGapMs, lockWarningThresholdMs,
new Timer());
}
@VisibleForTesting
InstrumentedWriteLock(String name, Logger logger,
ReentrantReadWriteLock readWriteLock,
long minLoggingGapMs, long lockWarningThresholdMs, Timer clock) {
super(name, logger, readWriteLock.writeLock(), minLoggingGapMs,
lockWarningThresholdMs, clock);
this.readWriteLock = readWriteLock;
}
@Override
public void unlock() {
boolean needReport = readWriteLock.getWriteHoldCount() == 1;
long localWriteReleaseTime = getTimer().monotonicNow();
long localWriteAcquireTime = writeLockHeldTimeStamp;
getLock().unlock();
if (needReport) {
writeLockHeldTimeStamp = 0;
check(localWriteAcquireTime, localWriteReleaseTime, true);
}
}
/**
* Starts timing for the instrumented write lock.
*/
@Override
protected void startLockTiming() {
if (readWriteLock.getWriteHoldCount() == 1) {
writeLockHeldTimeStamp = getTimer().monotonicNow();
}
}
}
相关信息
相关文章
hadoop ApplicationClassLoader 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦