hadoop DFSHedgedReadMetrics 源码
haddop DFSHedgedReadMetrics 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSHedgedReadMetrics.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.hdfs;
import org.apache.hadoop.classification.InterfaceAudience;
import java.util.concurrent.atomic.LongAdder;
/**
* The client-side metrics for hedged read feature.
* This class has a number of metrics variables that are publicly accessible,
* we can grab them from client side, like HBase.
*/
@InterfaceAudience.Private
public class DFSHedgedReadMetrics {
public final LongAdder hedgedReadOps = new LongAdder();
public final LongAdder hedgedReadOpsWin = new LongAdder();
public final LongAdder hedgedReadOpsInCurThread = new LongAdder();
public void incHedgedReadOps() {
hedgedReadOps.increment();
}
public void incHedgedReadOpsInCurThread() {
hedgedReadOpsInCurThread.increment();
}
public void incHedgedReadWins() {
hedgedReadOpsWin.increment();
}
public long getHedgedReadOps() {
return hedgedReadOps.longValue();
}
public long getHedgedReadOpsInCurThread() {
return hedgedReadOpsInCurThread.longValue();
}
public long getHedgedReadWins() {
return hedgedReadOpsWin.longValue();
}
}
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