hadoop StepTracking 源码
haddop StepTracking 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/StepTracking.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.server.namenode.startupprogress;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Internal data structure used to track progress of a {@link Step}.
*/
@InterfaceAudience.Private
final class StepTracking extends AbstractTracking {
AtomicLong count = new AtomicLong();
long total = Long.MIN_VALUE;
@Override
public StepTracking clone() {
StepTracking clone = new StepTracking();
super.copy(clone);
clone.count = new AtomicLong(count.get());
clone.total = total;
return clone;
}
}
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