hadoop MapTaskCompletionEventsUpdate 源码
haddop MapTaskCompletionEventsUpdate 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTaskCompletionEventsUpdate.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.mapred;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.Writable;
/**
* A class that represents the communication between the tasktracker and child
* tasks w.r.t the map task completion events. It also indicates whether the
* child task should reset its events index.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class MapTaskCompletionEventsUpdate implements Writable {
TaskCompletionEvent[] events;
boolean reset;
public MapTaskCompletionEventsUpdate() { }
public MapTaskCompletionEventsUpdate(TaskCompletionEvent[] events,
boolean reset) {
this.events = events;
this.reset = reset;
}
public boolean shouldReset() {
return reset;
}
public TaskCompletionEvent[] getMapTaskCompletionEvents() {
return events;
}
public void write(DataOutput out) throws IOException {
out.writeBoolean(reset);
out.writeInt(events.length);
for (TaskCompletionEvent event : events) {
event.write(out);
}
}
public void readFields(DataInput in) throws IOException {
reset = in.readBoolean();
events = new TaskCompletionEvent[in.readInt()];
for (int i = 0; i < events.length; ++i) {
events[i] = new TaskCompletionEvent();
events[i].readFields(in);
}
}
}
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