hadoop JvmTask 源码
haddop JvmTask 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JvmTask.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;
/**
* Task abstraction that can be serialized, implements the writable interface.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class JvmTask implements Writable {
Task t;
boolean shouldDie;
public JvmTask(Task t, boolean shouldDie) {
this.t = t;
this.shouldDie = shouldDie;
}
public JvmTask() {}
public Task getTask() {
return t;
}
public boolean shouldDie() {
return shouldDie;
}
public void write(DataOutput out) throws IOException {
out.writeBoolean(shouldDie);
if (t != null) {
out.writeBoolean(true);
out.writeBoolean(t.isMapTask());
t.write(out);
} else {
out.writeBoolean(false);
}
}
public void readFields(DataInput in) throws IOException {
shouldDie = in.readBoolean();
boolean taskComing = in.readBoolean();
if (taskComing) {
boolean isMap = in.readBoolean();
if (isMap) {
t = new MapTask();
} else {
t = new ReduceTask();
}
t.readFields(in);
}
}
}
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