JvmTask.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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.io.Writable;
- 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);
- }
- }
- }