hadoop TaskSpeculationPredicate 源码
haddop TaskSpeculationPredicate 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/speculate/TaskSpeculationPredicate.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.mapreduce.v2.app.speculate;
import org.apache.hadoop.mapreduce.v2.api.records.JobId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.app.AppContext;
import org.apache.hadoop.mapreduce.v2.app.job.Job;
import org.apache.hadoop.mapreduce.v2.app.job.Task;
public class TaskSpeculationPredicate {
boolean canSpeculate(AppContext context, TaskId taskID) {
// This class rejects speculating any task that already has speculations,
// or isn't running.
// Subclasses should call TaskSpeculationPredicate.canSpeculate(...) , but
// can be even more restrictive.
JobId jobID = taskID.getJobId();
Job job = context.getJob(jobID);
Task task = job.getTask(taskID);
return task.getAttempts().size() == 1;
}
}
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