| /** |
| * 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; |
| } |
| } |
