1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.giraph.utils; 19 20 import java.io.IOException; 21 22 import org.apache.hadoop.mapreduce.JobContext; 23 import org.apache.hadoop.mapreduce.OutputCommitter; 24 import org.apache.hadoop.mapreduce.TaskAttemptContext; 25 26 /** 27 * Output committer which has abstract commit method 28 */ 29 public abstract class DefaultOutputCommitter extends OutputCommitter { 30 /** 31 * For cleaning up the job's output after job completion. Note that this 32 * is invoked for jobs with final run state as 33 * {@link org.apache.hadoop.mapreduce.JobStatus.State#SUCCEEDED} 34 * 35 * @param jobContext Context of the job whose output is being written. 36 */ 37 public abstract void commit(JobContext jobContext) throws IOException; 38 39 @Override 40 public final void setupJob(JobContext jobContext) throws IOException { 41 } 42 43 @Override 44 public final void setupTask(TaskAttemptContext taskContext) 45 throws IOException { 46 } 47 48 @Override 49 public final void commitJob(JobContext jobContext) 50 throws IOException { 51 super.commitJob(jobContext); 52 commit(jobContext); 53 } 54 55 @Override 56 public final boolean needsTaskCommit(TaskAttemptContext taskContext) 57 throws IOException { 58 // Digraph does not require a task commit and there is a bug in Corona 59 // which triggers t5688706 60 // Avoiding the task commit should work around this. 61 return false; 62 } 63 64 @Override 65 public final void commitTask(TaskAttemptContext context) throws IOException { 66 } 67 68 @Override 69 public final void abortTask(TaskAttemptContext taskContext) 70 throws IOException { 71 } 72 }