001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.mapreduce.lib.output;
019
020import java.io.IOException;
021
022import org.apache.hadoop.classification.InterfaceAudience;
023import org.apache.hadoop.classification.InterfaceStability;
024import org.apache.hadoop.mapreduce.TaskAttemptContext;
025
026/**
027 * Interface for an {@link org.apache.hadoop.mapreduce.OutputCommitter}
028 * implementing partial commit of task output, as during preemption.
029 */
030@InterfaceAudience.Public
031@InterfaceStability.Evolving
032public interface PartialOutputCommitter {
033
034  /**
035   * Remove all previously committed outputs from prior executions of this task.
036   * @param context Context for cleaning up previously promoted output.
037   * @throws IOException If cleanup fails, then the state of the task my not be
038   *                     well defined.
039   */
040  public void cleanUpPartialOutputForTask(TaskAttemptContext context)
041    throws IOException;
042
043}