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/**
* 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.*;
import org.apache.hadoop.mapred.TaskTracker.TaskInProgress;
/** Runs a map task. */
class MapTaskRunner extends TaskRunner {
public MapTaskRunner(TaskInProgress task, TaskTracker tracker, JobConf conf) {
super(task, tracker, conf);
}
/** Delete any temporary files from previous failed attempts. */
public boolean prepare() throws IOException {
if (!super.prepare()) {
return false;
}
mapOutputFile.removeAll(getTask().getTaskID());
return true;
}
/** Delete all of the temporary map output files. */
public void close() throws IOException {
LOG.info(getTask()+" done; removing files.");
mapOutputFile.removeAll(getTask().getTaskID());
}
}