/*
* 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.pig.backend.hadoop.executionengine.mapReduceLayer;
import java.io.IOException;
import org.apache.pig.data.Tuple;
/**
* This class is the static Mapper class used by Pig
* to execute Pig map only jobs. It gets a TargetedTuple
* as input to the map function. Using the targets in it,
* attaches the tuple as input to the target operators.
*
* The map plan is then executed. The result is then collected
* into the output collector provide by Hadoop which is configured
* to write to the store file.
*
* There is a reporter running in a separate thread that keeps
* reporting progress to let the job tracker know that we are
* alive. The sleep time for the reporter thread can be configured
* per job via the "pig.reporter.sleep.time". By default it uses
* a 10 sec sleep time
*/
public class PigMapOnly {
public static class Map extends PigMapBase {
@Override
public void collect(Context oc, Tuple tuple)
throws InterruptedException, IOException {
oc.write(null, tuple);
}
}
}