/**
* 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.tez.mapreduce.input;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.apache.tez.common.TezUtils;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.api.InputContext;
import org.apache.tez.runtime.library.common.localshuffle.LocalShuffle;
import org.apache.tez.runtime.library.input.OrderedGroupedInputLegacy;
/**
* <code>LocalMergedInput</code> in an {@link LogicalInput} which shuffles intermediate
* sorted data, merges them and provides key/<values> to the consumer.
*/
public class LocalMergedInput extends OrderedGroupedInputLegacy {
public LocalMergedInput(InputContext inputContext, int numPhysicalInputs) {
super(inputContext, numPhysicalInputs);
}
@Override
public List<Event> initialize() throws IOException {
getContext().requestInitialMemory(0l, null); // mandatory call.
getContext().inputIsReady();
this.conf = TezUtils.createConfFromUserPayload(getContext().getUserPayload());
if (getNumPhysicalInputs() == 0) {
return Collections.emptyList();
}
LocalShuffle localShuffle = new LocalShuffle(getContext(), conf, getNumPhysicalInputs());
rawIter = localShuffle.run();
createValuesIterator();
return Collections.emptyList();
}
@Override
public void start() throws IOException {
}
@Override
public List<Event> close() throws IOException {
if (getNumPhysicalInputs() != 0) {
rawIter.close();
}
return Collections.emptyList();
}
}