| /** |
| * 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.engine.common.combine; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.tez.common.TezJobConfig; |
| import org.apache.tez.engine.common.sort.impl.IFile.Writer; |
| import org.apache.tez.engine.common.sort.impl.TezRawKeyValueIterator; |
| |
| /** |
| *<b>Combiner Initialization</b></p> The Combiner class is picked up |
| * using the TEZ_ENGINE_COMBINER_CLASS attribute in {@link TezJobConfig} |
| * |
| * |
| * Partitioners need to provide a single argument ({@link TezTaskContext}) |
| * constructor. |
| */ |
| @Unstable |
| @LimitedPrivate("mapreduce") |
| public interface Combiner { |
| public void combine(TezRawKeyValueIterator rawIter, Writer writer) |
| throws InterruptedException, IOException; |
| } |