| /* |
| * 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 org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROperPlan; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROpPlanVisitor; |
| import org.apache.pig.backend.hadoop.executionengine.util.CombinerOptimizerUtil; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.impl.plan.CompilationMessageCollector; |
| import org.apache.pig.impl.plan.DepthFirstWalker; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| /** |
| * Optimize map reduce plans to use the combiner where possible. |
| */ |
| public class CombinerOptimizer extends MROpPlanVisitor { |
| private CompilationMessageCollector messageCollector = null; |
| private boolean doMapAgg; |
| |
| public CombinerOptimizer(MROperPlan plan, boolean doMapAgg) { |
| this(plan, doMapAgg, new CompilationMessageCollector()); |
| } |
| |
| public CombinerOptimizer(MROperPlan plan, boolean doMapAgg, |
| CompilationMessageCollector messageCollector) { |
| super(plan, new DepthFirstWalker<MapReduceOper, MROperPlan>(plan)); |
| this.messageCollector = messageCollector; |
| this.doMapAgg = doMapAgg; |
| } |
| |
| public CompilationMessageCollector getMessageCollector() { |
| return messageCollector; |
| } |
| |
| @Override |
| public void visitMROp(MapReduceOper mr) throws VisitorException { |
| CombinerOptimizerUtil.addCombiner(mr.mapPlan, mr.reducePlan, mr.combinePlan, messageCollector, doMapAgg); |
| } |
| } |