| /* |
| * 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.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROpPlanVisitor; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROperPlan; |
| import org.apache.pig.backend.hadoop.executionengine.optimizer.SecondaryKeyOptimizer; |
| import org.apache.pig.backend.hadoop.executionengine.util.SecondaryKeyOptimizerUtil; |
| import org.apache.pig.backend.hadoop.executionengine.util.SecondaryKeyOptimizerUtil.SecondaryKeyOptimizerInfo; |
| import org.apache.pig.classification.InterfaceAudience; |
| import org.apache.pig.impl.plan.DepthFirstWalker; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| @InterfaceAudience.Private |
| public class SecondaryKeyOptimizerMR extends MROpPlanVisitor implements SecondaryKeyOptimizer { |
| private static Log log = LogFactory.getLog(SecondaryKeyOptimizerMR.class); |
| private SecondaryKeyOptimizerInfo info; |
| |
| /** |
| * @param plan |
| * The MROperPlan to visit to discover keyType |
| */ |
| public SecondaryKeyOptimizerMR(MROperPlan plan) { |
| super(plan, new DepthFirstWalker<MapReduceOper, MROperPlan>(plan)); |
| } |
| |
| |
| @Override |
| public void visitMROp(MapReduceOper mr) throws VisitorException { |
| // Only optimize for Cogroup case |
| if (mr.isGlobalSort()) |
| return; |
| |
| // Don't optimize when we already have a custom partitioner |
| if (mr.getCustomPartitioner()!=null) |
| return; |
| |
| SecondaryKeyOptimizerUtil secondaryKeyOptUtil = new SecondaryKeyOptimizerUtil(); |
| info = secondaryKeyOptUtil.applySecondaryKeySort(mr.mapPlan, mr.reducePlan); |
| if (info != null && info.isUseSecondaryKey()) { |
| mr.setUseSecondaryKey(true); |
| mr.setSecondarySortOrder(info.getSecondarySortOrder()); |
| log.info("Using Secondary Key Optimization for MapReduce node " + mr.getOperatorKey()); |
| } |
| } |
| |
| |
| @Override |
| public int getNumSortRemoved() { |
| return (info == null) ? 0 : info.getNumSortRemoved(); |
| } |
| |
| @Override |
| public int getNumDistinctChanged() { |
| return (info == null) ? 0 : info.getNumDistinctChanged(); |
| } |
| |
| @Override |
| public int getNumUseSecondaryKey() { |
| return (info == null) ? 0 : info.getNumUseSecondaryKey(); |
| } |
| |
| } |