| /* |
| * 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.plans; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore; |
| import org.apache.pig.impl.plan.DepthFirstWalker; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| /** |
| * An {@link MROpPlanVisitor} that gathers the paths for all |
| * intermediate data from a {@link MROperPlan} |
| */ |
| public class MRIntermediateDataVisitor extends MROpPlanVisitor { |
| private final Set<String> intermediate; |
| |
| public MRIntermediateDataVisitor(MROperPlan plan) { |
| super(plan, new DepthFirstWalker<MapReduceOper, MROperPlan>(plan)); |
| this.intermediate = new HashSet<String>(); |
| } |
| |
| /** |
| * Get all paths for intermediate data. visit() must be called before this. |
| * |
| * @return All intermediate data ElementDescriptors |
| */ |
| public Set<String> getIntermediate() { |
| return intermediate; |
| } |
| |
| class StoreFinder extends PhyPlanVisitor { |
| |
| protected StoreFinder(PhysicalPlan plan) { |
| super(plan, new DepthFirstWalker<PhysicalOperator, PhysicalPlan>( |
| plan)); |
| } |
| |
| @Override |
| public void visitStore(POStore store) { |
| if (store.isTmpStore()) { |
| intermediate.add(store.getSFile().getFileName()); |
| } |
| } |
| } |
| |
| @Override |
| public void visitMROp(MapReduceOper mr) throws VisitorException { |
| if (mr.mapPlan != null && mr.mapPlan.size() > 0) { |
| StoreFinder finder = new StoreFinder(mr.mapPlan); |
| finder.visit(); |
| } |
| if (mr.combinePlan != null && mr.combinePlan.size() > 0) { |
| StoreFinder finder = new StoreFinder(mr.combinePlan); |
| finder.visit(); |
| } |
| if (mr.reducePlan != null && mr.reducePlan.size() > 0) { |
| StoreFinder finder = new StoreFinder(mr.reducePlan); |
| finder.visit(); |
| } |
| } |
| } |