/*
* 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.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.io.PrintStream;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceOper;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PlanPrinter;
import org.apache.pig.impl.plan.DepthFirstWalker;
import org.apache.pig.impl.plan.VisitorException;
/**
* A visitor mechanism printing out the logical plan.
*/
public class MRPrinter extends MROpPlanVisitor {
private PrintStream mStream = null;
private int mIndent = 0;
/**
* @param ps PrintStream to output plan information to
* @param plan MR plan to print
*/
public MRPrinter(PrintStream ps, MROperPlan plan) {
super(plan, new DepthFirstWalker<MapReduceOper, MROperPlan>(plan));
mStream = ps;
mStream.println("--------------------------------------------------");
mStream.println("| Map Reduce Plan |");
mStream.println("--------------------------------------------------");
}
@Override
public void visitMROp(MapReduceOper mr) throws VisitorException {
mStream.println("MapReduce node " + mr.getOperatorKey().toString());
if (mr.mapPlan != null && mr.mapPlan.size() > 0) {
mStream.println("Map Plan");
PlanPrinter printer = new PlanPrinter(mr.mapPlan, mStream);
printer.visit();
mStream.println("--------");
}
if (mr.combinePlan != null && mr.combinePlan.size() > 0) {
mStream.println("Combine Plan");
PlanPrinter printer = new PlanPrinter(mr.combinePlan, mStream);
printer.visit();
mStream.println("--------");
}
if (mr.reducePlan != null && mr.reducePlan.size() > 0) {
mStream.println("Reduce Plan");
PlanPrinter printer = new PlanPrinter(mr.reducePlan, mStream);
printer.visit();
mStream.println("--------");
}
mStream.println("Global sort: " + mr.isGlobalSort());
if (mr.getQuantFile() != null) {
mStream.println("Quantile file: " + mr.getQuantFile());
}
mStream.println("----------------");
}
}