/*
* 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.fetch;
import java.io.IOException;
import java.io.PrintStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.pig.PigException;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.datastorage.ConfigurationUtil;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRConfiguration;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigHadoopLogger;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.UDFFinishVisitor;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStream;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.util.PlanHelper;
import org.apache.pig.backend.hadoop.executionengine.shims.HadoopShims;
import org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil;
import org.apache.pig.data.SchemaTupleBackend;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.PigImplConstants;
import org.apache.pig.impl.plan.DependencyOrderWalker;
import org.apache.pig.impl.plan.PlanException;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.pig.impl.util.UDFContext;
import org.apache.pig.impl.util.Utils;
import org.apache.pig.tools.pigstats.EmptyPigStats;
import org.apache.pig.tools.pigstats.PigStats;
import org.apache.pig.tools.pigstats.PigStatusReporter;
/**
* This class is responsible for executing the fetch task, saving the result to disk
* and do the necessary cleanup afterwards.
*
*/
public class FetchLauncher {
private final PigContext pigContext;
private final Configuration conf;
public FetchLauncher(PigContext pigContext) {
this.pigContext = pigContext;
this.conf = ConfigurationUtil.toConfiguration(pigContext.getProperties());
}
/**
* Runs the fetch task by executing chain of calls on the PhysicalPlan from the leaf
* up to the LoadFunc
*
* @param pp - Physical plan
* @return SimpleFetchPigStats instance representing the fetched result
* @throws IOException
*/
public PigStats launchPig(PhysicalPlan pp) throws IOException {
try {
POStore poStore = (POStore) pp.getLeaves().get(0);
init(pp, poStore);
// run fetch
runPipeline(poStore);
UDFFinishVisitor udfFinisher = new UDFFinishVisitor(pp,
new DependencyOrderWalker<PhysicalOperator, PhysicalPlan>(pp));
udfFinisher.visit();
return PigStats.start(new EmptyPigStats(pigContext, poStore));
}
finally {
UDFContext.getUDFContext().addJobConf(null);
pigContext.getProperties().remove(PigImplConstants.CONVERTED_TO_FETCH);
}
}
/**
* Creates an empty MR plan
*
* @param pp - Physical plan
* @param pc - PigContext
* @param ps - PrintStream to write the plan to
* @param format format of the output plan
* @throws PlanException
* @throws VisitorException
* @throws IOException
*/
public void explain(PhysicalPlan pp, PigContext pc, PrintStream ps, String format)
throws PlanException, VisitorException, IOException {
if ("xml".equals(format)) {
ps.println("<mapReducePlan>No MR jobs. Fetch only</mapReducePlan>");
}
else {
ps.println("#--------------------------------------------------");
ps.println("# Map Reduce Plan ");
ps.println("#--------------------------------------------------");
ps.println("No MR jobs. Fetch only.");
}
return;
}
private void init(PhysicalPlan pp, POStore poStore) throws IOException {
poStore.setStoreImpl(new FetchPOStoreImpl(pigContext));
poStore.setUp();
TaskAttemptID taskAttemptID = HadoopShims.getNewTaskAttemptID();
//Fetch mode needs to explicitly set the task id which is otherwise done by Hadoop
conf.setInt(MRConfiguration.JOB_APPLICATION_ATTEMPT_ID, taskAttemptID.getId());
if (!PlanHelper.getPhysicalOperators(pp, POStream.class).isEmpty()) {
MapRedUtil.setupStreamingDirsConfSingle(poStore, pigContext, conf);
}
String currentTime = Long.toString(System.currentTimeMillis());
conf.set("pig.script.submitted.timestamp", currentTime);
conf.set("pig.job.submitted.timestamp", currentTime);
PhysicalOperator.setReporter(new FetchProgressableReporter());
SchemaTupleBackend.initialize(conf, pigContext);
UDFContext udfContext = UDFContext.getUDFContext();
udfContext.addJobConf(conf);
udfContext.setClientSystemProps(pigContext.getProperties());
udfContext.serialize(conf);
PigMapReduce.sJobConfInternal.set(conf);
Utils.setDefaultTimeZone(conf);
boolean aggregateWarning = "true".equalsIgnoreCase(conf.get("aggregate.warning"));
PigStatusReporter pigStatusReporter = PigStatusReporter.getInstance();
pigStatusReporter.setContext(new FetchTaskContext(new FetchContext()));
PigHadoopLogger pigHadoopLogger = PigHadoopLogger.getInstance();
pigHadoopLogger.setReporter(pigStatusReporter);
pigHadoopLogger.setAggregate(aggregateWarning);
PhysicalOperator.setPigLogger(pigHadoopLogger);
}
private void runPipeline(POStore posStore) throws IOException {
while (true) {
Result res = posStore.getNextTuple();
if (res.returnStatus == POStatus.STATUS_OK)
continue;
if (res.returnStatus == POStatus.STATUS_EOP) {
posStore.tearDown();
return;
}
if (res.returnStatus == POStatus.STATUS_NULL)
continue;
if(res.returnStatus==POStatus.STATUS_ERR){
String errMsg;
if(res.result != null) {
errMsg = "Fetch failed. Couldn't retrieve result: " + res.result;
} else {
errMsg = "Fetch failed. Couldn't retrieve result";
}
int errCode = 2088;
ExecException ee = new ExecException(errMsg, errCode, PigException.BUG);
throw ee;
}
}
}
}