/*
* 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 java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.Counters;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobID;
import org.apache.hadoop.mapred.RunningJob;
import org.apache.hadoop.mapred.jobcontrol.Job;
import org.apache.hadoop.mapred.jobcontrol.JobControl;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.pig.ExecType;
import org.apache.pig.PigException;
import org.apache.pig.PigWarning;
import org.apache.pig.PigRunner.ReturnCode;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.datastorage.ConfigurationUtil;
import org.apache.pig.backend.hadoop.executionengine.HExecutionEngine;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRCompiler.LastInputStreamingOptimizer;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.DotMRPrinter;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.EndOfAllInputSetter;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROperPlan;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MRPrinter;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.POPackageAnnotator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POJoinPackage;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore;
import org.apache.pig.backend.hadoop.executionengine.shims.HadoopShims;
import org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileSpec;
import org.apache.pig.impl.plan.CompilationMessageCollector;
import org.apache.pig.impl.plan.PlanException;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.pig.impl.plan.CompilationMessageCollector.MessageType;
import org.apache.pig.impl.util.ConfigurationValidator;
import org.apache.pig.impl.util.LogUtils;
import org.apache.pig.impl.util.Utils;
import org.apache.pig.tools.pigstats.PigStats;
import org.apache.pig.tools.pigstats.PigStatsUtil;
import org.apache.pig.tools.pigstats.ScriptState;
/**
* Main class that launches pig for Map Reduce
*
*/
public class MapReduceLauncher extends Launcher{
private static final Log log = LogFactory.getLog(MapReduceLauncher.class);
//used to track the exception thrown by the job control which is run in a separate thread
private Exception jobControlException = null;
private String jobControlExceptionStackTrace = null;
private boolean aggregateWarning = false;
private Map<FileSpec, Exception> failureMap;
public static final String SUCCEEDED_FILE_NAME = "_SUCCESS";
public static final String SUCCESSFUL_JOB_OUTPUT_DIR_MARKER =
"mapreduce.fileoutputcommitter.marksuccessfuljobs";
/**
* Get the exception that caused a failure on the backend for a
* store location (if any).
*/
public Exception getError(FileSpec spec) {
return failureMap.get(spec);
}
@Override
public void reset() {
failureMap = new HashMap<FileSpec, Exception>();
super.reset();
}
@SuppressWarnings("deprecation")
@Override
public PigStats launchPig(PhysicalPlan php,
String grpName,
PigContext pc) throws PlanException,
VisitorException,
IOException,
ExecException,
JobCreationException,
Exception {
long sleepTime = 500;
aggregateWarning = "true".equalsIgnoreCase(pc.getProperties().getProperty("aggregate.warning"));
MROperPlan mrp = compile(php, pc);
ConfigurationValidator.validatePigProperties(pc.getProperties());
Configuration conf = ConfigurationUtil.toConfiguration(pc.getProperties());
HExecutionEngine exe = pc.getExecutionEngine();
JobClient jobClient = new JobClient(exe.getJobConf());
JobControlCompiler jcc = new JobControlCompiler(pc, conf);
// start collecting statistics
PigStatsUtil.startCollection(pc, jobClient, jcc, mrp);
List<Job> failedJobs = new LinkedList<Job>();
List<NativeMapReduceOper> failedNativeMR = new LinkedList<NativeMapReduceOper>();
List<Job> completeFailedJobsInThisRun = new LinkedList<Job>();
List<Job> succJobs = new LinkedList<Job>();
JobControl jc;
int totalMRJobs = mrp.size();
int numMRJobsCompl = 0;
double lastProg = -1;
//create the exception handler for the job control thread
//and register the handler with the job control thread
JobControlThreadExceptionHandler jctExceptionHandler = new JobControlThreadExceptionHandler();
boolean stop_on_failure =
pc.getProperties().getProperty("stop.on.failure", "false").equals("true");
// jc is null only when mrp.size == 0
while(mrp.size() != 0) {
jc = jcc.compile(mrp, grpName);
if(jc == null) {
List<MapReduceOper> roots = new LinkedList<MapReduceOper>();
roots.addAll(mrp.getRoots());
// run the native mapreduce roots first then run the rest of the roots
for(MapReduceOper mro: roots) {
if(mro instanceof NativeMapReduceOper) {
NativeMapReduceOper natOp = (NativeMapReduceOper)mro;
try {
ScriptState.get().emitJobsSubmittedNotification(1);
natOp.runJob();
numMRJobsCompl++;
} catch (IOException e) {
mrp.trimBelow(natOp);
failedNativeMR.add(natOp);
String msg = "Error running native mapreduce" +
" operator job :" + natOp.getJobId() + e.getMessage();
String stackTrace = getStackStraceStr(e);
LogUtils.writeLog(msg,
stackTrace,
pc.getProperties().getProperty("pig.logfile"),
log
);
log.info(msg);
if (stop_on_failure) {
int errCode = 6017;
throw new ExecException(msg, errCode,
PigException.REMOTE_ENVIRONMENT);
}
}
double prog = ((double)numMRJobsCompl)/totalMRJobs;
notifyProgress(prog, lastProg);
lastProg = prog;
mrp.remove(natOp);
}
}
continue;
}
// Initially, all jobs are in wait state.
List<Job> jobsWithoutIds = jc.getWaitingJobs();
log.info(jobsWithoutIds.size() +" map-reduce job(s) waiting for submission.");
//notify listeners about jobs submitted
ScriptState.get().emitJobsSubmittedNotification(jobsWithoutIds.size());
// update Pig stats' job DAG with just compiled jobs
PigStatsUtil.updateJobMroMap(jcc.getJobMroMap());
// determine job tracker url
String jobTrackerLoc;
JobConf jobConf = jobsWithoutIds.get(0).getJobConf();
try {
String port = jobConf.get("mapred.job.tracker.http.address");
String jobTrackerAdd = jobConf.get(HExecutionEngine.JOB_TRACKER_LOCATION);
jobTrackerLoc = jobTrackerAdd.substring(0,jobTrackerAdd.indexOf(":"))
+ port.substring(port.indexOf(":"));
}
catch(Exception e){
// Could not get the job tracker location, most probably we are running in local mode.
// If it is the case, we don't print out job tracker location,
// because it is meaningless for local mode.
jobTrackerLoc = null;
log.debug("Failed to get job tracker location.");
}
completeFailedJobsInThisRun.clear();
Thread jcThread = new Thread(jc);
jcThread.setUncaughtExceptionHandler(jctExceptionHandler);
jcThread.setContextClassLoader(PigContext.getClassLoader());
//All the setup done, now lets launch the jobs.
jcThread.start();
// Now wait, till we are finished.
while(!jc.allFinished()){
try { Thread.sleep(sleepTime); }
catch (InterruptedException e) {}
List<Job> jobsAssignedIdInThisRun = new ArrayList<Job>();
for(Job job : jobsWithoutIds){
if (job.getAssignedJobID() != null){
jobsAssignedIdInThisRun.add(job);
log.info("HadoopJobId: "+job.getAssignedJobID());
if(jobTrackerLoc != null){
log.info("More information at: http://"+ jobTrackerLoc+
"/jobdetails.jsp?jobid="+job.getAssignedJobID());
}
ScriptState.get().emitJobStartedNotification(
job.getAssignedJobID().toString());
}
else{
// This job is not assigned an id yet.
}
}
jobsWithoutIds.removeAll(jobsAssignedIdInThisRun);
double prog = (numMRJobsCompl+calculateProgress(jc, jobClient))/totalMRJobs;
notifyProgress(prog, lastProg);
lastProg = prog;
// collect job stats by frequently polling of completed jobs (PIG-1829)
PigStatsUtil.accumulateStats(jc);
}
//check for the jobControlException first
//if the job controller fails before launching the jobs then there are
//no jobs to check for failure
if (jobControlException != null) {
if (jobControlException instanceof PigException) {
if (jobControlExceptionStackTrace != null) {
LogUtils.writeLog("Error message from job controller",
jobControlExceptionStackTrace, pc
.getProperties().getProperty(
"pig.logfile"), log);
}
throw jobControlException;
} else {
int errCode = 2117;
String msg = "Unexpected error when launching map reduce job.";
throw new ExecException(msg, errCode, PigException.BUG,
jobControlException);
}
}
if (!jc.getFailedJobs().isEmpty() ) {
if (stop_on_failure){
int errCode = 6017;
StringBuilder msg = new StringBuilder();
for (int i=0; i<jc.getFailedJobs().size(); i++) {
Job j = jc.getFailedJobs().get(i);
msg.append(getFirstLineFromMessage(j.getMessage()));
if (i!=jc.getFailedJobs().size()-1) {
msg.append("\n");
}
}
throw new ExecException(msg.toString(), errCode,
PigException.REMOTE_ENVIRONMENT);
}
// If we only have one store and that job fail, then we sure
// that the job completely fail, and we shall stop dependent jobs
for (Job job : jc.getFailedJobs()) {
completeFailedJobsInThisRun.add(job);
log.info("job " + job.getAssignedJobID() + " has failed! Stop running all dependent jobs");
}
failedJobs.addAll(jc.getFailedJobs());
}
int removedMROp = jcc.updateMROpPlan(completeFailedJobsInThisRun);
numMRJobsCompl += removedMROp;
List<Job> jobs = jc.getSuccessfulJobs();
jcc.moveResults(jobs);
succJobs.addAll(jobs);
// collecting final statistics
PigStatsUtil.accumulateStats(jc);
jc.stop();
}
ScriptState.get().emitProgressUpdatedNotification(100);
log.info( "100% complete");
boolean failed = false;
if(failedNativeMR.size() > 0){
failed = true;
}
// Look to see if any jobs failed. If so, we need to report that.
if (failedJobs != null && failedJobs.size() > 0) {
Exception backendException = null;
for (Job fj : failedJobs) {
try {
getStats(fj, jobClient, true, pc);
} catch (Exception e) {
backendException = e;
}
List<POStore> sts = jcc.getStores(fj);
for (POStore st: sts) {
failureMap.put(st.getSFile(), backendException);
}
PigStatsUtil.setBackendException(fj, backendException);
}
failed = true;
}
// stats collection is done, log the results
PigStatsUtil.stopCollection(true);
// PigStatsUtil.stopCollection also computes the return code based on
// total jobs to run, jobs successful and jobs failed
failed = failed || !PigStats.get().isSuccessful();
Map<Enum, Long> warningAggMap = new HashMap<Enum, Long>();
if (succJobs != null) {
for (Job job : succJobs) {
List<POStore> sts = jcc.getStores(job);
for (POStore st : sts) {
if (pc.getExecType() == ExecType.LOCAL) {
HadoopShims.storeSchemaForLocal(job, st);
}
if (!st.isTmpStore()) {
// create an "_SUCCESS" file in output location if
// output location is a filesystem dir
createSuccessFile(job, st);
} else {
log.debug("Successfully stored result in: \""
+ st.getSFile().getFileName() + "\"");
}
}
getStats(job, jobClient, false, pc);
if (aggregateWarning) {
computeWarningAggregate(job, jobClient, warningAggMap);
}
}
}
if(aggregateWarning) {
CompilationMessageCollector.logAggregate(warningAggMap, MessageType.Warning, log) ;
}
if (!failed) {
log.info("Success!");
} else {
if (succJobs != null && succJobs.size() > 0) {
log.info("Some jobs have failed! Stop running all dependent jobs");
} else {
log.info("Failed!");
}
}
jcc.reset();
int ret = failed ? ((succJobs != null && succJobs.size() > 0)
? ReturnCode.PARTIAL_FAILURE
: ReturnCode.FAILURE)
: ReturnCode.SUCCESS;
return PigStatsUtil.getPigStats(ret);
}
private String getStackStraceStr(Throwable e) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
e.printStackTrace(ps);
return baos.toString();
}
/**
* Log the progress and notify listeners if there is sufficient progress
* @param prog current progress
* @param lastProg progress last time
*/
private void notifyProgress(double prog, double lastProg) {
if(prog>=(lastProg+0.01)){
int perCom = (int)(prog * 100);
if(perCom!=100) {
log.info( perCom + "% complete");
ScriptState.get().emitProgressUpdatedNotification(perCom);
}
}
}
@Override
public void explain(
PhysicalPlan php,
PigContext pc,
PrintStream ps,
String format,
boolean verbose) throws PlanException, VisitorException,
IOException {
log.trace("Entering MapReduceLauncher.explain");
MROperPlan mrp = compile(php, pc);
if (format.equals("text")) {
MRPrinter printer = new MRPrinter(ps, mrp);
printer.setVerbose(verbose);
printer.visit();
} else {
ps.println("#--------------------------------------------------");
ps.println("# Map Reduce Plan ");
ps.println("#--------------------------------------------------");
DotMRPrinter printer =new DotMRPrinter(mrp, ps);
printer.setVerbose(verbose);
printer.dump();
ps.println("");
}
}
public MROperPlan compile(
PhysicalPlan php,
PigContext pc) throws PlanException, IOException, VisitorException {
MRCompiler comp = new MRCompiler(php, pc);
comp.randomizeFileLocalizer();
comp.compile();
comp.aggregateScalarsFiles();
MROperPlan plan = comp.getMRPlan();
//display the warning message(s) from the MRCompiler
comp.getMessageCollector().logMessages(MessageType.Warning, aggregateWarning, log);
String lastInputChunkSize =
pc.getProperties().getProperty(
"last.input.chunksize", POJoinPackage.DEFAULT_CHUNK_SIZE);
//String prop = System.getProperty("pig.exec.nocombiner");
String prop = pc.getProperties().getProperty("pig.exec.nocombiner");
if (!pc.inIllustrator && !("true".equals(prop))) {
CombinerOptimizer co = new CombinerOptimizer(plan, lastInputChunkSize);
co.visit();
//display the warning message(s) from the CombinerOptimizer
co.getMessageCollector().logMessages(MessageType.Warning, aggregateWarning, log);
}
// Optimize the jobs that have a load/store only first MR job followed
// by a sample job.
SampleOptimizer so = new SampleOptimizer(plan, pc);
so.visit();
LimitAdjuster la = new LimitAdjuster(plan, pc);
la.visit();
la.adjust();
// Optimize to use secondary sort key if possible
prop = pc.getProperties().getProperty("pig.exec.nosecondarykey");
if (!pc.inIllustrator && !("true".equals(prop))) {
SecondaryKeyOptimizer skOptimizer = new SecondaryKeyOptimizer(plan);
skOptimizer.visit();
}
// optimize key - value handling in package
POPackageAnnotator pkgAnnotator = new POPackageAnnotator(plan);
pkgAnnotator.visit();
// optimize joins
LastInputStreamingOptimizer liso =
new MRCompiler.LastInputStreamingOptimizer(plan, lastInputChunkSize);
liso.visit();
// figure out the type of the key for the map plan
// this is needed when the key is null to create
// an appropriate NullableXXXWritable object
KeyTypeDiscoveryVisitor kdv = new KeyTypeDiscoveryVisitor(plan);
kdv.visit();
// removes the filter(constant(true)) operators introduced by
// splits.
NoopFilterRemover fRem = new NoopFilterRemover(plan);
fRem.visit();
boolean isMultiQuery =
"true".equalsIgnoreCase(pc.getProperties().getProperty("opt.multiquery","true"));
if (isMultiQuery) {
// reduces the number of MROpers in the MR plan generated
// by multi-query (multi-store) script.
MultiQueryOptimizer mqOptimizer = new MultiQueryOptimizer(plan, pc.inIllustrator);
mqOptimizer.visit();
}
// removes unnecessary stores (as can happen with splits in
// some cases.). This has to run after the MultiQuery and
// NoopFilterRemover.
NoopStoreRemover sRem = new NoopStoreRemover(plan);
sRem.visit();
// check whether stream operator is present
// after MultiQueryOptimizer because it can shift streams from
// map to reduce, etc.
EndOfAllInputSetter checker = new EndOfAllInputSetter(plan);
checker.visit();
boolean isAccum =
"true".equalsIgnoreCase(pc.getProperties().getProperty("opt.accumulator","true"));
if (isAccum) {
AccumulatorOptimizer accum = new AccumulatorOptimizer(plan);
accum.visit();
}
return plan;
}
private boolean shouldMarkOutputDir(Job job) {
return job.getJobConf().getBoolean(SUCCESSFUL_JOB_OUTPUT_DIR_MARKER,
false);
}
private void createSuccessFile(Job job, POStore store) throws IOException {
if(shouldMarkOutputDir(job)) {
Path outputPath = new Path(store.getSFile().getFileName());
FileSystem fs = outputPath.getFileSystem(job.getJobConf());
if(fs.exists(outputPath)){
// create a file in the folder to mark it
Path filePath = new Path(outputPath, SUCCEEDED_FILE_NAME);
if(!fs.exists(filePath)) {
fs.create(filePath).close();
}
}
}
}
/**
* An exception handler class to handle exceptions thrown by the job controller thread
* Its a local class. This is the only mechanism to catch unhandled thread exceptions
* Unhandled exceptions in threads are handled by the VM if the handler is not registered
* explicitly or if the default handler is null
*/
class JobControlThreadExceptionHandler implements Thread.UncaughtExceptionHandler {
public void uncaughtException(Thread thread, Throwable throwable) {
jobControlExceptionStackTrace = getStackStraceStr(throwable);
try {
jobControlException = getExceptionFromString(jobControlExceptionStackTrace);
} catch (Exception e) {
String errMsg = "Could not resolve error that occured when launching map reduce job: "
+ getFirstLineFromMessage(jobControlExceptionStackTrace);
jobControlException = new RuntimeException(errMsg);
}
}
}
@SuppressWarnings("deprecation")
void computeWarningAggregate(Job job, JobClient jobClient, Map<Enum, Long> aggMap) {
JobID mapRedJobID = job.getAssignedJobID();
RunningJob runningJob = null;
try {
runningJob = jobClient.getJob(mapRedJobID);
if(runningJob != null) {
Counters counters = runningJob.getCounters();
if (counters==null)
{
long nullCounterCount = aggMap.get(PigWarning.NULL_COUNTER_COUNT)==null?0 : aggMap.get(PigWarning.NULL_COUNTER_COUNT);
nullCounterCount++;
aggMap.put(PigWarning.NULL_COUNTER_COUNT, nullCounterCount);
}
for (Enum e : PigWarning.values()) {
if (e != PigWarning.NULL_COUNTER_COUNT) {
Long currentCount = aggMap.get(e);
currentCount = (currentCount == null ? 0 : currentCount);
// This code checks if the counters is null, if it is,
// we need to report to the user that the number
// of warning aggregations may not be correct. In fact,
// Counters should not be null, it is
// a hadoop bug, once this bug is fixed in hadoop, the
// null handling code should never be hit.
// See Pig-943
if (counters != null)
currentCount += counters.getCounter(e);
aggMap.put(e, currentCount);
}
}
}
} catch (IOException ioe) {
String msg = "Unable to retrieve job to compute warning aggregation.";
log.warn(msg);
}
}
}