/**
* 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.hadoop.hive.ql.io.rcfile.merge;
import java.io.IOException;
import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.DriverContext;
import org.apache.hadoop.hive.ql.QueryPlan;
import org.apache.hadoop.hive.ql.exec.HadoopJobExecHelper;
import org.apache.hadoop.hive.ql.exec.HadoopJobExecHook;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.exec.Throttle;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.io.CombineHiveInputFormat;
import org.apache.hadoop.hive.ql.io.HiveOutputFormatImpl;
import org.apache.hadoop.hive.ql.plan.api.StageType;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.ql.session.SessionState.LogHelper;
import org.apache.hadoop.hive.shims.ShimLoader;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.Counters;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RunningJob;
import org.apache.log4j.Appender;
import org.apache.log4j.FileAppender;
import org.apache.log4j.LogManager;
@SuppressWarnings( { "deprecation", "unchecked" })
public class BlockMergeTask extends Task<MergeWork> implements Serializable,
HadoopJobExecHook {
private static final long serialVersionUID = 1L;
protected transient JobConf job;
protected HadoopJobExecHelper jobExecHelper;
@Override
public void initialize(HiveConf conf, QueryPlan queryPlan,
DriverContext driverContext) {
super.initialize(conf, queryPlan, driverContext);
job = new JobConf(conf, BlockMergeTask.class);
jobExecHelper = new HadoopJobExecHelper(job, this.console, this, this);
}
@Override
public boolean requireLock() {
return true;
}
boolean success = true;
@Override
/**
* start a new map-reduce job to do the merge, almost the same as ExecDriver.
*/
public int execute(DriverContext driverContext) {
HiveConf.setVar(job, HiveConf.ConfVars.HIVEINPUTFORMAT,
CombineHiveInputFormat.class.getName());
success = true;
ShimLoader.getHadoopShims().prepareJobOutput(job);
job.setOutputFormat(HiveOutputFormatImpl.class);
job.setMapperClass(work.getMapperClass());
Context ctx = driverContext.getCtx();
boolean ctxCreated = false;
try {
if (ctx == null) {
ctx = new Context(job);
ctxCreated = true;
}
}catch (IOException e) {
e.printStackTrace();
console.printError("Error launching map-reduce job", "\n"
+ org.apache.hadoop.util.StringUtils.stringifyException(e));
return 5;
}
job.setMapOutputKeyClass(NullWritable.class);
job.setMapOutputValueClass(NullWritable.class);
if(work.getNumMapTasks() != null) {
job.setNumMapTasks(work.getNumMapTasks());
}
// zero reducers
job.setNumReduceTasks(0);
if (work.getMinSplitSize() != null) {
HiveConf.setLongVar(job, HiveConf.ConfVars.MAPREDMINSPLITSIZE, work
.getMinSplitSize().longValue());
}
if (work.getInputformat() != null) {
HiveConf.setVar(job, HiveConf.ConfVars.HIVEINPUTFORMAT, work
.getInputformat());
}
String inpFormat = HiveConf.getVar(job, HiveConf.ConfVars.HIVEINPUTFORMAT);
if ((inpFormat == null) || (!StringUtils.isNotBlank(inpFormat))) {
inpFormat = ShimLoader.getHadoopShims().getInputFormatClassName();
}
LOG.info("Using " + inpFormat);
try {
job.setInputFormat((Class<? extends InputFormat>) (Class
.forName(inpFormat)));
} catch (ClassNotFoundException e) {
throw new RuntimeException(e.getMessage());
}
String outputPath = this.work.getOutputDir();
Path tempOutPath = Utilities.toTempPath(new Path(outputPath));
try {
FileSystem fs = tempOutPath.getFileSystem(job);
if (!fs.exists(tempOutPath)) {
fs.mkdirs(tempOutPath);
}
} catch (IOException e) {
console.printError("Can't make path " + outputPath + " : " + e.getMessage());
return 6;
}
RCFileBlockMergeOutputFormat.setMergeOutputPath(job, new Path(outputPath));
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(NullWritable.class);
HiveConf.setBoolVar(job,
HiveConf.ConfVars.HIVEMERGECURRENTJOBHASDYNAMICPARTITIONS,
work.hasDynamicPartitions());
int returnVal = 0;
RunningJob rj = null;
boolean noName = StringUtils.isEmpty(HiveConf.getVar(job,
HiveConf.ConfVars.HADOOPJOBNAME));
String jobName = null;
if (noName && this.getQueryPlan() != null) {
int maxlen = conf.getIntVar(HiveConf.ConfVars.HIVEJOBNAMELENGTH);
jobName = Utilities.abbreviate(this.getQueryPlan().getQueryStr(),
maxlen - 6);
}
if (noName) {
// This is for a special case to ensure unit tests pass
HiveConf.setVar(job, HiveConf.ConfVars.HADOOPJOBNAME,
jobName != null ? jobName : "JOB" + Utilities.randGen.nextInt());
}
try {
addInputPaths(job, work);
Utilities.setMapRedWork(job, work, ctx.getMRTmpFileURI());
// remove the pwd from conf file so that job tracker doesn't show this
// logs
String pwd = HiveConf.getVar(job, HiveConf.ConfVars.METASTOREPWD);
if (pwd != null) {
HiveConf.setVar(job, HiveConf.ConfVars.METASTOREPWD, "HIVE");
}
JobClient jc = new JobClient(job);
String addedJars = Utilities.getResourceFiles(job, SessionState.ResourceType.JAR);
if (!addedJars.isEmpty()) {
job.set("tmpjars", addedJars);
}
// make this client wait if job trcker is not behaving well.
Throttle.checkJobTracker(job, LOG);
// Finally SUBMIT the JOB!
rj = jc.submitJob(job);
returnVal = jobExecHelper.progress(rj, jc);
success = (returnVal == 0);
} catch (Exception e) {
e.printStackTrace();
String mesg = " with exception '" + Utilities.getNameMessage(e) + "'";
if (rj != null) {
mesg = "Ended Job = " + rj.getJobID() + mesg;
} else {
mesg = "Job Submission failed" + mesg;
}
// Has to use full name to make sure it does not conflict with
// org.apache.commons.lang.StringUtils
console.printError(mesg, "\n"
+ org.apache.hadoop.util.StringUtils.stringifyException(e));
success = false;
returnVal = 1;
} finally {
try {
if (ctxCreated) {
ctx.clear();
}
if (rj != null) {
if (returnVal != 0) {
rj.killJob();
}
HadoopJobExecHelper.runningJobKillURIs.remove(rj.getJobID());
jobID = rj.getID().toString();
}
RCFileMergeMapper.jobClose(outputPath, success, job, console);
} catch (Exception e) {
}
}
return (returnVal);
}
private void addInputPaths(JobConf job, MergeWork work) {
for (String path : work.getInputPaths()) {
FileInputFormat.addInputPath(job, new Path(path));
}
}
@Override
public String getName() {
return "RCFile Merge";
}
public static String INPUT_SEPERATOR = ":";
public static void main(String[] args) {
ArrayList<String> jobConfArgs = new ArrayList<String>();
String inputPathStr = null;
String outputDir = null;
try {
for (int i = 0; i < args.length; i++) {
if (args[i].equals("-input")) {
inputPathStr = args[++i];
} else if (args[i].equals("-jobconf")) {
jobConfArgs.add(args[++i]);
} else if (args[i].equals("-outputDir")) {
outputDir = args[++i];
}
}
} catch (IndexOutOfBoundsException e) {
System.err.println("Missing argument to option");
printUsage();
}
if (inputPathStr == null || outputDir == null
|| outputDir.trim().equals("")) {
printUsage();
}
List<String> inputPaths = new ArrayList<String>();
String[] paths = inputPathStr.split(INPUT_SEPERATOR);
if (paths == null || paths.length == 0) {
printUsage();
}
FileSystem fs = null;
JobConf conf = new JobConf(BlockMergeTask.class);
for (String path : paths) {
try {
Path pathObj = new Path(path);
if (fs == null) {
fs = FileSystem.get(pathObj.toUri(), conf);
}
FileStatus fstatus = fs.getFileStatus(pathObj);
if (fstatus.isDir()) {
FileStatus[] fileStatus = fs.listStatus(pathObj);
for (FileStatus st : fileStatus) {
inputPaths.add(st.getPath().toString());
}
} else {
inputPaths.add(fstatus.getPath().toString());
}
} catch (IOException e) {
e.printStackTrace(System.err);
}
}
StringBuilder sb = new StringBuilder("JobConf:\n");
for (String one : jobConfArgs) {
int eqIndex = one.indexOf('=');
if (eqIndex != -1) {
try {
String key = one.substring(0, eqIndex);
String value = URLDecoder.decode(one.substring(eqIndex + 1), "UTF-8");
conf.set(key, value);
sb.append(key).append("=").append(value).append("\n");
} catch (UnsupportedEncodingException e) {
System.err.println("Unexpected error " + e.getMessage()
+ " while encoding " + one.substring(eqIndex + 1));
System.exit(3);
}
}
}
HiveConf hiveConf = new HiveConf(conf, BlockMergeTask.class);
Log LOG = LogFactory.getLog(BlockMergeTask.class.getName());
boolean isSilent = HiveConf.getBoolVar(conf,
HiveConf.ConfVars.HIVESESSIONSILENT);
LogHelper console = new LogHelper(LOG, isSilent);
// print out the location of the log file for the user so
// that it's easy to find reason for local mode execution failures
for (Appender appender : Collections
.list((Enumeration<Appender>) LogManager.getRootLogger()
.getAllAppenders())) {
if (appender instanceof FileAppender) {
console.printInfo("Execution log at: "
+ ((FileAppender) appender).getFile());
}
}
// log the list of job conf parameters for reference
LOG.info(sb.toString());
MergeWork mergeWork = new MergeWork(inputPaths, outputDir);
DriverContext driverCxt = new DriverContext();
BlockMergeTask taskExec = new BlockMergeTask();
taskExec.initialize(hiveConf, null, driverCxt);
taskExec.setWork(mergeWork);
int ret = taskExec.execute(driverCxt);
if (ret != 0) {
System.exit(2);
}
}
private static void printUsage() {
System.err.println("BlockMergeTask -input <colon seperated input paths> "
+ "-outputDir outputDir [-jobconf k1=v1 [-jobconf k2=v2] ...] ");
System.exit(1);
}
@Override
public StageType getType() {
return StageType.MAPRED;
}
@Override
public boolean checkFatalErrors(Counters ctrs, StringBuilder errMsg) {
return false;
}
@Override
public void logPlanProgress(SessionState ss) throws IOException {
// no op
}
@Override
public void updateCounters(Counters ctrs, RunningJob rj) throws IOException {
// no op
}
@Override
protected void localizeMRTmpFilesImpl(Context ctx) {
// no op
}
}