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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5001) LocalJobRunner has race condition resulting in job failures
Date Wed, 21 Aug 2013 10:56:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745932#comment-13745932
] 

Hudson commented on MAPREDUCE-5001:
-----------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #308 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/308/])
MAPREDUCE-5001. LocalJobRunner has race condition resulting in job failures. Contributed by
Sandy Ryza (jlowe: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1515863)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Cluster.java

                
> LocalJobRunner has race condition resulting in job failures 
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-5001
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5001
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.0.2-alpha
>            Reporter: Brock Noland
>            Assignee: Sandy Ryza
>             Fix For: 3.0.0, 0.23.10, 2.1.1-beta
>
>         Attachments: MAPREDUCE-5001.patch
>
>
> Hive is hitting a race condition with LocalJobRunner and the Cluster class. The JobClient
uses the Cluster class to obtain Job objects. The Cluster class uses the job.xml file to populate
the JobConf object (https://github.com/apache/hadoop-common/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Cluster.java#L184).
However, this file is deleted by the LocalJobRunner at the end of it's job (https://github.com/apache/hadoop-common/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapred/LocalJobRunner.java#L484).
> This results in the following exception:
> {noformat}
> 2013-02-11 14:45:17,755 (main) [FATAL - org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2001)]
error parsing conf file:/tmp/hadoop-brock/mapred/staging/brock1916441210/.staging/job_local_0432/job.xml
> java.io.FileNotFoundException: /tmp/hadoop-brock/mapred/staging/brock1916441210/.staging/job_local_0432/job.xml
(No such file or directory)
> 	at java.io.FileInputStream.open(Native Method)
> 	at java.io.FileInputStream.<init>(FileInputStream.java:120)
> 	at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1917)
> 	at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1870)
> 	at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1777)
> 	at org.apache.hadoop.conf.Configuration.get(Configuration.java:712)
> 	at org.apache.hadoop.mapred.JobConf.checkAndWarnDeprecation(JobConf.java:1951)
> 	at org.apache.hadoop.mapred.JobConf.<init>(JobConf.java:398)
> 	at org.apache.hadoop.mapred.JobConf.<init>(JobConf.java:388)
> 	at org.apache.hadoop.mapred.JobClient$NetworkedJob.<init>(JobClient.java:174)
> 	at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:655)
> 	at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:668)
> 	at org.apache.hadoop.mapreduce.TestMR2LocalMode.test(TestMR2LocalMode.java:40)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
> 	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> 	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
> 	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> 	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
> 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
> 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
> 	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
> 	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
> 	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
> 	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
> 	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
> 	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
> 	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
> 	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
> {noformat}
> Here is code which exposes this race fairly quickly:
> {noformat}
>     Configuration conf = new Configuration();
>     conf.set("mapreduce.framework.name", "local");
>     conf.set("mapreduce.jobtracker.address", "local");
>     File inputDir = new File("/tmp", "input-" + System.currentTimeMillis());
>     File outputDir = new File("/tmp", "output-" + System.currentTimeMillis());
>     while(true) {
>       Assert.assertTrue(inputDir.mkdirs());
>       File inputFile = new File(inputDir, "file");
>       FileUtils.copyFile(new File("/etc/passwd"), inputFile);
>       Path input = new Path(inputDir.getAbsolutePath());
>       Path output = new Path(outputDir.getAbsolutePath());
>       JobConf jobConf = new JobConf(conf, TestMR2LocalMode.class);
>       FileInputFormat.addInputPath(jobConf, input);
>       FileOutputFormat.setOutputPath(jobConf, output);      
>       JobClient jobClient = new JobClient(conf);
>       RunningJob runningJob = jobClient.submitJob(jobConf);
>       while(!runningJob.isComplete()) {
>         runningJob = jobClient.getJob(runningJob.getJobID());
>       }      
>       FileUtils.deleteQuietly(inputDir);
>       FileUtils.deleteQuietly(outputDir);
>     }
> {noformat}

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