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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5001) LocalJobRunner has race condition resulting in job failures
Date Mon, 11 Feb 2013 20:55:13 GMT
Brock Noland created MAPREDUCE-5001:
---------------------------------------

             Summary: 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


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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