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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4940) division by zero in getLocalPathForWrite()
Date Mon, 14 Jan 2013 15:00:17 GMT
Ted Yu created MAPREDUCE-4940:
---------------------------------

             Summary: division by zero in getLocalPathForWrite()
                 Key: MAPREDUCE-4940
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4940
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Ted Yu


see https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/345/testReport/org.apache.hadoop.hbase.mapreduce/TestImportExport/testSimpleCase/
{code}
2013-01-12 11:53:52,809 WARN  [AsyncDispatcher event handler] resourcemanager.RMAuditLogger(255):
USER=jenkins	OPERATION=Application Finished - Failed	TARGET=RMAppManager	RESULT=FAILURE	DESCRIPTION=App
failed with state: FAILED	PERMISSIONS=Application application_1357991604658_0002 failed 1
times due to AM Container for appattempt_1357991604658_0002_000001 exited with  exitCode:
-1000 due to: java.lang.ArithmeticException: / by zero
	at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:368)
	at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:150)
	at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:131)
	at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:115)
	at org.apache.hadoop.yarn.server.nodemanager.LocalDirsHandlerService.getLocalPathForWrite(LocalDirsHandlerService.java:279)
	at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$LocalizerRunner.run(ResourceLocalizationService.java:851)

.Failing this attempt.. Failing the application.	APPID=application_1357991604658_0002
{code}
Here is related code:
{code}
        // Keep rolling the wheel till we get a valid path
        Random r = new java.util.Random();
        while (numDirsSearched < numDirs && returnPath == null) {

          long randomPosition = Math.abs(r.nextLong()) % totalAvailable;
{code}
My guess is that totalAvailable was 0, meaning dirDF was empty.

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