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https://issues.apache.org/jira/browse/HADOOP-912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466389
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Arun C Murthy commented on HADOOP-912:
--------------------------------------
I suspect this is more of a drawback of the TestMiniMRWithDFS than the
MR-framework itself...
MiniMrCluster.waitUntilIdle checks for any 'running' tasks on the
TaskTracker... post HADOOP-840 the TaskTracker the cleanup actions are queued
and are done offline, which the test-case isn't aware of ; which I suspect
leads to a timing issue where the TaskTracker is rightly *idle* and the
'cleanup thread' hasn't kicked in yet...
Should we add a 'sleep' in MiniMRCluster.waitUntilIdle or perhaps another api
to check if the job has finished and has been cleaned-up? Thoughts?
> TestMiniMRWithDFS fails sporadically
> ------------------------------------
>
> Key: HADOOP-912
> URL: https://issues.apache.org/jira/browse/HADOOP-912
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.10.1
> Reporter: Nigel Daley
> Assigned To: Arun C Murthy
>
> TestMiniMRWithDFS fails sporadically with the following error:
> junit.framework.AssertionFailedError: Spurious directory task_0001_m_000008_0
> found in
> C:\hudson\workspace\Hadoop-WindowsSmokeTest\trunk\build\test\mapred\local\50068_0
> at
> org.apache.hadoop.mapred.TestMiniMRWithDFS.checkTaskDirectories(TestMiniMRWithDFS.java:128)
> at
> org.apache.hadoop.mapred.TestMiniMRWithDFS.testWithDFS(TestMiniMRWithDFS.java:163)
> This tests checks that all mapred.local.dirs have been cleaned up after
> running a mapred job on MiniMRCluster. Effectively, this tests waits for
> TaskTracker.isIdle() to return true before checking the dirs have been
> cleaned up. I believe that HADOOP-639 reordered the cleanup code so that
> isIdle() will return true before the directory cleanup is complete.
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