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https://issues.apache.org/jira/browse/MAPREDUCE-925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749576#action_12749576
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Konstantin Boudnik commented on MAPREDUCE-925:
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bq. The test suite was never intended to be running parallel tests as most of
the test share the same temporary space
Are you saying that tests have hardcoded paths for temp. output, etc.? It
doesn't seem like a very flexible way of making 'portable' tests which can be
executed on different platforms with, potentially, different temp. location
mounts. I think the rule of thumb is not to let tests to step on each other
feet in terms of temp. data files, output and all that.
> Not able to run parallel instances of ant tests
> -----------------------------------------------
>
> Key: MAPREDUCE-925
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-925
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: test
> Affects Versions: 0.20.1
> Reporter: Suman Sehgal
> Priority: Minor
>
> Not able to execute two or more parallel instances of ant test.
> Scenario:
> =======
> Executed "TestRecoveryManager" in a loop for 100 times and ran some other
> tests in parallel. Encountered following error message in TestRecoveryManager
> logs:
> [junit] 2009-08-27 10:53:48,724 INFO mapred.TaskTracker
> (TaskTracker.java:tryToGetOutputSize(1594)) -
> org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find
> taskTracker/jobcache/<job-id>/<attempt-id>/output/file.out in any of the
> configured local directories
> It seems that new ant test removes the existing mapred local directory itself
> and recreates it for current test.
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