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https://issues.apache.org/jira/browse/MAPREDUCE-925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748818#action_12748818
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Steve Loughran commented on MAPREDUCE-925:
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There is a way to run tests in parallel using vmware, virtualbox or equivalent:
have a VM run the tests off a mounted copy of the files. To get things to work
best, set build.dir to something local, so that generated results on one VM
don't interfere with the others.
> 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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