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https://issues.apache.org/jira/browse/HBASE-4207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116770#comment-13116770
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stack commented on HBASE-4207:
------------------------------
I learned that this parallel mechanism only works if you do NOT for to run
tests:
http://stackoverflow.com/questions/3600090/maven-surefire-unable-to-fork-parallel-test-execution/7426894#7426894
My sense is we have to fork to protect against tests that run wild (or if we
move the crazies into integrated test category, maybe we could run non-forked).
Trying to build w/o forking, most tests pass. A few fail such as
TestTableMapReduce and TestCompaction. Would have to look at these.
When I try w/ parallel on, we are running 1/10th of the tests (but they run
fast).
> Run test suite in parallel, multiple concurrent test instances.
> ---------------------------------------------------------------
>
> Key: HBASE-4207
> URL: https://issues.apache.org/jira/browse/HBASE-4207
> Project: HBase
> Issue Type: Task
> Components: test
> Reporter: stack
> Attachments: parallel.build.txt
>
>
> From a suggestion by Lohit up on the list, surefire allows running unit tests
> in parallel. I'm trying it. I'll attach the patch to do classes in
> parallel (as opposed to methods) with four threads per core max.
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