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https://issues.apache.org/jira/browse/HIVE-7271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040279#comment-14040279
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Szehon Ho commented on HIVE-7271:
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Oh yea I hit that once, there's some statics in ExecMapper that don't get reset
after the MR job, and result in some error if you run more than one query in
localJobRunner, hence they forced the localJobRunner jobs to run out of
process. Not sure, but it may still be an issue that needs to be fixed, for
this to work.
> Speed up unit tests
> -------------------
>
> Key: HIVE-7271
> URL: https://issues.apache.org/jira/browse/HIVE-7271
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-7271.1.patch
>
>
> Did some experiments to see if there's a way to speed up unit tests.
> TestCliDriver seemed to take a lot of time just spinning up/tearing down
> JVMs. I was also curious to see if running everything on a ram disk would
> help.
> Results (I ran tests up to authorization_2):
> - Current setup: 40 minutes
> - Single JVM (not using child JVM to run all queries): 8 minutes
> - Single JVM + ram disk: 7 minutes
> So the ram disk didn't help that much. But running tests in single JVM seems
> worthwhile doing.
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