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https://issues.apache.org/jira/browse/HIVE-77?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651321#action_12651321
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Joydeep Sen Sarma commented on HIVE-77:
---------------------------------------
this patch includes:
- test for multithreaded execution
- fixes to SessionState.java and CliDriver.java for MT safe (and to run MT
tests)
however - the test is disabled. while this seems to fix issues with session
management etc. - there are bugs in metastore client code that are not
resolved. i would like to file a separate jira for those.
unfortunately metastore client issues are not limited to DDLTasks only -
regular table metadata fetches are also affected. (the patch allows testing of
clientpositive queries without running DDL commands in MT mode - but in an
extremely hacky way)
> thread safe query execution
> ---------------------------
>
> Key: HIVE-77
> URL: https://issues.apache.org/jira/browse/HIVE-77
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: Joydeep Sen Sarma
> Attachments: hive-77.patch.1
>
>
> this came up in hive-30 where there's a multithreaded hive server in the
> works. at the minimum, the sessionstate objects should be thread local
> singletons. but filing a more general bug that can cover this issue + code
> audit for any other static variables + test suite for running queries from a
> multi-threaded environment
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