[jira] [Commented] (HAWQ-763) Remove traceflag that allows ORCA to run in multiple threads

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HAWQ-763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344783#comment-15344783 ] 

ASF GitHub Bot commented on HAWQ-763:
-------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/incubator-hawq/pull/644


> Remove traceflag that allows ORCA to run in multiple threads
> ------------------------------------------------------------
>
>                 Key: HAWQ-763
>                 URL: https://issues.apache.org/jira/browse/HAWQ-763
>             Project: Apache HAWQ
>          Issue Type: Improvement
>          Components: Optimizer
>            Reporter: Haisheng Yuan
>            Assignee: Lei Chang
>
> We are integrating VEM with GPOS memory allocator. VMEM is not thread safe. So, ORCA/GPOS also need to be single threaded. Currently, HAWQ users are using only the single threaded Orca.
> So need to remove the traceflag that allows ORCA to run in multiple threads so that HAWQ users do not accidentally run ORCA in multiple threads.



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