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https://issues.apache.org/jira/browse/HAWQ-763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haisheng Yuan resolved HAWQ-763.
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Resolution: Fixed
> 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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