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https://issues.apache.org/jira/browse/HIVE-11165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621431#comment-14621431
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Laljo John Pullokkaran commented on HIVE-11165:
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[~gopalv] How did we get to the conclusion that Calcite is not thread safe?
> Calcite planner might have a thread-safety issue compiling in parallel
> ----------------------------------------------------------------------
>
> Key: HIVE-11165
> URL: https://issues.apache.org/jira/browse/HIVE-11165
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 2.0.0
> Reporter: Gopal V
> Assignee: Laljo John Pullokkaran
> Attachments: RunJar-2015-06-30.snapshot
>
>
> After about 6 minutes trying to plan a query, the HiveServer2 was killed to
> restore functionality to a test run.
> The HEP planner is stuck on a TopologicalOrder traversal and there were no
> queries being fed into the HiveServer2 after it got stuck.
> TPC-DS query13 was the query in question, at 4 way parallel, which triggered
> the issue.
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