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https://issues.apache.org/jira/browse/HIVE-11165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621450#comment-14621450
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Gopal V commented on HIVE-11165:
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[~jpullokkaran]: Take a look at the timeline between the threads in the
attached snapshot (ThreadID 83, 84, 85) from the 12th min to the 15th minute.
They're always switching into topological order and BFS garbage collection,
until I killed it.
> 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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