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https://issues.apache.org/jira/browse/HIVE-20368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-20368:
----------------------------------
    Labels: pull-request-available  (was: )

> Remove VectorTopNKeyOperator lock
> ---------------------------------
>
>                 Key: HIVE-20368
>                 URL: https://issues.apache.org/jira/browse/HIVE-20368
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Teddy Choi
>            Assignee: Teddy Choi
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-20368.1.patch
>
>
> VectorTopNKeyOperator has a lock in line 199 as following.
> {code:java}
> priorityQueue.offer(WritableUtils.clone(keysWritable, getConfiguration()));
> {code}
> WritableUtils.clone calls Confgiruation.getClassByNameOrNull that has 
> synchronized block. So it needs to run without locks.



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