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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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Teddy Choi reassigned HIVE-20368:
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> 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
>
> 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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