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https://issues.apache.org/jira/browse/HIVE-19813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16506643#comment-16506643
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Daniel Dai commented on HIVE-19813:
-----------------------------------
Retest.
> SessionState.start don't have to be synchronized
> ------------------------------------------------
>
> Key: HIVE-19813
> URL: https://issues.apache.org/jira/browse/HIVE-19813
> Project: Hive
> Issue Type: Bug
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Priority: Major
> Attachments: HIVE-19813.1.patch, HIVE-19813.2.patch,
> HIVE-19813.3.patch
>
>
> This is introduced in HIVE-14690. However, only check-set block needs to be
> synchronized, not the whole block. The method will start Tez AM, which is a
> long operation. Make the method synchronized will serialize session start
> thus slow down hs2.
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