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https://issues.apache.org/jira/browse/HIVE-10647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14602156#comment-14602156
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Gunther Hagleitner commented on HIVE-10647:
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i think you need the same check for both semaphore acquire as well as release.
Otherwise you'll end up releasing it w/o having ever acquired.
> Hive on LLAP: Limit HS2 from overwhelming LLAP
> ----------------------------------------------
>
> Key: HIVE-10647
> URL: https://issues.apache.org/jira/browse/HIVE-10647
> Project: Hive
> Issue Type: Bug
> Components: Tez
> Affects Versions: llap
> Reporter: Vikram Dixit K
> Assignee: Vikram Dixit K
> Attachments: HIVE-10647.1.patch, HIVE-10647.2.patch,
> HIVE-10647.3.patch
>
>
> We want to restrict the number of queries that flow through LLAP.
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