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https://issues.apache.org/jira/browse/HIVE-29651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090567#comment-18090567
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Ayush Saxena commented on HIVE-29651:
-------------------------------------
Committed to master.
Thanx [~tanishqchugh] for the contribution!!!
> Update ZookeeperExternalSessionsRegistryClient to handle multiple HiveServer2
> instances submitting DAGs concurrently to available Tez External Sessions
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-29651
> URL: https://issues.apache.org/jira/browse/HIVE-29651
> Project: Hive
> Issue Type: Bug
> Reporter: tanishqchugh
> Assignee: tanishqchugh
> Priority: Major
> Labels: pull-request-available
>
> Currently, ZookeeperExternalSessionsRegistryClient tracks the availability of
> Tez AMs using local HashSets. In deployments with multiple HS2 instances,
> this state is not synchronized across all the HS2 instances. Consequently,
> when one HS2 occupies a Tez AM by submitting a DAG, the other HS2 instances
> remain unaware of this status change. This causes out-of-sync HS2s to submit
> new DAGs to already-occupied Tez AMs, resulting in execution errors.
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