tanishqchugh created HIVE-29651:
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Summary: 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
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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