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https://issues.apache.org/jira/browse/HIVE-22906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Denys Kuzmenko updated HIVE-22906:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
> Redundant checkLock Mutex blocks concurrent Lock requests
> ---------------------------------------------------------
>
> Key: HIVE-22906
> URL: https://issues.apache.org/jira/browse/HIVE-22906
> Project: Hive
> Issue Type: Improvement
> Components: Locking
> Reporter: Denys Kuzmenko
> Assignee: Denys Kuzmenko
> Priority: Major
> Attachments: HIVE-22906.1.patch
>
>
> enqueueLocks is already serialising locks creation via (SELECT NL_NEXT FROM
> NEXT_LOCK_ID FOR UPDATE). Requested locks would be assigned 'W' state.
> checkLock is iterating over the sorted set of conflicting locks below current
> EXT_LOCK_ID. It does handle the situation when there is conflicting lock with
> lower ID in 'W' state - lock request would be denied and retried later.
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