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https://issues.apache.org/jira/browse/HIVE-23293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17096370#comment-17096370
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Denys Kuzmenko commented on HIVE-23293:
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Pushed to master.
[~mbod], [~pvary] thank you for review!
> Locks: Implement zero-wait readers
> -----------------------------------
>
> Key: HIVE-23293
> URL: https://issues.apache.org/jira/browse/HIVE-23293
> Project: Hive
> Issue Type: Sub-task
> Reporter: Denys Kuzmenko
> Assignee: Denys Kuzmenko
> Priority: Major
> Attachments: HIVE-23293.1.patch, HIVE-23293.2.patch,
> HIVE-23293.3.patch
>
>
> With a new lock type (EXCL_WRITE) for INSERT_OVERWRITE, SHARED_READ does not
> have to wait for any lock - it can fails fast for a pending EXCLUSIVE,
> because even if there is an EXCL_WRITE or SHARED_WRITE pending, there's no
> semantic reason to wait for them.
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