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Posted to issues@hive.apache.org by "Denys Kuzmenko (Jira)" <ji...@apache.org> on 2020/04/27 07:52:00 UTC

[jira] [Work started] (HIVE-23293) Locks: Implement zero-wait readers

     [ https://issues.apache.org/jira/browse/HIVE-23293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-23293 started by Denys Kuzmenko.
---------------------------------------------
> 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
>
>
> 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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