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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4214) Scans which write should not block region split or close
Date Mon, 25 Sep 2017 18:11:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179470#comment-16179470
] 

James Taylor commented on PHOENIX-4214:
---------------------------------------

Ping [~lhofhansl]. Did you +1 this one above?

> Scans which write should not block region split or close
> --------------------------------------------------------
>
>                 Key: PHOENIX-4214
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4214
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.12.0
>            Reporter: Vincent Poon
>            Assignee: Vincent Poon
>         Attachments: PHOENIX-4214.master.v1.patch, splitDuringUpsertSelect_wip.patch
>
>
> PHOENIX-3111 introduced a scan reference counter which is checked during region preSplit
and preClose.  However, a steady stream of UPSERT SELECT or DELETE can keep the count above
0 indefinitely, preventing or greatly delaying a region split or close.
> We should try to avoid starvation of the split / close request, and fail/reject queries
where appropriate.



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