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https://issues.apache.org/jira/browse/PHOENIX-4214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16181554#comment-16181554
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Vincent Poon commented on PHOENIX-4214:
---------------------------------------
Thanks [~jamestaylor], I'll take a look. IIRC the WIP was working on 0.98 so
should be easy to adapt. I'll try to get a patch up for 0.98 soon.
> 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-4214-4.x-HBase-0.98_v1.patch,
> 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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