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Posted to dev@phoenix.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2017/09/15 20:19:00 UTC
[jira] [Commented] (PHOENIX-4214) Scans which write should not
block region split or close
[ https://issues.apache.org/jira/browse/PHOENIX-4214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168457#comment-16168457 ]
Lars Hofhansl commented on PHOENIX-4214:
----------------------------------------
I think unless we suspend a thread or the JVM is shutting down, the finally will get executed. (the documentation, however, is a bit unclear on this)
> 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
> Attachments: 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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