[jira] [Commented] (HBASE-22460) Reopen a region if store reader references may have leaked

["Mingliang Liu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-22460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882461#comment-16882461 ] 

Mingliang Liu commented on HBASE-22460:
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Curious, once leaked, is there any other existing means healing it? If so {{refCound}} number would be enough; holding for some time might not be needed. Thanks,

> Reopen a region if store reader references may have leaked
> ----------------------------------------------------------
>
>                 Key: HBASE-22460
>                 URL: https://issues.apache.org/jira/browse/HBASE-22460
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
>            Priority: Minor
>
> We can leak store reader references if a coprocessor or core function somehow opens a scanner, or wraps one, and then does not take care to call close on the scanner or the wrapped instance. A reasonable mitigation for a reader reference leak would be a fast reopen of the region on the same server (initiated by the RS) This will release all resources, like the refcount, leases, etc. The clients should gracefully ride over this like any other region transition. This reopen would be like what is done during schema change application and ideally would reuse the relevant code. If the refcount is over some ridiculous threshold this mitigation could be triggered along with a fat WARN in the logs. 



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