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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19534) Document risks of RegionObserver.preStoreScannerOpen
Date Sat, 23 Dec 2017 18:19:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16302528#comment-16302528
] 

Lars Hofhansl commented on HBASE-19534:
---------------------------------------

Good for all branches?

> Document risks of RegionObserver.preStoreScannerOpen
> ----------------------------------------------------
>
>                 Key: HBASE-19534
>                 URL: https://issues.apache.org/jira/browse/HBASE-19534
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: 19534-0.98.txt
>
>
> We just had an outage because we used preStoreScannerOpen, which, in our case, created
a new StoreScanner. In HBase versions before 1.3 this caused a definite memory leak, a reference
to the old StoreScanner (if not null) would be held by the store until the region is closed.
> The 1.3 and later there's no such leak, but still the old scanner is not properly closed.
> This should be added to the Javadoc and the ZooKeeperScanPolicyObserver example should
be fixed.



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