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https://issues.apache.org/jira/browse/HBASE-19534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16294001#comment-16294001
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Ted Yu commented on HBASE-19534:
--------------------------------
lgtm
In master branch, the preStoreScannerOpen() no longer returns scanner in
RegionObserver.java
> 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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