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https://issues.apache.org/jira/browse/HBASE-10662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13920501#comment-13920501
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ramkrishna.s.vasudevan commented on HBASE-10662:
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lgtm.
> RegionScanner should be closed and according lease should be cancelled in
> regionserver immediately if we find the related region has been re-opened
> during performing scan request
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-10662
> URL: https://issues.apache.org/jira/browse/HBASE-10662
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Feng Honghua
> Assignee: Feng Honghua
> Attachments: HBASE-10662-trunk_v1.patch
>
>
> During regionserver processes scan request from client, it fails the request
> by throwing a wrapped NotServingRegionException to client if it finds the
> region related to the passed-in scanner-id has been re-opened, and it also
> removes the RegionScannerHolder from the scanners. In fact under this case,
> the old and invalid RegionScanner related to the passed-in scanner-id should
> be closed and the related lease should be cancelled at the mean time as well.
> Currently region's related scanners aren't closed when closing the region, a
> region scanner is closed only when requested explicitly by client, or by
> expiration of the related lease, in this sense the close of region scanners
> is quite passive and lag.
> When regionserver processes scan request from client and can't find online
> region corresponding to the passed-in scanner-id (due to being moved out) or
> find the region has been re-opened, it throws NotServingRegionException and
> removes the corresponding RegionScannerHolder from scanners without closing
> the related region scanner (nor cancelling the related lease), but when the
> lease expires, the related region scanner still doesn't be closed since it
> doesn't present in scanners now.
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