[jira] [Created] (HBASE-10662) RegionScanner should be closed and according lease should be cancelled in regionserver immediately if the related region has been re-opened during performing scan request

["Feng Honghua (JIRA)" <ji...@apache.org>]

Feng Honghua created HBASE-10662:
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             Summary: RegionScanner should be closed and according lease should be cancelled in regionserver immediately if 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


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.

Sounds reasonable to cleanup all related scanners and cancel these scanners' leases after closing a region?



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