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https://issues.apache.org/jira/browse/HBASE-28396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk reopened HBASE-28396:
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Reopening while we resolve the branch-2.6 compatibility issue flagged on the
2.6.1rc0 VOTE thread,
https://lists.apache.org/thread/j3sv12msdcpk9sh4g7hq5v8q560zknjn
This one has no api incompatibility itself, it only needs an addendum in the
event that HBASE-28346 is reverted.
> Quota throttling can cause a leak of scanners
> ---------------------------------------------
>
> Key: HBASE-28396
> URL: https://issues.apache.org/jira/browse/HBASE-28396
> Project: HBase
> Issue Type: Bug
> Reporter: Bryan Beaudreault
> Assignee: Hernan Gelaf-Romer
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.7.0, 3.0.0-beta-2, 2.6.1
>
>
> In RSRpcServices.scan, we check the quota after having created a new
> RegionScannerHolder. If the quota is exceeded, an exception will be thrown.
> In this case, we can't send the scannerName back to the client because it's
> just an exception. So the client will be forced to retry the openScanner
> call, but the RegionScannerHolder is not closed. Eventually the scanners will
> be cleaned up by the lease expiration, but this could cause many scanners to
> leak during periods of high throttling.
> We could close the newly opened scanner before throwing the throttle
> exception, but I think it's better to not open the scanner at all until we've
> grabbed some quota.
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