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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 resolved HBASE-28396.
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Resolution: Fixed
Resolving. No adjustments needed.
> 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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