Bryan Beaudreault created HBASE-28396:
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Summary: 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
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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