Sigma-Ma opened a new pull request, #8749:
URL: https://github.com/apache/hbase/pull/8749

   JIRA: https://issues.apache.org/jira/browse/HBASE-30467
   
   ### What changes were proposed in this pull request?
   
   Exempt close-only requests for existing scanners from scan quotas. Requests 
that fetch rows, renew scanners, or open new scanners remain quota-controlled.
   
   ### Why are the changes needed?
   
   When a client is throttled, its close request can be rejected before the 
RegionServer releases the scanner. The scanner then remains allocated until its 
lease expires.
   
   ### How was this patch tested?
   
   ```bash
   mvn -B -ntp -q -pl hbase-server -am -Dtest=TestAtomicReadQuota test
   ```


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