Yi Mei created HBASE-21783:
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             Summary: Support allow exceed user/table/ns rpc throttle quota if 
region server has available quota
                 Key: HBASE-21783
                 URL: https://issues.apache.org/jira/browse/HBASE-21783
             Project: HBase
          Issue Type: Sub-task
            Reporter: Yi Mei


Currently, all types of rpc throttle quota (include region server, namespace, 
table and user quota) are hard limit, which means once requests exceed the 
amount, they will be throttled.
In some situation, user use out of all their own quotas but region server still 
has available quota because other users don't consume at the same time, in this 
case, we can allow user consume additional quota. So add a configuration named 
ALLOW_EXCEED  to meet this requirement when set region server quota.



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