Lei Yang created HDFS-17290:
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             Summary: HDFS: add client rpc backoff metrics due to throttling 
from lowest priority queue
                 Key: HDFS-17290
                 URL: https://issues.apache.org/jira/browse/HDFS-17290
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.3.6, 2.10.0
            Reporter: Lei Yang
            Assignee: Lei Yang


Clients are backoff when rpcs cannot be enqueued. However there are cases when 
this could happen. Example assumes prio

 
 # Client are directly enqueued into lowest priority queue and backoff when 
lowest queue is full. Client are expected to disconnect from namenode.
 # Client are enqueued into non-lowest priority queue and overflowed all the 
way down to lowest priority queue and back off. In this case, connection 
between client and namenode remains open.



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