Manikandan R created IMPALA-6569:

             Summary: Admission Control: Query queued when pool is free
                 Key: IMPALA-6569
             Project: IMPALA
          Issue Type: Bug
            Reporter: Manikandan R

At times, observed that queries has been queued when pool is idle - no other 
queries are running in the pool. There are couple of incidents. Observation for 
one of the incidents is as follows:

Had come across a situation where in queue started building up on specific 
pool. On analysis, come to know that queuing happens only when query is hitting 
1 specific node. Then executed a simple query directly (using impala shell) on 
that node has been queued, whereas, same query executed in other nodes are able 
to admit immediately and completes its execution even though both these runs 
are using the same pool. I think that  problematic node had this problem and 
then it is clearing off automatically, but am not sure. But in this case, 
restarted daemon. I suspect somehow admission control accountability info (How 
much has used? How much left? etc) is not available in this node for some 
reasons. Please share your view on this.

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