I think I've figured out the solution. In looking at queries in CM using the Impala Queries page and comparing that to what I see in REST API output, it looks like CM shows "Waiting for client" when a query has a finished status but does not have an end time associated with it yet.  In all the queries that I saw in CM, the one's that showed "Waiting for client" had a finished status and a start time in the REST API JSON, but did not have an end time.  I'm going to "assume" that I have this figured out now, but if anyone has any more insight into this, I would appreciate it. ... View more