Dan Hecht created IMPALA-6818:

             Summary: Rethink data-stream sender/receiver startup sequencing
                 Key: IMPALA-6818
                 URL: https://issues.apache.org/jira/browse/IMPALA-6818
             Project: IMPALA
          Issue Type: Sub-task
          Components: Distributed Exec
            Reporter: Dan Hecht

IMPALA-1599 introduced parallel fragment startup, which is good for startup 
latency. However, it meant that data-stream senders can start before receivers, 
and there is a timeout to handle the case when the receiver never shows up:
Sender timed out waiting for receiver fragment instance{code}
We see this timeout fairly regularly. Let's rethink how this works to see if we 
can make it robust but being careful to not sacrifice startup time too much.


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