Github user GenTang commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3986#discussion_r23811498
  
    --- Diff: ec2/spark_ec2.py ---
    @@ -569,15 +569,34 @@ def launch_cluster(conn, opts, cluster_name):
             master_nodes = master_res.instances
             print "Launched master in %s, regid = %s" % (zone, master_res.id)
     
    --- End diff --
    
    I agree with you. Since we can meet the same problem about propagating 
information of AWS in the `wait_for_cluster_state` function, I think that 
adding waiting time is much better workaround. 
    The only disadvantage is that we need more 10 second to launch a cluster.


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