Github user nchammas commented on a diff in the pull request:
https://github.com/apache/spark/pull/3986#discussion_r23891135
--- Diff: ec2/spark_ec2.py ---
@@ -569,6 +569,8 @@ def launch_cluster(conn, opts, cluster_name):
master_nodes = master_res.instances
print "Launched master in %s, regid = %s" % (zone, master_res.id)
+ # Wait for the information of the just-launched instances to be
propagated within AWS
+ time.sleep(5)
--- End diff --
Sure. Also, in the comments, reference SPARK-4983.
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