Github user thvasilo commented on a diff in the pull request:
https://github.com/apache/spark/pull/4916#discussion_r25882813
--- Diff: ec2/spark_ec2.py ---
@@ -1259,6 +1259,15 @@ def real_main():
cluster_instances=(master_nodes + slave_nodes),
cluster_state='ssh-ready'
)
+
+ # Determine types of running instances
+ existing_master_type = master_nodes[0].instance_type
+ existing_slave_type = slave_nodes[0].instance_type
+ if existing_master_type == existing_slave_type:
+ existing_master_type = ""
+ opts.master_instance_type = existing_master_type
--- End diff --
You are correct. Perhaps giving the user the option to change the instance
type is a good middle ground. But mis-representing the instance type by having
the default value can cause problems as we saw, without the user's knowledge.
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