Github user uce commented on the pull request:
https://github.com/apache/flink/pull/1255#issuecomment-165400271
Sorry for not responding earlier. I've missed the notification somehow.
Batch exchange (the blocking intermediate results) do not work within
iterations. Therefore the optimizer never sets the exchange mode to batch
within iterations currently.
I think we need to suppress range partitionings within iterations for the
time being.
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