Github user ramkrish86 commented on the pull request:
https://github.com/apache/flink/pull/1553#issuecomment-177957906
I went through the code. In both cases of WordCount program with and
without explicit partition
`[Map] --hash-partition--> [Reduce]`
`[Map] --partition--> [Partition] --local-fwd--> [Reduce]`
I see that it goes to the 'else' part of the
GroupReduceWithCombineProperties#instantiate() method. I debugged once again
for both cases.
> hence, the code enters the if case, because the input shipping strategy
is FORWARD.
So with an explicit partitioner I don't see that happening. The input
shipping strategy of the PARTITION node seems to have PARTITION_HASH as the
strategy.
So what am I missing here?
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