Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2623
@mxm @chermenin Can we please do a followup to this, given that it is
already merged?
The tests in `GroupReduceITCase` need to be replaced by proper targeted
unit tests.
Sorry for being super strict, but our build times are already exploding,
and it is exactly cases like this one (adding distributed runtime Integration
Tests to test a serializer) that contribute a lot to that.
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