Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3607
@sunjincheng121 - Apperently there were many conflicts...most of them were
stupid conflicts when git was trying to do the automatic merging.
At least in 2 classes the methods you added and the ones i added were put
one into the other...instead of one after the other. If you look over the
classes you we see that actually there are not so many actual modifications :)
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