Github user zhangminglei commented on the issue:
https://github.com/apache/flink/pull/4166
@tzulitai Sorry for delay. What you mean is that I should first implement
or support ```Kryo.setDefaultSerializer(...)``` method in
```ExecutionConfig```, and that is the solution for this issue. I understand
right ? If I am wrong, please helps me out. Thank you !
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