Github user hequn8128 commented on the issue:
https://github.com/apache/flink/pull/4674
hi, @fhueske
I was using sliding window and `NotSerializableException` was thrown when
doing incremental snapshot. This can be fixed by implementing
`SingleElementIterable` with `Serializable`.
This problem may only exists in our internal flink but i am not sure
considering that I am unfamiliar with runtime part. In our internal flink,
`InternalStateDescriptor` will be serialized which lead to the
`NotSerializableException`, however I can't find the same logic in flink. I
tried to write checkpoint tests to reproduce the problem but failed. It will be
very grateful if you can give me some advice to figure it out.
Thanks, Hequn
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