Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/814#issuecomment-114860764
I did not mean a special Kryo serializer but our very own
`WritableSerializer`. With the current implementation `WritableTypeInformation`
has precedence over `GenericTypeInfo`. This means that if the `TypeExtractor`
sees a `Writable` subtype, then it creates a `WritableTypeInfo`. If the type is
the `Writable` interface, then a `GenericTypeInfo` is returned and, thus, Kryo
is used.
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