Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/304#issuecomment-70525444
JodaTime alone has about 20 classes. Not for all of them are serializers
available, it would be quite a bit of work to add all those.
Adding a big set of common cases means registering 50+ serializers at kryo
every time we create a kryo instance.
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