Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/814#issuecomment-114080543
I am unsure of where this leads us. The purpose of `Writable` is to make
sure that we can use the Writable's custom serialization. If the type
`Writable` itself is now treated as a generic type, it is serialized with Kryo
and that voids the assumption that it uses its own serialization code.
What is the reason for doing it this way? Throwing an error that "raw"
Writables are not supported would help them understand the issues easier...
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