Github user techaddict commented on the pull request:
https://github.com/apache/spark/pull/12913#issuecomment-217034618
@vectorijk The class Kryo Serializer is not wire-compatible, so IMO we
should be ok. Either one uses Unsafe or safe based at a time.
Comment from the KryoSerializer class
```Note that this serializer is not guaranteed to be wire-compatible across
different versions of
Spark. It is intended to be used to serialize/de-serialize data within a
single
Spark application.```
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