Github user EugenCepoi commented on the pull request:
https://github.com/apache/spark/pull/10203#issuecomment-162990380
That problem actually applies to all types for which Kryo provides a
default ser/de. Mostly because kryo will try to deserialize to the type known
during registration and this syntax `new Foo with Bar` generates a class. I am
wondering if this can't also occur for plain pojo/poso for which kryo will use
it generic deser system. In short I think it is better to just use the java
impl and eventually report that kind of problem to kryo chil project. Anyway
SynchronizedMap is deperecated in scala 2.11.
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