Github user okram commented on the issue:
https://github.com/apache/incubator-tinkerpop/pull/325
@dalaro -- you mention:
```
spark.serializer=KryoSerializer
spark.kryo.registrator=com.tinkerpop.something.TinkerPopRegistrator
```
I think we need:
```
spark.serializer=KryoSerializer
spark.kryo.registrator=org.apache.tinkerpop.gremlin.structure.io.gryo.GryoRegistrar
```
`GryoRegistrar` would have all the `GryoMapper` classes registered which,
when people do custom registrations (e.g. `Point`,
`MyStupidStringImplementation`), it will be in `GryoMapper`. Can you provide
something like that in this PR? Hard? @spmallette knows more about how to
interact with `GryoMapper` to get our the serializers...
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