Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/789#issuecomment-50441305
Ah, I see. In that case I'd prefer something like this:
```
MLlibUtils.registerKryoClasses(conf)
GraphXUtils.registerKryoClasses(conf)
conf.registerKryoClasses(Array(/* your classes */)
```
The one tricky bit is if two libraries use the same classes. Maybe we can
keep track of which classes are registered somehow, otherwise Kryo might get
confused.
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