Github user jegonzal commented on the pull request:
https://github.com/apache/spark/pull/724#issuecomment-42793347
My only concern is that I would prefer things work slowly than fail. With
reference tracking disabled it is not possible to serialize user defined types
from the spark-shell.
A second concern is that it will be difficult for the user to enable
reference tracking if we disable it in the GraphX Kryo registrar.
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