Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/9297#issuecomment-152783164
> I was thinking adding a toJson method to the SparkListenerEvent.
I'm not a big fan of allowing events to write custom serialization code. I
think a better approach would be to change `JsonProtocol` to use Jackson when
the event doesn't match any of the currently known event types. Then later we
could add a flag that makes `JsonProtocol` use Jackson for all event types.
Mostly that's for backwards compatibility, so that event that are currently
written to the event log don't change format. We can then document that the old
format is deprecated and will be switched to the new, Jackson-based one in a
future release.
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