Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/4216#issuecomment-71938252
If you guys have concerns about the protocol, you should comment on it or
on the JIRA; the protocol was posted 5 days ago. Really what matters for this
release is *defining* a protocol (such that future versions can implement the
spec here). It's useful to put this in 1.3 to prevent the lock-in to Akka
versions from extending longer. Basically any protocol that depends on Akka
today will definitely be broken in future versions, it's just an accident that
it hasn't been yet, so it's best give spark-submit a way to submit to future
versions of Spark before that so that as many users as possible can use new
versions.
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