Github user markhamstra commented on the pull request: https://github.com/apache/spark/pull/6361#issuecomment-116742527 @koertkuipers While it may be convenient for you that Scalding and Spark have a common serialization format when using chill/kryo, that can't be considered anything but a lucky accident. We certainly haven't made guarantees that Spark's serialization will maintain compatibility with some external format. While that doesn't mean that we should gratuitously change Spark's serialization, it does mean that we shouldn't bind ourselves to a particular format if there are compelling reasons to do something other.
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