Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2432#issuecomment-57553670
Hey @sarutak,
After some discussion, we'd like to hold off on changing ApplicationId from
a String to a class. Our rationale is that identifiers should be exposed as
primitive types since they don't really have any structure to them and this
makes them easier to consume from other languages without having to write
wrapper classes there, too. Of course, we can always use richer types inside
of Spark itself (e.g. wrapper classes that extend AnyVal).
Do you mind reverting the `String -> ApplicationId` changes and removing
that class? Sorry about this; I know that it might be a big pain.
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