Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/19520
IMO non-URL friendly IDs (such as those containing slashes) also are not
very user-friendly. So yes, this is a no-op for any case that we care about,
but it's exposing what I consider a usability issue in some scheduler backend
that has expressed interest in being added to Spark at some point.
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