Github user mwws commented on the pull request:
https://github.com/apache/spark/pull/11753#issuecomment-197636762
I considered just updating error message, but checkpoint is not the only
case for this kind of exception. For example, registering new DStream after scc
started could also cause the same exception, etc. And I am not sure enumerate
all the possible cases in doc is a good idea?
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