Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/8998#issuecomment-146017855
As I said, I don't mind either. But in this case, we need to be
conservative. We can additional checks to see if WAL is enabled, but it is not
possible to actually check what DStreams are being used (it could be a custom
one, which does not break if executors go away), so that case still exists.
How about we print the config param out or document it in that case?
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