Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2350
I made one inline comments about moving the `SourceContext` and the
instantiation code.
Also, the problem with the "async exception check" can be solved by
introducing an interface `AsyncExceptionChecker` that is passed to the context.
(I think that's what @rmetzger was hinting at.)
Even better yet, we might be able to get rid of that stuff by using
`task.failExternally()` in all places that previously made these async checks
necessary. (The file read operator already uses that, btw)
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