Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/742#issuecomment-108618014
I generally like that idea. Especially the extensibility with respect to
timestamps and watermark generation is a good point.
Retrieving the lock object from the context is not very obvious, but then
again, someone who implements a fault tolerant exactly-once source should ready
the javadocs and have a look at an example.
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