Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/742#issuecomment-107751723
Looks good all in all. I am preparing a followup pull request that cleans
up a few things, adds comments, and addresses Marton's comments.
One thing I noticed is that all the non-checkpointed sources have a
checkpoint lock in the signature as well.
Should we offer two source interfaces: `SourceFunction` and
`CheckpointedSourceFunction` ?
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