Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/3035
Regarding some of your notes:
- The exposure of the checkpoint lock through `SourceContext` is meant for
sources to atomically update their state (e.x. Kafka offsets) with record
emitting, with regards to Flink's checkpointing mechanics for exactly once.
- I don't think there has been any solid discussion on migrating to Java 8
yet.
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