Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/1668
To suggest some way to fix the guarantees: To my mind, the crux lies in the
way that the feedback channel is implemented - a simple blocking queue just
does not cut it for that case. To make this proper, I think we need to do the
following:
- Have an elastic feedback channel (unbounded) with a certain memory
budget, that can spill if needed. I think it would be best implemented holding
data serialized.
- On checkpoint, one simply adds the feedback channel data (already
bytes) to the checkpoint
- The source task should probably prioritize reading from the feedback
channel, to keep it always as small as possible.
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