[release-2.1][FLINK-38370] Ensure CommitterOperator commits all pending committables in batch mode #27015
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…es in batch mode In apache#26433, we removed the EOI marker in the form of Long.MAX_VALUE as the checkpoint id. Since streaming pipelines can continue to checkpoint even after their respective operators have been shut down, it is not safe to use a constant as this can lead to duplicate commits. However, in batch pipelines we only have one commit on job shutdown. Using any checkpoint id should suffice in this scenario. Any pending committables should be processed by the ComitterOperator when the operator shuts down. No further checkpoints will take place. There are various connectors which rely on this behavior. I don't see any drawbacks from keeping this behavior for batch pipelines.
mxm
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In #26433, we removed the EOI marker in the form of Long.MAX_VALUE as the checkpoint id. Since streaming pipelines can continue to checkpoint even after their respective operators have been shut down, it is not safe to use a constant as this can lead to duplicate commits.
However, in batch pipelines we only have one commit on job shutdown. Using any checkpoint id should suffice in this scenario. Any pending committables should be processed by the ComitterOperator when the operator shuts down. No further checkpoints will take place.
There are various connectors which rely on this behavior. I don't see any drawbacks from keeping this behavior for batch pipelines.
Backport of #27004.