EronWright commented on issue #6980: [FLINK-5697] [kinesis] Add periodic per-shard watermark support URL: https://github.com/apache/flink/pull/6980#issuecomment-435202809 There is a caveat with this implementation that the docs should perhaps mention. The caveat is that it may produce spurious late events when processing a backlog of data. Here's an example of when that may occur. Imagine that subtask 1 is processing shard A and subtask 2 is processing shard B. Shard A has reached 6:00 in event time (as per the assigner), and so the subtask emits the corresponding watermark. At this point, the subtask has made the irrevocable assertion that subsequent events will be past 6:00. Meanwhile, Shard B is at 5:30 and undergoes a split into C/D. If either shard is subsequently assigned to subtask 1, the events will be considered late due to the assertion made earlier.
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