[jira] [Created] (FLINK-19680) Add CheckpointBarrierAnnouncement priority message

[Shang Yuanchun (Jira)]

Piotr Nowojski created FLINK-19680:
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             Summary: Add CheckpointBarrierAnnouncement priority message
                 Key: FLINK-19680
                 URL: https://issues.apache.org/jira/browse/FLINK-19680
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Checkpointing
    Affects Versions: 1.12.0
            Reporter: Piotr Nowojski
            Assignee: Piotr Nowojski
             Fix For: 1.12.0


When an aligned checkpoint barrier arrives in an input channel, we should enqueue at the head of the queue priority event, announcing arrival of the checkpoint barrier.

Such announcement event should be propagated to the `CheckpointBarrierHandler`. Based on that, `CheckpointBarrierHandler` will be able to implement logic of time outing from aligned checkpoint to unaligned checkpoint.



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