rkhachatryan commented on a change in pull request #14057:
URL: https://github.com/apache/flink/pull/14057#discussion_r540428875
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File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/io/AlternatingController.java
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@@ -114,6 +114,7 @@ public void barrierAnnouncement(
lastSeenBarrier = barrier.getId();
firstBarrierArrivalTime = getArrivalTime(barrier);
}
+ activeController = chooseController(barrier);
Review comment:
Consider a checkpoint with two barriers from two channels: UC and AC:
1. Process AC announcement. Set
`SingleCheckpointBarrierHandler.currentCheckpointId`. Don't timeout.
2. Process UC barrier (no announcements). Because `currentCheckpointId` was
set `checkSubsumedCheckpoint` does nothing, i.e.
`preProcessFirstBarrierOrAnnouncement` not called and controller so
`activeController` == AC
3. Further process (UC) barrier - now AC controller is processing UC barrier
> (as in other places: a unit test would be helpful)
I agree, will add it.
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