John Roesler created KAFKA-9562:
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             Summary: Streams not making progress under heavy failures with EOS 
enabled on 2.5 branch
                 Key: KAFKA-9562
                 URL: https://issues.apache.org/jira/browse/KAFKA-9562
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 2.5.0
            Reporter: John Roesler
            Assignee: Boyang Chen
             Fix For: 2.5.0


During soak testing in preparation for the 2.5.0 release, we have discovered a 
case in which Streams appears to stop making progress. Specifically, this is a 
failure-resilience test in which we inject network faults separating the 
instances from the brokers roughly every twenty minutes.

On 2.4, Streams would obviously spend a lot of time rebalancing under this 
scenario, but would still make progress. However, on the current 2.5 branch, 
Streams effectively stops making progress except rarely.

This appears to be a severe regression, so I'm filing this ticket as a 2.5.0 
release blocker.



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