[jira] [Created] (KAFKA-14042) OffsetSyncStore.translateDownstream() should be compatible with the scenario where no msgs are sync-ing while consumer group offsets are sync-ing

["Justinwins (Jira)" <ji...@apache.org>]

Justinwins created KAFKA-14042:
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             Summary: OffsetSyncStore.translateDownstream() should be compatible with the scenario where no msgs are sync-ing while consumer group offsets are sync-ing
                 Key: KAFKA-14042
                 URL: https://issues.apache.org/jira/browse/KAFKA-14042
             Project: Kafka
          Issue Type: Bug
            Reporter: Justinwins
         Attachments: image-2022-07-04-11-20-40-286.png

Let's say, no msgs in source topic parititon (A-0) because of short ttl ,but there are still 
offsets committed by consumers subscribing A-0. At this time ,we set up mm2, and it begins to 
sync A-0 and the according consumer group ,too. Then we will find it hard to understand that:
even though there are no msgs beging synced for real , consumer group offsets are still beging
synced to target cluster ,which would producing lag <0 in target cluster for A-0.

 

!image-2022-07-04-11-20-40-286.png!



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