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https://issues.apache.org/jira/browse/KAFKA-5144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15990643#comment-15990643
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Matthias J. Sax commented on KAFKA-5144:
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After digging a little deeper, partition time get's advanced as {{5, 10, 12, 
12, 20, 20}} -- thus the initial example is correct. At the same time, the last 
example is also correct, however, this new partition time (that is ready one 
step ahead) will only be used _after_ the record got processed. Thus, time is 
advanced correctly.

> MinTimestampTracker does not correctly add timestamps lower than the current 
> max
> --------------------------------------------------------------------------------
>
>                 Key: KAFKA-5144
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5144
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.2.1
>            Reporter: Michal Borowiecki
>            Assignee: Michal Borowiecki
>
> When adding elements MinTimestampTracker removes all existing elements 
> greater than the added element.
> Perhaps I've missed something and this is intended behaviour but I can't find 
> any evidence for that in comments or tests.



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