[jira] [Assigned] (KAFKA-6607) Consumer Client and Kafka Streams lag not zero when input topic transactional

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax reassigned KAFKA-6607:
--------------------------------------

    Assignee: Matthias J. Sax

> Consumer Client and Kafka Streams lag not zero when input topic transactional
> -----------------------------------------------------------------------------
>
>                 Key: KAFKA-6607
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6607
>             Project: Kafka
>          Issue Type: Improvement
>          Components: clients, streams
>    Affects Versions: 1.0.0
>            Reporter: Matthias J. Sax
>            Assignee: Matthias J. Sax
>            Priority: Minor
>
> When an input topic for a Consumer or Kafka Streams application is written using transaction, the client does not commit "endOffset" but "endOffset - 1" (or to be more precise, "lastProcessedMessageOffset + 1") if it reaches the end of topic. The reason is the commit marker that is the last "message" in the topic; Streams commit "offset of last processed message plus 1" and does not take commit markers into account.
> This is not a correctness issue, but when one inspect the consumer lag via {{bin/kafka-consumer.group.sh}} the lag is show as 1 instead of 0 – what is correct from consumer-group tool point of view.



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