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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2020/02/12 20:21:00 UTC
[jira] [Updated] (KAFKA-6607) Kafka Streams lag not zero when input
topic transactional
[ https://issues.apache.org/jira/browse/KAFKA-6607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias J. Sax updated KAFKA-6607:
-----------------------------------
Component/s: (was: clients)
> 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: 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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