Matthias J. Sax created KAFKA-6607:

             Summary: Kafka Streams lag not zero when input topic transactional
                 Key: KAFKA-6607
             Project: Kafka
          Issue Type: Improvement
          Components: streams
    Affects Versions: 1.0.0
            Reporter: Matthias J. Sax

When an input topic for a Kafka Streams application is written using 
transaction, Kafka Streams does not commit "endOffset" but "endOffset - 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/}} the lag is show as 1 instead of 0 – what is 
correct from consumer-group tool point of view.

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