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From Subhash Sriram <subhash.sri...@gmail.com>
Subject Kafka - Question about kafka-consumer-groups.sh
Date Fri, 05 May 2017 20:43:34 GMT
Hey everyone,

I am a little bit confused about how the kafka-consumer-groups.sh/
ConsumerGroupCommand works, and was hoping someone could shed some light on
this for me.

We are running Kafka, and using the new Consumer API with the
Confluent.Kafka C# library (v0.9.5) that uses librdkafka. Today, I was
trying to get some details on what consumers were running, and their
position within a couple of topics, but when I ran the following, I did not
see the group in the list.

./bin/kafka-consumer-groups.sh --bootstrap-server [our servers]
--new-consumer --list

I see a few groups listed, but none of the ones I was expecting to see. I
saw this in the documentation:

*"When using the new consumer API
<http://kafka.apache.org/documentation.html#newconsumerapi> (where the
broker handles coordination of partition handling and rebalance), the group
is deleted when the last committed offset for that group expires"*

Is that related to log retention time? If so, is it saying that the group
will be deleted from the list once the highest committed offset of its
group is past its configured log retention time?

The issue I am facing is that we have a consumer group that is actively
consuming. At one point, I am sure the messages in the topic it is
consuming expired, but since then, more messages have been added, and it
has been consuming & committing higher offsets. Shouldn't that group have
come back on the list?

Any ideas would be very helpful.


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