Hi,
If you have a large number of partitions in your topic, it can take a really 
long while before you start seeing messages on the console.

So, using the partition id is the right approach. But just need to be patient 
at the command-line. Out of interest, how long did you wait for the output from 
console consumer ?

If you need to know the partition id, you will need to use a custom program to 
compute it based on the key. (You could have a look at the murmur2 source code 
on the Kafka github repository and try to create a simple command line tool to 
compute the partition id using the key).

However, using --group option will only set the consumer group id of your 
instance of the kafka-console-consumer.sh.

Regards,
Neeraj
     On Tuesday, 13 June, 2023 at 05:26:24 pm GMT+10, Geithner, Wolfgang Dr. 
<w.geith...@gsi.de> wrote:  
 
 This is a copy of a topic I posted in stackoverflow 
(https://stackoverflow.com/questions/76458064/apache-kafka-consumer-consumes-messages-with-partition-option-but-not-with-g),
 where I didn't get any answer yet. Searching the web did not yield any helpful 
reults either. Hence, I am addressing to this mailing list:

I am running a plain Apache Kafka server (version 3.4.1) which I would like to 
connect to a Telegraf consumer. The Telegraf ```[[inputs.kafka_consumer]]``` 
plugin has the option to consume by Kafka "group". When staring Telegraf, I get 
an error message

    [inputs.kafka_consumer] Error in plugin: consume: kafka server: Request was 
for a consumer group that is not coordinated by this broker

Hence, I started to investigate my setup by using the Kafka console tools and 
found that when executing

    ./kafka-console-consumer.sh --bootstrap-server myserver:9092 --topic test 
--partition 0

and sending messages via ```kafka-console-consumer.sh```, these messages pop up 
in the console "consumer" window as expected.

In contrast to this, when I run

    ./kafka-console-consumer.sh --bootstrap-server myserver:9092 --topic test 
--group my-group

nothing happens in the "consumer" window. Furthermore, the command

    ./kafka-consumer-groups.sh --bootstrap-server myserver:9092 --list

yields nothing.

What do I have to do to cause the consumer with the "group" option to "see" the 
messages produced to the topic "test"? Ultimately, how can I solve the Telegraf 
error?
  

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