I tried a scenario wherein:
1) i had 1 producer and 3 consumers subscribed for a topic - "cartTopic",
all in same group.
2) Now, when everything is executing, i introduced another consumer for the
same topic and in the same group. So, overall there are 4 consumers.
3) Ofcourse, it triggered re-balancing.
But then final result is that few messages are duplicated.
In my example run, producer sent 800,000 records, but consumer received
I am using log4j to generate the output file.
Is there any reasons for duplicacy?