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From Antonio Rocco IORFINO <antoniorocco.iorf...@alten.ch>
Subject Consumer Group got stuck in PreparingRebalance
Date Fri, 17 Apr 2020 13:56:09 GMT
Hi All,

I have a problem with the latest kafka release (2.4.0).
Some consumer after few days running  (2-3 days usually) have a problem to consume data, It
does not receive any record. The consumer from client side seems to be active but inside the
broker I can see that the consumer group is stuck in state PreparingRebalance.
In the consumer group I can see two or more members one of which has all topics and partitions
assigned. The problem is that this member it seems not be real (Member ID: (unassigned), Client
ID: -, Hostname: -).
The other member related to my real client (with correct Member ID, Client ID, Hostname) have
no topics and partitions assigned.

This problem is resolved only with a broker restart, any other test like restart the consumer
does not allow to consume again the data anymore.
If I try to verify the status of the consumer group by command line the result is always the
same (rebalancing).

Anyone has an idea?


Antonio R. Iorfino
IT Consultant
Riedstrasse 11, 6330 Cham

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