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From Aravind Dongara <adong...@yahoo.com.INVALID>
Subject Group Coordinator stuck on PrepareRebalance state.
Date Thu, 11 Jul 2019 02:42:58 GMT
Our kafka streams application is stuck and continuously emits "(Re-)joining group” log message
every 5 minutes without making any progress.

Kafka-consumer-groups cmd line tool with “—members” option shows lots of stale members,
in addition to expected member-ids shown on log msgs on kafka-streams app and broker logs
that were failing to join).
For some reason these old members didn’t get evicted from members list.  
Looks like this is preventing the GroupCordinator from reaching  “CompletingRebalance”

Restart of Kafka streams app didn’t help either, it just replaced the newer member-ids;
but the old stale member-ids are still present in the members-list.

Is there any way to resolve this without restarting the broker hosting the GroupCoordinator
for this group.

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