Hi ,

I wanted to understand the process for production upgrade of Kafka. As
documented in the https://kafka.apache.org/documentation/#upgrade, it
should be seamless.

I had a 3 node cluster(single topic, partitions=60, replication factor =2
)on which i was trying the same.
As suggested, I first stopped first broker, did the property
changes(inter.broker.protocol.version , log.message.format.version to
10.2.1) with 11 downloaded package and restarted it. It was rebuilding
index and it took quite a bit of time.

Thereafter, when I started another node with same steps, it failed. The
partitions went offline. It seemed to me now the requirement for 2 Kafka10
nodes was not met, perhaps it wasnt able to recognize newly updated nodes.

Regards,
-Sameer.

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