Hi there,

While rolling deploying SSL changes to get Kafka working over SSL + inter 
broker protocol updated from SASL_PLAINTEXT to SSL, getting like problems to 
publish messages with:

org.apache.kafka.common.errors.NotEnoughReplicasException: Messages are 
rejected since there are fewer in-sync replicas than required..

With configuration:

default.replication.factor=3

min.insync.replicas=2

num.replica.fetchers=1

offsets.topic.replication.factor=3

Expected? I couldn’t say when exactly happened, but for sure having a few nodes 
still pending to release, and a few ones already released (note we have a 
cluster with 5 nodes).

Those messages are retried, or finally lost to publish?

Maybe we could tune up a little bit our broker configuration?

Thanks

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