Alexandre, You are right that this is a problem. There is a JIRA on this from a while back.
https://issues.apache.org/jira/plugins/servlet/mobile#issue/KAFKA-4680 I don’t think anyone is currently working on it right now. -James Sent from my iPhone > On Aug 13, 2019, at 1:17 AM, Alexandre Dupriez <alexandre.dupr...@gmail.com> > wrote: > > Hello all, > > We run into a scenario where we had misconfigured the replication factor > and the minimum in-sync replicas count in such a way that the replication > factor (either default or defined at the topic level) is strictly lower > than the property min.insync.replicas. > > We observed broker metrics reporting UnderReplicatedPartitions = 0 and > UnderMinPartitionIsrCount > 0, and the topic’s partitions were unavailable > for producers (with ack=all) and consumers. > > Since it seems to be impossible in this scenario to ever reach the number > of in-sync replicas, making partitions permanently unavailable, it could be > worth to prevent this misconfiguration to make its way to the broker, e.g. > a check could be added when a topic is created to ensure the replication > factor is greater than or equals to the minimum number of in-sync replicas. > > I may have missed something though. What do you think? > > Thank you, > Alexandre
