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https://issues.apache.org/jira/browse/KAFKA-8695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexandre Dupriez reassigned KAFKA-8695:
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Assignee: Alexandre Dupriez
> Metrics UnderReplicated and UnderMinSir are diverging when configuration is
> inconsistent
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-8695
> URL: https://issues.apache.org/jira/browse/KAFKA-8695
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 2.1.0, 2.2.0, 2.1.1, 2.3.0
> Reporter: Alexandre Dupriez
> Assignee: Alexandre Dupriez
> Priority: Minor
>
> As of now, Kafka allows the replication factor of a topic and
> "min.insync.replicas" to be set such that "min.insync.replicas" > the topic's
> replication factor.
> As a consequence, the JMX beans
> {code:java}
> kafka.cluster:type=Partition,name=UnderReplicated{code}
> and
> {code:java}
> kafka.cluster:type=Partition,name=UnderMinIsr{code}
> can report diverging views on the replication for a topic. The former can
> report no under replicated partition, while the second will report under
> in-sync replicas.
> Even worse, consumption of topics which exhibit this behaviour seems to fail,
> the Kafka broker throwing a NotEnoughReplicasException.
> {code:java}
> [2019-07-22 10:44:29,913] ERROR [ReplicaManager broker=0] Error processing
> append operation on partition __consumer_offsets-0
> (kafka.server.ReplicaManager)
> org.apache.kafka.common.errors.NotEnoughReplicasException: The size of the
> current ISR Set(0) is insufficient to satisfy the min.isr requirement of 2
> for partition __consumer_offsets-0 {code}
> In order to avoid this scenario, one possibility would be to check the values
> of "min.insync.replicas" and "default.replication.factor" when the broker
> starts, and "min.insync.replicas" and the replication factor given to a topic
> at creation time, and refuses to create the topic if those are inconsistently
> set.
>
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