kafka.server.ReplicaManager.UnderReplicatedPartitions

The number of under-replicated partitions

Dimensions:None

Technical Annotations (19)

Configuration Parameters (5)

spec.replicasrecommended: minimum 3

minimum viable cluster size with default replication factor

confluent.balancer.replication.in.max.bytes.per.secondrecommended: >= (RF-1) * confluent.balancer.producer.in.max.bytes.per.second

must account for ISR replication traffic based on replication factor

replica.fetch.max.bytesrecommended: >= message.max.bytes

Must be at least as large as message.max.bytes to prevent replication issues

message.max.bytesrecommended: 1048576 (1MB default)

Maximum message size broker accepts

min.insync.replicasrecommended: 2

With replication.factor=3 and acks=all ensures majority quorum

Error Signatures (2)

NotEnoughReplicasexception

NotEnoughReplicasAfterAppendexception

CLI Commands (1)

kubectl scale kafka <Kafka-CR-name> --replicas=Nremediation

Technical References (11)

in-sync replicasconceptconsumer groupcomponentISR churnconceptpage cache hit ratioconceptISRconceptConfluent Control Centercomponentpartition reassignmentconceptunder-replicated partitionsconceptreplicaconceptreplication factorconceptminIsrcomponent

Related Insights (12)

Negative out-of-sync replica count after broker recoveryinfo

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Under-replicated partitions indicate data loss risk on broker failurecritical

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ISR shrinkage progresses silently until data loss occurscritical

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Consumer lag escalates rapidly while broker health metrics remain normalcritical

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Missing monitoring of ISR shrinks and consumer lag delays incident responsewarning

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Scaling below 3 replicas violates default replication factorcritical

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Replication inbound throttle insufficient for replication factor causes ISR issueswarning

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Broker removal in pre-7.0 versions causes under-replicated partitionscritical

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Under-replicated partitions indicate data durability riskwarning

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Replication failures when replica fetch limit smaller than message limitcritical

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Producer writes fail when in-sync replicas drop below minimum thresholdcritical

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Partitions fall below minimum in-sync replica countcritical

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