Details
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New Feature
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Status: Resolved
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Major
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Resolution: Fixed
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Description
We currently have under replicated partitions, but we do not have a metric to track the number of partitions whose in-sync replicas count < minIsr. Partitions whose in-syn replicas count < minIsr will be unavailable to those producers who uses ack = all. It is important for Kafka operators to be notified of the existence of such partition because their existence reduces the availability of the Kafka service.
More specifically, we can define a per-broker metric UnderMinIsrPartitionCount as "The number of partitions that this broker leads for which in-sync replicas count < minIsr." So if the RF was 3, and min ISR is 2, then when there are 2 replicas in ISR this partition would be in the under replicated partitions count. When there is 1 replica in ISR, this partition would also be in the UnderMinIsrPartitionCount.
See https://cwiki.apache.org/confluence/display/KAFKA/KIP-164-+Add+UnderMinIsrPartitionCount+and+per-partition+UnderMinIsr+metrics for more detail.
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