[jira] [Updated] (KAFKA-5341) Add UnderMinIsrPartitionCount and per-partition UnderMinIsr metrics

["Ewen Cheslack-Postava (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-5341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ewen Cheslack-Postava updated KAFKA-5341:
-----------------------------------------
    Fix Version/s: 1.0.0

> Add UnderMinIsrPartitionCount and per-partition UnderMinIsr metrics
> -------------------------------------------------------------------
>
>                 Key: KAFKA-5341
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5341
>             Project: Kafka
>          Issue Type: New Feature
>            Reporter: Dong Lin
>            Assignee: Dong Lin
>             Fix For: 1.0.0
>
>
> 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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