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https://issues.apache.org/jira/browse/KAFKA-5341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dong Lin updated KAFKA-5341:
----------------------------
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.
was:We currently have under replicated partitions, but we do not have a
metrics for unavailable partitions. Unavailable partitions could be most easily
defined as “The number of partitions that this broker leads for which the ISR
is insufficient to meet the minimum ISR required.” 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 unavailable partitions count.
> 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
>
> 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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