[jira] [Work started] (KAFKA-2588) ReplicaManager partitionCount metric should actually be replicaCount

["Grant Henke (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-2588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on KAFKA-2588 started by Grant Henke.
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> ReplicaManager partitionCount metric should actually be replicaCount
> --------------------------------------------------------------------
>
>                 Key: KAFKA-2588
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2588
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8.2.1
>            Reporter: Grant Henke
>            Assignee: Grant Henke
>
> The metrics "partitionCount" in the ReplicaManager actually represents the count of replicas. 
> As an example if I have a cluster with 1 topic with 1 partitions and a replication factor of 3. The metric (aggregated) would show a value of 3. 
> There is a metric called "LeaderCount" that actually represents the "partitionCount". In my example above the metric (aggregated) would show a value of 1. 
> We do need to consider compatibility of consuming systems. I think the most simple change would be to:
> - Adjust the "partitionCount" metric to be the same value as "LeaderCount"
> - Add a "replicaCount" metric which contains the values "partitionCount" does today
> - Leave "LeaderCount" in for compatibility
> Documentation will need to be updated as well. 



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