Edward Capriolo commented on CASSANDRA-12649:

+1 (non binding) users with unpredictable batch sizes tend to also have gc 
problems and this would aid in insight.

> Add BATCH metrics
> -----------------
>                 Key: CASSANDRA-12649
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12649
>             Project: Cassandra
>          Issue Type: Wish
>            Reporter: Alwyn Davis
>            Priority: Minor
>             Fix For: 3.x
>         Attachments: trunk-12649.txt
> To identify causes of load on a cluster, it would be useful to have some 
> additional metrics:
> * *Mutation size distribution:* I believe this would be relevant when 
> tracking the performance of unlogged batches.
> * *Logged / Unlogged Partitions per batch distribution:* This would also give 
> a count of batch types processed. Multiple distinct tables in batch would 
> just be considered as separate partitions.

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