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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12649) Add BATCH metrics
Date Fri, 04 Nov 2016 13:58:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15636401#comment-15636401
] 

Benjamin Lerer commented on CASSANDRA-12649:
--------------------------------------------

I discussed the patch with [~iamaleksey] and we both have some concerns with the performance
impact of measuring the mutation size. Could you provide a benchmark to assess the performance
impact of that measurement?

I am also not fully convinced by the usefullness of Logged / Unlogged Partitions per batch
distribution. Could you explain in more details how it will be usefull for you?

> 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: 12649-3.x.patch, 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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