C. Scott Andreas updated CASSANDRA-7402:
    Component/s: Metrics

> Add metrics to track memory used by client requests
> ---------------------------------------------------
>                 Key: CASSANDRA-7402
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7402
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Metrics
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>            Priority: Minor
>              Labels: ops, performance, stability
>             Fix For: 4.x
>         Attachments: 7402.txt
> When running a production cluster one common operational issue is quantifying 
> GC pauses caused by ongoing requests.
> Since different queries return varying amount of data you can easily get your 
> self into a situation where you Stop the world from a couple of bad actors in 
> the system.  Or more likely the aggregate garbage generated on a single node 
> across all in flight requests causes a GC.
> It would be very useful for operators to see how much garbage the system is 
> using to handle in flight mutations and queries. 
> It would also be nice to have either a log of queries which generate the most 
> garbage so operators can track this.  Also a histogram.

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