C. Scott Andreas updated CASSANDRA-8433:
    Component/s: Metrics

> Add jmx and nodetool controls to reset lifetime metrics to zero
> ---------------------------------------------------------------
>                 Key: CASSANDRA-8433
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8433
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Metrics
>            Reporter: Donald Smith
>            Priority: Minor
> Often I change some parameter in cassandra, in the OS, or in an external 
> component and want to see the effect on cassandra performance.  Because some 
> the jmx metrics are for the lifetime of the process, it's hard to see the 
> effect of changes.  It's inconvenient to restart all the nodes. And if you 
> restart only some nodes (as I often do) then only those metrics reset to zero.
> The jmx interface should provide a way to reset all lifetime metrics to zero. 
>  And *nodetool* should invoke that to allow resetting metrics from the 
> command line.

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