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From "Donald Smith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8433) Add jmx and nodetool controls to reset lifetime metrics to zero
Date Mon, 08 Dec 2014 16:31:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238029#comment-14238029
] 

Donald Smith commented on CASSANDRA-8433:
-----------------------------------------

Maybe I could use the 'recent' metrtics if I knew which ones were 'lifetime' and which ones
were 'recent'.   Also, how often do the 'recent' metrics reset?  It doesn't seem to say here:
http://wiki.apache.org/cassandra/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
>            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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