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From Robert Coli <>
Subject Re: How often are JMX Cassandra metrics reset?
Date Thu, 28 Aug 2014 17:36:54 GMT
On Thu, Aug 28, 2014 at 9:27 AM, Donald Smith <> wrote:

>  And yet OpsCenter shows graphs with ever-changing metrics that show
> recent performance. Does OpsCenter not get its stats from JMX?

1) Certain JMX endpoints expose "recent" metrics, or at least used to.
These are "recent" as in "since the last time someone polled this endpoint."
2) OpsCenter samples via JMX and then stores metrics in its own
columnfamily. I would not be shocked if it does some minor aggregation as
it does so.

This all said, OpsCenter is not Apache Cassandra software, so the Apache
Cassandra user mailing list may not be the ideal place for it to be
discussed or supported...


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