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From Nick Bailey <>
Subject Re: How often are JMX Cassandra metrics reset?
Date Thu, 28 Aug 2014 20:49:31 GMT
Those percentile values should be for the lifetime of the node yes.
Depending on what version of OpsCenter you are using it is either using the
'recent' metrics described by Rob, or it is using the FiveMinuteRate from
JMX as well as doing some of it's own aggregation depending on the rollup

On Thu, Aug 28, 2014 at 12:36 PM, Robert Coli <> wrote:

> 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...
> =Rob

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