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Posted to user@cassandra.apache.org by Robert <ca...@spamgourmet.com> on 2010/11/11 21:53:44 UTC

what does "recent" mean for Recent*LatencyMicros?

I'm looking at

 * RecentRangeLatencyMicros
 * RecentReadLatencyMicros
 * RecentWriteLatencyMicros

on http://wiki.apache.org/cassandra/JmxInterface .  However, it is not clear
(short of looking at the source code) what "recent" means.

Does anybody know?  I've tried running some stuff and querying the JMX MBeans,
but I cannot figure out any discernible pattern.

Thanks.

Re: what does "recent" mean for Recent*LatencyMicros?

Posted by Robert Coli <rc...@digg.com>.

On 11/11/10 1:34 PM, Robert wrote:
> Brandon Williams<driftx<at>  gmail.com>  writes:
>> As the wiki says: "The latency of<type>  operations since the last time this
> attribute was read." 
>
> You mean, the last time any client queried the JMX MBean attribute?
Yes.

=Rob

Re: what does "recent" mean for Recent*LatencyMicros?

Posted by Robert <ca...@spamgourmet.com>.

Brandon Williams <driftx <at> gmail.com> writes:
> As the wiki says: "The latency of <type> operations since the last time this
attribute was read." 

You mean, the last time any client queried the JMX MBean attribute?

Re: what does "recent" mean for Recent*LatencyMicros?

Posted by Brandon Williams <dr...@gmail.com>.

On Thu, Nov 11, 2010 at 2:53 PM, Robert <
cassandra.robertwork@spamgourmet.com> wrote:

> I'm looking at
>
>  * RecentRangeLatencyMicros
>  * RecentReadLatencyMicros
>  * RecentWriteLatencyMicros
>
> on http://wiki.apache.org/cassandra/JmxInterface .  However, it is not
> clear
> (short of looking at the source code) what "recent" means.
>

As the wiki says: "The latency of <type> operations since the last time this
attribute was read."

-Brandon