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From Redmumba <redmu...@gmail.com>
Subject Re: What does the "rate" signify for latency in the JMX Metrics?
Date Fri, 16 May 2014 16:01:30 GMT
Unfortunately, I found the documentation to be very lackluster.  However, I
have actually begun to use the Yammer Metrics library in other projects, so
I have a much better understanding of what it generates.  Thank you for the
response!

(also, for some strange reason, I am just getting the email now, on 5/16,
even though it says you replied 5/7--weird)

Andrew


On Wed, May 7, 2014 at 11:00 AM, Chris Burroughs
<chris.burroughs@gmail.com>wrote:

> They are exponential decaying moving averages (like Unix load averages) of
> the number of events per unit of time.
>
> http://wiki.apache.org/cassandra/Metrics might help
>
>
> On 04/17/2014 06:06 PM, Redmumba wrote:
>
>> Good afternoon,
>>
>> I'm attempting to integrate the metrics generated via JMX into our
>> internal
>> framework; however, the information for several of the metrics includes a
>> One/Five/Fifteen-minute "rate", with the RateUnit in "SECONDS".  For
>> example:
>>
>> $>get -b
>>
>>> org.apache.cassandra.metrics:name=Latency,scope=Write,type=ClientRequest
>>> *
>>> #mbean =
>>> org.apache.cassandra.metrics:name=Latency,scope=Write,type=
>>> ClientRequest:
>>> LatencyUnit = MICROSECONDS;
>>>
>>> EventType = calls;
>>>
>>> RateUnit = SECONDS;
>>>
>>> MeanRate = 383.6944837362387;
>>>
>>> FifteenMinuteRate = 868.8420188648543;
>>>
>>> FiveMinuteRate = 817.5239450236011;
>>>
>>> OneMinuteRate = 675.7673129014964;
>>>
>>> Max = 498867.0;
>>>
>>> Count = 31257426;
>>>
>>> Min = 52.0;
>>>
>>> 50thPercentile = 926.0;
>>>
>>> Mean = 1063.114029159023;
>>>
>>> StdDev = 1638.1542477604232;
>>>
>>> 75thPercentile = 1064.75;
>>>
>>> 95thPercentile = 1304.55;
>>>
>>> 98thPercentile = 1504.3999999999992;
>>>
>>> 99thPercentile = 2307.3500000000104;
>>>
>>> 999thPercentile = 10491.850000000002;
>>>
>>>
>> What does the rate signify in this context?  For example, given the
>> OneMinuteRate of  675.7673129014964 and the unit of "seconds"--what is
>> this
>> measuring?  Is this the rate of which metrics are submitted? i.e., there
>> were an average of (676 * 60 seconds) metrics submitted over the last
>> minute?
>>
>> Thanks!
>>
>>
>

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