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From Chris Burroughs <chris.burrou...@gmail.com>
Subject Re: What does the "rate" signify for latency in the JMX Metrics?
Date Wed, 07 May 2014 18:00:54 GMT
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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