Re: What is OneMinuteRate in Write Latency?

[Chris Lohfink]

Its from the metrics library Meter

object which tracks the exponentially weighted moving average

of events.

Chris

On Thu, Nov 2, 2017 at 12:10 PM, AI Rumman  wrote:

> Hi,
>
> I am trying to calculate the Read/second and Write/Second in my Cassandra
> 2.1 cluster. After searching and reading, I came to know about JMX bean
> "org.apache.cassandra.metrics:type=ClientRequest,scope=
> Write,name=Latency".
> Here I can see oneMinuteRate. I have started a brand new cluster and
> started collected these metrics from 0.
> When I started my first record, I can see
>
> Count = 1
>> OneMinuteRate = 0.01599111...
>
>
> Does it mean that my write/s is 0.0159911? Or does it mean that based on 1
> minute data, my write latency is 0.01599 where Write Latency refers to the
> response time for writing a record?
>
> Please help me understand the value.
>
> Thanks.
>
>
>
>
>

Re: What is OneMinuteRate in Write Latency?

[Nicolas Guyomar]

Hi,

OneMinuteRate is the mean rate of write/s over a minute bucket of data
AFAIK.

You can find Latencies on every attributes whose name does not end with
"Rate"



On 2 November 2017 at 18:10, AI Rumman  wrote:

> Hi,
>
> I am trying to calculate the Read/second and Write/Second in my Cassandra
> 2.1 cluster. After searching and reading, I came to know about JMX bean
> "org.apache.cassandra.metrics:type=ClientRequest,scope=
> Write,name=Latency".
> Here I can see oneMinuteRate. I have started a brand new cluster and
> started collected these metrics from 0.
> When I started my first record, I can see
>
> Count = 1
>> OneMinuteRate = 0.01599111...
>
>
> Does it mean that my write/s is 0.0159911? Or does it mean that based on 1
> minute data, my write latency is 0.01599 where Write Latency refers to the
> response time for writing a record?
>
> Please help me understand the value.
>
> Thanks.
>
>
>
>
>