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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: How to measure the write amplification of C*?
Date Thu, 10 Mar 2016 11:42:30 GMT
Hi Dikang,

I am not sure about what you call "amplification", but as sizes highly
depends on the structure I think I would probably give it a try using CCM (
https://github.com/pcmanus/ccm) or some test cluster with 'production like'
setting and schema. You can write a row, flush it and see how big is the
data cluster-wide / per node.

Hope this will be of some help.

C*heers,
-----------------------
Alain Rodriguez - alain@thelastpickle.com
France

The Last Pickle - Apache Cassandra Consulting
http://www.thelastpickle.com

2016-03-10 7:18 GMT+01:00 Dikang Gu <dikang85@gmail.com>:

> Hello there,
>
> I'm wondering is there a good way to measure the write amplification of
> Cassandra?
>
> I'm thinking it could be calculated by (size of mutations written to the
> node)/(number of bytes written to the disk).
>
> Do we already have the metrics of "size of mutations written to the node"?
> I did not find it in jmx metrics.
>
> Thanks
>
> --
> Dikang
>
>

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