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From Philippe <watche...@gmail.com>
Subject Re: reads/s suddenly dropped
Date Sun, 19 Feb 2012 17:10:24 GMT
Perhaps your dataset can no longer be held in memory. Check iostats
Le 19 févr. 2012 11:24, "Franc Carter" <franc.carter@sirca.org.au> a écrit :

>
> I've been testing Cassandra - primarily looking at reads/second for our
> fairly data model - one unique key with a row of columns that we always
> request. I've now setup the cluster with with m1.large (2 cpus 8GB)
>
> I had loaded a months worth of data in and was doing random requests as a
> torture test - and getting very nice results. I then loaded another days
> worth of day and repeated the tests while the load was running - still good.
>
> I then started loading more days and at some point the performance dropped
> by close to an order of magnitude ;-(
>
> Any ideas on what to look for ?
>
> thanks
>
> --
>
> *Franc Carter* | Systems architect | Sirca Ltd
>  <marc.zianideferranti@sirca.org.au>
>
> franc.carter@sirca.org.au | www.sirca.org.au
>
> Tel: +61 2 9236 9118
>
> Level 9, 80 Clarence St, Sydney NSW 2000
>
> PO Box H58, Australia Square, Sydney NSW 1215
>
>

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