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From Sameer Farooqui <cassandral...@gmail.com>
Subject Re: How to find what node a key is on
Date Thu, 24 Mar 2011 00:16:06 GMT
No problems with read performance, just curious about what kind of overhead
was being added b/c we're doing read tests.

If it's easy to figure out where the row is stored, I'd be interested in
trying it. If not, don't worry about it.

- Sameer


On Wed, Mar 23, 2011 at 4:31 PM, aaron morton <aaron@thelastpickle.com>wrote:

> Each row is stored on RF nodes, and your read will be sent to CL number of
> nodes. Messages only take a single hop from the coordinator to each node the
> read is performed on, so the networking overhead varies with the number of
> nodes involved in the request.  There are man factors other than networking
> that influence the speed of a read request.
>
> There are features available to determine which nodes holds replicas for a
> particular key. AFAIK they are not intended for use by clients.
>
> Are you currently having problems with read performance ?
>
> Hope that helps.
> Aaron
>
>
> On 24 Mar 2011, at 11:53, Sameer Farooqui wrote:
>
> Does anybody know if it's possible to find out what node a specific key/row
> lives on?
>
> We have a 30 node cluster and I'm curious how much faster it'll be to read
> data directly from the node that stores the data.
>
> We're using random partitioner, by the way.
>
>
> *Sameer Farooqui
> *Accenture Technology Labs
>
>
>

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