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From rohit bhatia <rohit2...@gmail.com>
Subject Re: Memory Usage of a connection
Date Fri, 31 Aug 2012 05:35:13 GMT
PS: everything above is in bytes, not bits.

On Fri, Aug 31, 2012 at 11:03 AM, rohit bhatia <rohit2412@gmail.com> wrote:

> I was wondering how much would be the memory usage of an established
> connection in cassandra's heap space.
>
> We are noticing extremely frequent young generation garbage collections
> (3.2gb young generation, ParNew gc every 2 seconds) at a traffic of
> 20,000qps for 8 nodes.
> We do connection pooling but with 1 connection for 6 requests with
> phpcassa.
> So, essentially every node has on an average 500 connections
> created/destroyed every second.
> Could these 500 connections/second cause (on average) 2600Mb memory usage
> per 2 second ~ 1300Mb/second.
> or For 1 connection around 2-3Mb.
>
> Is this value expected? (our write requests are simple counter increments
> and cannot take up 500KB per request as calculation suggests, rather should
> take up only a few hundred bytes).
>
> Thanks
> Rohit
>

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