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From Anthony Molinaro <antho...@alumni.caltech.edu>
Subject Re: Viability of running on EC2
Date Sat, 13 Jun 2009 20:10:44 GMT
And any problems with small memory boxes?  I see some chatter on the
cassandra development list about OOM errors.  Are they more prevalent
on smaller footprint boxes?

Thanks again,

-Anthony

On Sat, Jun 13, 2009 at 11:33:21AM -0500, Jonathan Ellis wrote:
> IMO the biggest downside to running on EC2 is that IO is terrible.  I
> haven't done benchmarks, but anecdotally disk performance in
> particular seems like an order of magnitude slower than you'd get on
> non-virtual disks.  So that is worth investigating before assuming
> that the price/performance on EC2 is what you think it is.
> 
> Other than that, Cassandra is designed to emphasize availability so it
> should work fine in the situations you describe.  Hinted handoff in
> particular will get writes to the right nodes quickly when machines
> come back online.  (However, Cassandra is not yet good at dealing with
> machines becoming permanently dead.)
> 
> Of course if _all_ of some keys' replicas are temporarily partitioned
> off from you you won't be able to read that data until they are
> visible again.
> 
> -Jonathan
> 
> On Sat, Jun 13, 2009 at 11:20 AM, Anthony
> Molinaro<anthonym@alumni.caltech.edu> wrote:
> > Hi,
> >
> >  I was wondering what the viability of running cassandra on ec2 was.
> > I believe that it currently runs on some pretty hefty hardware at
> > facebook, so I'm wondering what the minimum hardware config is
> > (in other words can I run it on a cluster of 2core 4GB machines)?
> > Also, running on Amazon means no multicast, network partitions and
> > machines just disappearing.  How does cassandra deal with these
> > constraints/failures?
> >
> > Thanks for information,
> >
> > -Anthony
> >
> > --
> > ------------------------------------------------------------------------
> > Anthony Molinaro                           <anthonym@alumni.caltech.edu>
> >

-- 
------------------------------------------------------------------------
Anthony Molinaro                           <anthonym@alumni.caltech.edu>

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