Re: Twitter over capacity

[David Farber <dave () farber net>]

Begin forwarded message:

From: Lee Revell <rlrevell () joe-job com>
Date: April 24, 2009 3:39:12 AM EDT
To: dave () farber net
Cc: ip <ip () v2 listbox com>, drallison () gmail com, ip () sanction net, kenneth_mayer () dell com
Subject: Re: [IP] Re: Twitter over capacity

Of course it can be done.  But that kind of high availability doesn't
come cheap.  The designers of Twitter couldn't have known at the time
that their system would quickly become so important to so many.  I
think that for a tech startup with an unproven product, to engineer to
that kind of SLA from day one would probably not be considered a wise
use of capital by most investors.

And in my experience at least, cutting over from that initial system
to the shiny new highly-available one is really, really hard to do
with no downtime.

Lee

On Tue, Apr 21, 2009 at 8:22 AM, David Farber <dave () farber net> wrote:
> Telephone and other systems are deigned to be maintained while the  
> system is
> running. I helped many years ago with the ESS system to enable it to  
> do tht.
> There are lots of systems which are non stop.
>
> djf
>
>
> Begin forwarded message:
>
> From: Lee Revell <rlrevell () joe-job com>
> Date: April 20, 2009 12:20:38 PM EDT
> To: dave () farber net
> Cc: ip <ip () v2 listbox com>
> Subject: Re: [IP] Twitter over capacity
>
> Is there any good time to do maintenance on a worldwide service?  I'd
> love to hear what it is...
>
> Lee
>
> On Mon, Apr 20, 2009 at 10:29 AM, David Farber <dave () farber net>  
> wrote:
> > SUNDAY AT 7 PM?? DJF
> >
> >
> > Begin forwarded message:
> >
> > From: Robert Alberti <ip () sanction net>
> > Date: April 20, 2009 8:02:03 AM EDT
> > To: dave () farber net, drallison () gmail com
> > Cc: ip <ip () v2 listbox com>
> > Subject: Re: [IP] Twitter over capacity
> > Reply-To: alberti () sanction net
> >
> > To be fair, you were doing this on a Sunday night, which is typically
> > when data centers undertake their maintenance processes. They may  
> > have
> > been running on a skeleton system during updates.
> >
> > On Sun, 2009-04-19 at 20:07 -0400, David Farber wrote:
> > > Begin forwarded message:
> > >
> > > From: Dennis Allison <drallison () gmail com>
> > > Date: April 19, 2009 7:47:41 PM EDT
> > > To: Dave Farber <dave () farber net>
> > > Subject: Twitter over capacity
> > >
> > >
> > > For IP if you wish.
> > >
> > > Just tried to tweet and got a diagnostic saying twitter.com was over
> > > capacity.  There is a mess there somewhere about scaling and  
> > > capacity
> > > in the face of sudden popularity.
> > >
> > >
> > >
> > >
> > >
> > > ______________________________________________________________________
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