Thanks Nick, that's nice and clear now.

Do you know if there's any upper limit on the frequency with which
logs can be downloaded?

Cheers,

On Apr 16, 2:03 pm, "Nick Johnson (Google)" <nick.john...@google.com>
wrote:
> Hi Peter,
>
> Both are true: We keep 90 days of request logs, but only a fixed amount of
> application logging.
>
> -Nick Johnson
>
>
>
>
>
> On Thu, Apr 15, 2010 at 7:11 PM, peterk <peter.ke...@gmail.com> wrote:
> > Hey Ikai, thanks for the reply.
>
> > Are you sure about the 90 day thing? I was reading a thread here where
> > Nick Johnson suggested it was a fixed buffer size:
>
> >http://groups.google.com/group/google-appengine/browse_thread/thread/...
>
> > In that case, the person asking seemed to be only able to keep 20
> > minutes of log data before old logs started to be overwritten (a busy
> > site I guess!).
>
> > Has something changed? Could you check out what the case actually is?
>
> > If I might, I'd like to request if log related 'quotas' could be
> > exposed and published, and expandable with money if possible! :)
> > They're quite critical to an app I'm trying to plan, and while the
> > current setup seems to be OK for my  needs, the blindness to what's
> > happening under the covers and what might happen going forward is a
> > wee bit disconcerting.
>
> > Cheers,
>
> > On Apr 15, 6:48 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> > > The last time I checked, we guaranteed 90 days of logs regardless of
> > size.
> > > This is subject to change, however. I don't know what size we will set,
> > but
> > > like many of our other products, it'll likely start at a number we think
> > is
> > > reasonable based on overall usage and trend upward.
>
> > > Anything is possible with regards to billed features - we just can't give
> > an
> > > ETA unless it's explicitly stated on the roadmap.
>
> > > On Wed, Apr 14, 2010 at 12:27 PM, peterk <peter.ke...@gmail.com> wrote:
> > > > Reading some previous discussions and things alluded to therein, some
> > > > questions cropped up.
>
> > > > I'm considering an application that quite fundamentally requires
> > > > access to all its request logs.
>
> > > > So I guess I'd be recommended to use appcfg.py to periodically pull
> > > > down the logs and append them to a txt file, or do whatever else I
> > > > need to do to persist them.
>
> > > > In previous discussion I saw Google folks say that logs are stored in
> > > > a circular buffer. Meaning if you had enough requests, they'd
> > > > overwrite older requests. Meaning that if you had enough requests or
> > > > were downloading the logs sufficiently infrequently, you might lose
> > > > logs.
>
> > > > So question number 1: how big is the circular buffer for each
> > > > application?
>
> > > > 2: Changes to that buffer size could detrimentally impact on my
> > > > application if revised downward (silently in particular), so are there
> > > > any guarantees that this buffer size won't be reduced in the future?
>
> > > > 3: Is there any possibility that this buffer could be exposed via the
> > > > quota system so that an app could purchase a larger buffer size if it
> > > > were helpful?
>
> > > > I'm flashing forward to a busy site and somewhat worrying about how
> > > > frequently I'll have to download the logs, and whether it would be
> > > > feasible to download them with a certain frequency anyway (e.g. if the
> > > > log download time is quite long - as I've found it can be). Any
> > > > answers or advice would be very welcome. Thanks!
>
> > > > --
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> > > --
> > > Ikai Lan
> > > Developer Programs Engineer, Google App Enginehttp://
> > googleappengine.blogspot.com|http://twitter.com/app_engine
>
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> --
> Nick Johnson, Developer Programs Engineer, App Engine Google Ireland Ltd. ::
> Registered in Dublin, Ireland, Registration Number: 368047
> Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
> 368047
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