As a follow-up to my earlier post, I've done a lot of work today to
get my code to properly do exponential back-off, as well as wait 30
seconds between migrating message feeds.

I even break up individual batch feeds into no more than 15 messages
(250KB) or so, and get these 503 errors for almost every other message
in the feed (when I parse the results that I get back).

It's very confusing that only *some* messages in the feed generate
those 503 errors.  It's ridiculous that I can't migrate a few MB of
mail without it failing.

At this point, this will likely hold up our entire organization's move
to Google since we can't help our students move their mail.


On Jun 26, 6:50 am, Patrick <[EMAIL PROTECTED]> wrote:
> My organization (an .edu) is planning to let our population opt-in to
> Google during the beginning of our transition. We have a large
> population we’re planning to move within 2 weeks (probably 5000-10000)
> users each with no more than 50MB mailboxes each (more realistically,
> an average of 20 MB or so each).
>
> Part of the transition is for users to choose if they want mail
> migration or not.  If they do, we have a back-end process that runs
> and migrates their mailbox (using the Mail Migration API).
>
> The migration is performed using the Google domain admin account, and
> we’re planning on a few concurrent processes to be running from one
> server (1 IP address).
>
> When a “503” (server busy) error is received for a message in one of
> the feeds, we’re planning to program in an exponential back-off
> routine (e.g., wait 30 seconds, then 60 seconds…).
>
> However, the Google Mail Migration API documentation isn’t very clear
> on the volume of mail that would generate such an error, nor what
> factors could cause it.
>
> If we have 5 concurrent migrations happening from 1 IP address, is
> that going to increase the odds of getting that “503” error?  If so,
> this could drastically affect our strategy for moving our population
> to Google.  And if so, is there the possibility that we could contact
> Google and ask for some restrictions to be either lifted or altered
> for our IP addresses for a period of time?
>
> Thanks!
> Patrick
>
> On Jun 25, 10:23 am, "Julian (Google)" <[EMAIL PROTECTED]> wrote:
>
>
>
> > Hi,
>
> > You may be getting the error because you are posting emails too fast,
> > please try to slow down the migration and let me know if the problem
> > persists.
>
> > Thanks,
> > Julian
>
> > On Jun 24, 10:51 am, Bam <[EMAIL PROTECTED]> wrote:
>
> > > Hi All,
>
> > > I have a problem when to use Email Migration API with .NET Client
> > > Library.
>
> > > Not all message can be posted correctly to gmail.
>
> > > i get response.
>
> > > "The server is currently busy and could not complete your request.
> > > Please try again in 30 seconds.#503"
>
> > > How to ignore or resolved this problem??
>
> > > Thanks,- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
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