When will the scheduled maintenance start?

[Waleed Abdulla]

It was supposed to start at 1pm. I wonder if it's already in progress or not started yet! 

[App Engine Team]

Hey Waleed

The first half of the maintenance period was actually done without
going read-only. We have just enabled read-only now.

[Waleed Abdulla]

Thanks for the info. 

I updated my app to detect the read-only mode per Jason's presentation[1]. However, now that it's in read-only mode, my app is not detecting it. So the preparations I coded are not working and things are failing badly rather than gracefully :(

This is the code I'm using:

        datastore_writes = capabilities.CapabilitySet('datastore_v3', capabilities=['write'])

        datastore_writes_enabled = \

            datastore_writes.will_remain_enabled_for(60)

I'm expecting to have datastore_writes_enabled be False when in read-only mode, but it's not !!

Waleed

[1] http://www.slideshare.net/jasonacooper/strategies-for-maintaining-app-engine-availability-during-read-only-periods

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[App Engine Team]

Hmm, okay we're looking into what's going on.

On Jun 12, 2:23 pm, Waleed Abdulla <wal...@ninua.com> wrote:
> Thanks for the info.
>
> I updated my app to detect the read-only mode per Jason's presentation[1].
> However, now that it's in read-only mode, my app is not detecting it. So the
> preparations I coded are not working and things are failing badly rather
> than gracefully :(
>
> This is the code I'm using:
>
>         datastore_writes = capabilities.CapabilitySet('datastore_v3',
> capabilities=['write'])
>         datastore_writes_enabled = \
>             datastore_writes.will_remain_enabled_for(60)
>
> I'm expecting to have datastore_writes_enabled be False when in read-only
> mode, but it's not !!
>
> Waleed

> [1]http://www.slideshare.net/jasonacooper/strategies-for-maintaining-app...

>
> On Sat, Jun 12, 2010 at 2:12 PM, App Engine Team <
>

> appengine.nore...@gmail.com> wrote:
> > Hey Waleed
>
> > The first half of the maintenance period was actually done without
> > going read-only. We have just enabled read-only now.
>
> > On Jun 12, 1:49 pm, Waleed Abdulla <wal...@ninua.com> wrote:
> > > It was supposed to start at 1pm. I wonder if it's already in progress or
> > not
> > > started yet!
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "Google App Engine" group.
> > To post to this group, send email to google-a...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > google-appengi...@googlegroups.com<google-appengine%2Bunsu...@googlegroups.com>
> > .

[Waleed Abdulla]

Thank you. And for completeness sake, here is the full function I'm using, just in case something else is wrong. Rather than calling the capabilities APIs on every hit, I cache the value in a global variable and check every 30 seconds. 

from google.appengine.api import capabilities

# Store in a global variable so it's cached between requests.

capabilities_check_time = None;

datastore_writes_enabled = True;

def in_read_only_mode():

    """We return True if we're in read-only mode or going to read-only one in 

       30 seconds or less. But we check the APIs every once in a while to avoid

       the extra load that causes."""

    global capabilities_check_time, datastore_writes_enabled

    buffer_in_seconds = 30  # consider us in read-only mode this much time before we actually get there

    check_period_in_seconds = 30   # time between checking the capabilities APIs

    now = datetime.datetime.now()

    if capabilities_check_time and capabilities_check_time > now:

        # we don't need to check the APIs we have enough info cached

        return not(datastore_writes_enabled)

    else:

        # we need to check the capabilities 

        # todo: check we check memcache as well?

        datastore_writes = capabilities.CapabilitySet('datastore_v3', capabilities=['write'])

        datastore_writes_enabled = \

            datastore_writes.will_remain_enabled_for(buffer_in_seconds + check_period_in_seconds)

        capabilities_check_time = now + datetime.timedelta(seconds=check_period_in_seconds)

        return not(datastore_writes_enabled)

        

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[Amir Michail]

On Jun 12, 5:12 pm, App Engine Team <appengine.nore...@gmail.com>
wrote:

> Hey Waleed
>
> The first half of the maintenance period was actually done without
> going read-only. We have just enabled read-only now.

Do you know approximately when the maintenance period will end?

Amir

[App Engine Team]

Amir - We should be back in the next twenty minutes.

Waleed - I'm so sorry, I think the issue is on our side, but our hands
are tied at the moment with other things happening in the maintenance.

[App Engine Team]

The datastore should now be back. Please let me know if you're still
seeing issues.

On Jun 12, 2:44 pm, App Engine Team <appengine.nore...@gmail.com>