Clément Goubert and everybody,
I analyzed https://stream.wikimedia.org/v2/stream/recentchange and i
have the another results.
Last change (before migration): 2023-03-01T14:00:30
First change (after migration): 2023-03-01T14:02:05
Result: Down time (14:00:31 to 14:02:05) is 94s.
I think that analysis is more authoritative. I think it analyzes based
on something like REQUEST_TIME in PHP.
Dušan Kreheľ
2023-03-01 16:30 GMT+01:00, Clément Goubert <cgoub...@wikimedia.org>:
> Dear Wikitechians,
>
> Dear colleagues,
>
> The switchover process requires a *brief read-only period for all
> Foundation-hosted wikis*, which started at *14:00 UTC on Wednesday March
> 1st*, and lasted *119 seconds*. All our public and private wikis continued
> to be available for reading as usual. Users saw a notification of the
> upcoming maintenance, and anyone still editing was asked to try again in a
> few minutes.
>
> As a side note, with other SREs we have been trying to discern the effect
> of the Switchover in many of the graphs we have to monitor the
> infrastructure in https://grafana.wikimedia.org during Switchover. In many,
> it's impossible to tell the event. The most discernible graph we have is of
> the edit rate, which can be viewed here: Grafana
> <https://grafana-rw.wikimedia.org/d/000000208/edit-count?from=1677673800000&orgId=1&to=1677681000000>.
> Can you spot it? See the attached picture to help:
>
> I am extending thanks to everyone that was also present on IRC, helping out
> in any way that they could. Thanks as well to Community Relations who
> notified communities of the read-only window ahead of time. And thanks to
> everyone that contributed to MultiDC
> <https://wikitech.wikimedia.org/wiki/Performance/Multi-DC_MediaWiki>,
> especially Performance for pushing forward with the last parts of it,
> allowing us to perform this Switchover faster and with more confidence than
> ever before.
>
> If you wanna relive through the Switchover, here's a link to a capture
> of Listen
> to Wikipedia <https://en.wikipedia.org/wiki/Listen_to_Wikipedia> during the
> Switchover: Listen to the Switchover
> <https://drive.google.com/file/d/1jqQUVCq3ksjOM5bKoIfCZ5Zt9RRW1Nl_/view?usp=share_link>
> (spoiler:
> the part with no sounds is the switchover)
>
> A similar event will follow a few weeks later, when we move back to
> Virginia. This is currently scheduled for *Wednesday, April 26th*.
> Thank you,
>
> On Tue, Feb 21, 2023 at 1:55 PM Clément Goubert <cgoub...@wikimedia.org>
> wrote:
>
>> Dear Wikitechians,
>>
>> I would like to remind you that the datacenter switchover will happen on
>> *Wednesday
>> March 1st* starting at *14:00 UTC.*
>>
>> Please refer to the original email for any additional information. As
>> always, you can reach out to me directly or the SRE team in
>> #wikimedia-sre
>> on IRC with any question, or through Phabricator.
>>
>> Thank you,
>>
>> On Tue, Feb 14, 2023 at 1:58 PM Clément Goubert <cgoub...@wikimedia.org>
>> wrote:
>>
>>> Dear Wikitechians,
>>>
>>> On *Wednesday March 1st*, the SRE team will run a planned data center
>>> switchover, moving all wikis from our primary data center in Virginia to
>>> the secondary data center in Texas. This is an important periodic test
>>> of
>>> our tools and procedures, to ensure the wikis will continue to be
>>> available
>>> even in the event of major technical issues in our primary home. It also
>>> gives all our SRE and ops teams a chance to do maintenance and upgrades
>>> on
>>> systems in Virginia that normally run 24 hours a day.
>>>
>>> The switchover process requires a *brief read-only period for all
>>> Foundation-hosted wikis*, which will start at *14:00 UTC on Wednesday
>>> March 1st*, and will last for a few minutes while we execute the
>>> migration as efficiently as possible. All our public and private wikis
>>> will
>>> be continuously available for reading as usual, but no one will be able
>>> to
>>> save edits during the process. Users will see a notification of the
>>> upcoming maintenance, and anyone still editing will be asked to try
>>> again
>>> in a few minutes.
>>>
>>> CommRel has already begun notifying communities of the read-only window.
>>> A similar event will follow a few weeks later, when we move back to
>>> Virginia. This is currently scheduled for *Wednesday, April 26th*.
>>>
>>> If you like, you can follow along on the day in the public
>>> #wikimedia-operations channel on IRC (instructions for joining here
>>> <https://meta.wikimedia.org/wiki/IRC/Instructions>). To report any
>>> issues, you can reach us in #wikimedia-sre on IRC, or file a Phabricator
>>> ticket with the *datacenter-switchover* tag (pre-filled form here
>>> <https://phabricator.wikimedia.org/maniphest/task/edit/form/1/?projects=Datacenter-Switchover&subscribers=Clement_Goubert>);
>>> we'll be monitoring closely for reports of trouble during and after the
>>> switchover. (If you're new to Phab, there's more information at
>>> Phabricator/Help.) The switchover and its preparation are tracked
>>> tracked in Phabricator Task T327920
>>> <https://phabricator.wikimedia.org/T327920>
>>>
>>> On behalf of the SRE team, please excuse the disruption, and our thanks
>>> to everyone in a number of departments who've been involved in planning
>>> this work for the past weeks. Feel free to reply directly to me with any
>>> questions.
>>>
>>> Thank you,
>>>
>>> --
>>> Clément Goubert (they/them)
>>> Senior SRE
>>> Wikimedia Foundation
>>>
>>
>>
>> --
>> Clément Goubert (they/them)
>> Senior SRE
>> Wikimedia Foundation
>>
>
>
> --
> Clément Goubert (they/them)
> Senior SRE
> Wikimedia Foundation
>
COUNT TIME_OF_CHANGE
2 2023-03-01T13:59:43Z
1 2023-03-01T13:59:45Z
12 2023-03-01T13:59:47Z
17 2023-03-01T13:59:48Z
21 2023-03-01T13:59:49Z
44 2023-03-01T13:59:50Z
236 2023-03-01T13:59:51Z
36 2023-03-01T13:59:52Z
24 2023-03-01T13:59:53Z
31 2023-03-01T13:59:54Z
18 2023-03-01T13:59:55Z
22 2023-03-01T13:59:56Z
30 2023-03-01T13:59:57Z
45 2023-03-01T13:59:58Z
43 2023-03-01T13:59:59Z
55 2023-03-01T14:00:00Z
33 2023-03-01T14:00:01Z
35 2023-03-01T14:00:02Z
33 2023-03-01T14:00:03Z
34 2023-03-01T14:00:04Z
42 2023-03-01T14:00:05Z
39 2023-03-01T14:00:06Z
46 2023-03-01T14:00:07Z
46 2023-03-01T14:00:08Z
29 2023-03-01T14:00:09Z
32 2023-03-01T14:00:10Z
20 2023-03-01T14:00:11Z
22 2023-03-01T14:00:12Z
22 2023-03-01T14:00:13Z
20 2023-03-01T14:00:14Z
36 2023-03-01T14:00:15Z
19 2023-03-01T14:00:16Z
28 2023-03-01T14:00:17Z
29 2023-03-01T14:00:18Z
21 2023-03-01T14:00:19Z
13 2023-03-01T14:00:20Z
18 2023-03-01T14:00:21Z
10 2023-03-01T14:00:22Z
12 2023-03-01T14:00:23Z
6 2023-03-01T14:00:24Z
6 2023-03-01T14:00:25Z
37 2023-03-01T14:00:26Z
5 2023-03-01T14:00:27Z
7 2023-03-01T14:00:28Z
1 2023-03-01T14:00:30Z
2 2023-03-01T14:02:05Z
2 2023-03-01T14:02:06Z
2 2023-03-01T14:02:07Z
7 2023-03-01T14:02:08Z
2 2023-03-01T14:02:11Z
2 2023-03-01T14:02:15Z
2 2023-03-01T14:02:20Z
2 2023-03-01T14:02:43Z
1 2023-03-01T14:02:49Z
2 2023-03-01T14:02:52Z
2 2023-03-01T14:03:00Z
5 2023-03-01T14:03:04Z
2 2023-03-01T14:03:05Z
1 2023-03-01T14:03:07Z
13 2023-03-01T14:03:08Z
19 2023-03-01T14:03:09Z
20 2023-03-01T14:03:10Z
38 2023-03-01T14:03:11Z
23 2023-03-01T14:03:12Z
21 2023-03-01T14:03:13Z
21 2023-03-01T14:03:14Z
15 2023-03-01T14:03:15Z
27 2023-03-01T14:03:16Z
19 2023-03-01T14:03:17Z
22 2023-03-01T14:03:18Z
18 2023-03-01T14:03:19Z
18 2023-03-01T14:03:20Z
20 2023-03-01T14:03:21Z
28 2023-03-01T14:03:22Z
23 2023-03-01T14:03:23Z
20 2023-03-01T14:03:24Z
21 2023-03-01T14:03:25Z
22 2023-03-01T14:03:26Z
26 2023-03-01T14:03:27Z
22 2023-03-01T14:03:28Z
16 2023-03-01T14:03:29Z
19 2023-03-01T14:03:30Z
16 2023-03-01T14:03:31Z
20 2023-03-01T14:03:32Z
26 2023-03-01T14:03:33Z
20 2023-03-01T14:03:34Z
32 2023-03-01T14:03:35Z
19 2023-03-01T14:03:36Z
22 2023-03-01T14:03:37Z
16 2023-03-01T14:03:38Z
22 2023-03-01T14:03:39Z
19 2023-03-01T14:03:40Z
13 2023-03-01T14:03:41Z
39 2023-03-01T14:03:42Z
21 2023-03-01T14:03:43Z
21 2023-03-01T14:03:44Z
17 2023-03-01T14:03:45Z
25 2023-03-01T14:03:46Z
42 2023-03-01T14:03:47Z
39 2023-03-01T14:03:48Z
14 2023-03-01T14:03:49Z
16 2023-03-01T14:03:50Z
15 2023-03-01T14:03:51Z
26 2023-03-01T14:03:52Z
25 2023-03-01T14:03:53Z
13 2023-03-01T14:03:54Z
31 2023-03-01T14:03:55Z
19 2023-03-01T14:03:56Z
23 2023-03-01T14:03:57Z
38 2023-03-01T14:03:58Z
47 2023-03-01T14:03:59Z
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