On Fri, Sep 7, 2018 at 1:26 AM, Pine W wiki.pine@gmail.com wrote:
Thanks very much for the explanation. I have more questions but they're out of curiosity and I don't want to "hold the train" with additional questions. After the switchover and switchback are done, if someone writes a blog post or report about the why and how of these events, I'd like to read it.
There was a blog post about the last switchover we did, I don't know whether there will be one for this time.
https://blog.wikimedia.org/2017/04/18/codfw-temporary-editing-pause/
Manuel.
Pine ( https://meta.wikimedia.org/wiki/User:Pine )
On Thu, Sep 6, 2018 at 9:22 AM Manuel Arostegui marostegui@wikimedia.org wrote:
On Wed, Sep 5, 2018 at 8:49 PM, Pine W wiki.pine@gmail.com wrote:
Thanks as usual for these, Grace.
I feel good if I can vaguely understand 50% of what's in these notes.
I have an elementary question, and I hope that I'm not testing anyone's patience with this question. Do the switchover/switchback issues and related requests to freeze certain activities have any impact on Fundraising Tech? My guess is that Fundraising Tech is making
preparations
for the annual Big English banner fundraising, and in the past I
believe
that preparations have included low intensity banner effectiveness and donation workflow/pipeline testing. I'm hoping that there are no
adverse
impacts from the DB issues on Fundraising Tech.
Thanks,
Hello,
The DB freeze should not affect anything Fundraising related as they do
not
require (as far as I have seen so far) any schema changes to be deployed
on
core servers. Let me elaborate a bit more on that.
During the switchover and the time that CODFW is the active datacenter,
we
will be able to finish a bunch of tasks on, mostly, EQIAD database
masters
( https://phabricator.wikimedia.org/T189107). Those tasks are normally hard/risky/impossible to do whilst those masters are active, so we have grouped them to get them done while the those
become
passive. What does this mean : "For the duration of the switchover (1 month),
please
refrain from large db schema changes and please avoid deploying any kind
of
new feature that requires creation of tables."
It means that hopefully, we will be able to close the majority of those tasks as "Resolved", and those will unblock features, but we do not want those features to be enabled/deployed whilst we are on CODFW datacenter, they should be enabled or deployed once we are back on EQIAD datacenter.
I hope this clarifies a bit more the idea behind that paragraph.
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