[QA] Fwd: [Engineering] Migrating test.wikipedia.org to HHVM

[Greg Grossmeier]

FYI

----- Forwarded message from Ori Livneh <ori at wikimedia.org> -----

> Date: Tue, 5 Aug 2014 10:53:59 -0700
> From: Ori Livneh <ori at wikimedia.org>
> To: "Development and Operations engineers (WMF only)" <engineering at lists.wikimedia.org>, Wikimedia developers <wikitech-l at lists.wikimedia.org>
> Subject: [Engineering] Migrating test.wikipedia.org to HHVM
> 
> (apologies for cross-posting)
> 
> On either Thursday or Friday of this week, Giuseppe Lavagetto (of the
> Wikimedia TechOps team) and I are planning to migrate <
> https://test.wikipedia.org/> (testwiki) to HHVM. The way testwiki is
> configured makes it a natural next step on the path leading from the Beta
> Cluster to production. Specifically, testwiki is served by the same
> load-balancer, reverse-proxy, and database servers as the rest of
> production, but it is powered by a single application server that is
> segregated from the pool of servers that handle requests for all other
> Wikimedia wikis. This means that if we run into stability issues with HHVM,
> they will be confined to just testwiki, and will not spill over to other
> sites.
> 
> To migrate testwiki to HHVM, Giuseppe will need to take the server that
> powers testwiki off-line for several hours for re-imaging. Ordinarily, we
> design our infrastructure for redundancy and graceful failover, so we can
> take machines offline without impacting users. But the corollary to
> testwiki being a special case is that it is not configured in this way. As
> I explained above, this is just as well, because it means we can perform
> this work without disturbing the rest of the cluster.
> 
> Giuseppe and I will provide additional notices via IRC and e-mail prior to
> beginning this work. We know that testwiki is used by a diverse user-base
> to test various MediaWiki software components and will do our best to
> minimize disruption to such users. Feel free to get in touch via e-mail or
> IRC (my nickname is 'ori') if you have concerns about the deployment.
> 
> Thanks for your patience and understanding! :)
> 
> Ori

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