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When Wikipedia goes down |
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| EricBarbour |
Thu 2nd July 2009, 10:34pm
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blah
        
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Amazing how ignorant your guys are about your favorite "encyclopedia". Some of the servers are in Tampa, some are in Amsterdam, and some are in Seoul. PS--the Wikitech hasn't been updated substantially in months/years, so there are probably other servers elsewhere. They use Squid. A lot. There's probably no practical way in hell to figure out where a chunk of data is in a system like this at any given moment.
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| emesee |
Thu 9th July 2009, 5:22am
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ban me
    
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| Apathetic |
Fri 31st July 2009, 1:01pm
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Über Member
    
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QUOTE(Nerd @ Wed 29th July 2009, 8:13pm)  QUOTE(Apathetic @ Thu 30th July 2009, 1:10am)  slow as hell right now
Are you Emesee in disguise? no, why do you say that? down again! =\ http://lists.wikimedia.org/pipermail/wikit...uly/044406.htmlQUOTE Hello,
Due to a problem in one of our core routers in our Tampa cluster we need to perform some network maintenance tomorrow, Friday July 31st around 12:00 UTC. We will be performing a software upgrade and reboot of the router. This should not take more than a few minutes if everything goes well. Unfortunately this means that practically all sites and services will be down during that time.
For those interested: one of the line cards in the router failed earlier this week. A replacement has arrived, but does not boot up correctly after hot plugging. Because we want to upgrade the firmware anyway, we will reboot the entire box.
Cheers,
-- Mark Bergsma System & Network Administrator, Wikimedia Foundation
This post has been edited by Apathetic: Fri 31st July 2009, 1:03pm
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| Kelly Martin |
Fri 31st July 2009, 3:11pm
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Bring back the guttersnipes!
       
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QUOTE(EricBarbour @ Thu 2nd July 2009, 4:55pm)  You're starting to see the true horror of keeping a major multi-colocated database website up and going. It's like running LexisNexis, but on open-source software and with no money and no hot backup. I'm amazed they don't have major outages every day. Indeed, it's amazing that they stay up as much as they do, given the number of single points of failure there are in their architecture. To be fair, many of them are forced by their choice to use mysql as a backend database, instead of a more robust product like, say, Oracle. The router downtime that was mentioned above should have been avoidable if they had a proper hot-spare environment. But that costs a bit more money, and spending money on that would cut down on the size of Jimmy's castle fund. QUOTE(EricBarbour @ Thu 2nd July 2009, 5:34pm)  They use Squid. A lot. There's probably no practical way in hell to figure out where a chunk of data is in a system like this at any given moment. I think something like two-thirds of their servers are just Squid engines. MediaWiki is way too slow to generate all the pages that Wikimedia serves across all the projects in real time. It constantly amuses me to hear PHP culties go on about how well PHP scales, citing Wikipedia as proof, when the reality is that PHP scales like crap and the WMF has to throw tons of hardware at their half-assed content engine just to keep up.
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