On 11/11/10 22:52, John Baer wrote: > > What version of MoinMoin are we running? > > John https://wiki.ubuntu.com/SystemInfo moin version 1.6.3
The issue with the wiki is that the Xapian search engine is turned off. That is the beginning and the end of all the performance issues, the timeouts that cause 500 errors and all the complaints about how much the wiki sucks and why we should switch to wikimedia. It is *the* issue with the wiki. Without Xapian turned on every search is a brute force full text search across the entire corpus of text that is wiki.ubuntu.com. OK, so you may thing, what is the big deal, searches take ages, so what? Well there are a lot of pages that include search results, 651 to be precise, here is a list of them: https://wiki.ubuntu.com/AlanBell/fullsearchpages (some are OK and are just displaying a search box, some do a search on open of the page) if you see something that looks like: <<FullSearch(searchterm)>> then that page will take 30 seconds or so to open as it hammers the heck out of the server for 30 seconds reading through the entire wiki. <<FullSearch()>> by itself is ok, that just displays a search input box and <<FullSearchCached(searchterm)>> is OK as the search is cached (just doesn't update until someone deletes the cache for that page then it takes 30 seconds to reload) OK, so these broken pages are slow, and also anti-social as they place a massive load on the server slowing it down generally for other people. In theory someone could go through these pages and change them to use cached queries, or we could just live with these being slow. Now we come on to the *big* problem. Page subscriptions are not stored on the pages themselves, they are stored on the user profiles, you can go to your user profile and see the pages you are subscribed to, which can include wildcards picking up even new pages in a part of the wiki namespace. So when you save a page on the wiki it has to send a notification email to anyone who has subscribed to the page. Can you guess how it finds the people to send mails to? hint: it takes about 30 seconds. Turning on Xapian is simple. Really simple. Here is how to do it http://moinmo.in/HelpOnXapian So why have we endured multiple years of pain and frustration? Well we are on sucky old 1.6.3, if you have a look at the release notes you will see that a number of Xapian related crashes have since been fixed http://moinmo.in/MoinMoinRelease1.8. The current release of moin is 1.9.3 and we have this in maverick. 1.9.2 in Lucid LTS would be fine too. python-moinmoin (source: moin): Python clone of WikiWiki - library. In component main, is optional. Version 1.9.3-1ubuntu1 (maverick), package size 14659 kB, installed size 25140 kB python-moinmoin (source: moin): Python clone of WikiWiki - library. In component main, is optional. Version 1.9.2-2ubuntu3.1 (lucid), package size 14469 kB, installed size 25612 kB So why has nobody gone and upgraded our paleolithic moin instance? Well there is a little bit of non-standard tinkering that went on to implement Launchpad integration. I don't believe it is much, and I am fairly sure it would not be a big job to port that to a modern version, if indeed any change was required. Moin has not had any major architectural change that I can see and themes I have been developing on 1.9.2 seem to run just fine on 1.6.3. Having discussed this with the web team it was suggested that I should push for an upgrade to be discussed at the next UDS as nothing is likely to be done before then, so this is me, starting to push for it, right now. If you are a wiki user, particularly if you have been doing less stuff on the wiki because it is just such an unproductive place to work then do join in the conversation and lets get this thing fixed. The problem is not unknown, moin does not inherently suck, transitioning to mediawiki would be disruptive and much much more work than just upgrading to the supported and packaged version in Ubuntu and turning on the Xapian option. Alan. -- Alan Bell The Open Learning Centre Web: http://www.theopenlearningcentre.com Mob: +44 (0)7738 789190 Tel: +44 (0)844 3576000 The Open Learning Centre is a trading name of Bell Lord Ltd, a company registered in England and Wales #05868943. VAT Registration #GB 901 4715 55 -- loco-contacts mailing list loco-contacts@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/loco-contacts
