NPW2009 - my.opera.com scalability v2.0

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An updated version of the previous IPW2008 My Opera scalability talk, presented at the Nordic Perl Workshop in Oslo, April 16th, 2009.

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NPW2009 - my.opera.com scalability v2.0

  1. 1. my.opera.com scalability v2 Nordic Perl Workshop ~ Oslo 2009 cosimo streppone <cosimo@cpan.org>
  2. 2. Users (k) 2.500 1.640 887 430 257 205 50 10 1 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  3. 3. Users (k) Servers Dyn req/s 2.500 1.640 887 257 205 430 50 10 1 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  4. 4. espenao> proxys all over. MOC is dying? hkmoen> did MOC just die? ... fred joined #myopera fred> lots of proxys... fred left #myopera ... cosimo> WTF? ok, looking into it
  5. 5. static avatars (or “put your http servers at work”)
  6. 6. new storage subsystem pools, servers fault tolerance, redundancy webdav, http, ftp, scp, mogilefs?, ...
  7. 7. user uploads use case # Create resource object for avatar my $res = MyOpera::Storage::Resource::Avatar->new( owner => '{userid}', content => '{binary data}', ); # Main storage subsystem handle my $storage = MyOpera::Storage->new(); # Upload on pools of servers all at once my $ok = $storage->upload($res);
  8. 8. resources (user uploads, binary blobs, ...) pools, servers URLs http://static.myopera.com/pool1/avatars/a4/754/a1b2c3d4e5f6.../<userid>_o.png http://static.myopera.com/pool1/avatars/a4/754/a1b2c3d4e5f6.../<userid>_t.jpg http://static.myopera.com/pool1/avatars/a4/754/a1b2c3d4e5f6.../<userid>_m.jpg http://static.myopera.com/pool1/avatars/a4/754/a1b2c3d4e5f6.../<userid>_l.jpg
  9. 9. package HTTP::DAV; ... # # Retrieves info about a DAV url # # depth=0 avoids descending into dirs # sub propfind { my ($self, $url, $depth) = @_; $depth ||= 1; # ... }
  10. 10. new cool static URLs http://static.myopera.com/ /avatars/pool1/ /dL/rLA/vdUxYn14kfe342QEM/ /<user-id>_s.jpg crappy CGI-style URLs http://my.opera.com/<user>/avatar.pl
  11. 11. /* results */ saved ~500k backend req/day browser cache used!
  12. 12. shared-nothing architecture (“zero tolerance for sharing”)
  13. 13. lvs + lw httpd mod_perl ..... backends nfs server disk cache users store
  14. 14. dogpile effect (or the cache “storms”)
  15. 15. nfs-based file cache /var/cache/myopera/ /var/cache/myopera/feeds/ /var/cache/myopera/blogs/ ... /var/cache/myopera/user/ /var/cache/myopera/user/1 /var/cache/myopera/user/10 /var/cache/myopera/user/11 /var/cache/myopera/user/2 ... (another 2 million entries) ... /var/cache/myopera/user/1999999 (on ext3)
  16. 16. soft counters use MyOpera::Counter; my $counter = MyOpera::Counter->new({ key => “blog.access-$entry”, sync => sub { my ($value) = @_; # Real table update code ... } }); $counter->inc();
  17. 17. dml statistics [DML] time=1237308152, user=, url=/tinh_yeu_cua_anh_b88/blog/index.dml/tag/..., name=XWA::User, variable=active, type=module, elapsed=0.068473, host=my.opera.com [DML] time=1237308152, user=, url=/community/, name=XWA::User, variable=, type=module, elapsed=0.015935, host=my.opera.com [DML] ...
  18. 18. top time-intensive modules XWA::XMLProd::User::Sidebar 2024.919s (27.2%, 0.28 s/call) XWA::User 1778.445s (23.9%, 0.09 s/call) XWA::User::Journal 1121.224s (15.1%, 0.24 s/call) XWA::User::Album 321.522s ( 4.3%, 0.17 s/call) XWA::User::Journal::Search 223.477s ( 3.0%, 20.32 s/call) XWA::User::Comments 188.011s ( 2.5%, 0.05 s/call) XWA::Skins 180.486s ( 2.4%, 0.49 s/call) XWA::User::JournalArchive 159.525s ( 2.1%, 4.43 s/call) XWA::User::Posts 146.644s ( 2.0%, 0.45 s/call) XWA::User::Picture 141.324s ( 1.9%, 0.10 s/call) XWA::Albums 93.740s ( 1.3%, 2.04 s/call) XWA::Journals 92.390s ( 1.2%, 2.37 s/call)
  19. 19. most called modules XWA::User 18784 calls 28.9% XWA::XMLProd::User::Sidebar 7186 calls 11.1% XWA::User::Spotlight 6439 calls 9.9% XWA::Util::OneTimeKey 5576 calls 8.6% XWA::User::Journal 4681 calls 7.2% XWA::OIVWrapper 3974 calls 6.1% XWA::User::Comments 3890 calls 6.0% XWA::User::Album 1881 calls 2.9% XWA::User::Ratings 1500 calls 2.3% XWA::User::Picture 1485 calls 2.3% XWA::XMLProd::MemberCount 611 calls 0.9% XWA::XMLProd::Queue 589 calls 0.9% XWA::Spotlight 569 calls 0.9% MyOpera::DML::FastFacts 567 calls 0.9% XWA::XMLProd::Variables 562 calls 0.9%
  20. 20. slowest modules XWA::User::Journal::Search 20.32s (11 calls) XWA::User::JournalArchive 4.43s (36 calls) XWA::User::GeneratePassword 3.76s (3 calls) XWA::XMLProd::Link::Bookmarks 3.45s (12 calls) XWA::Fans 3.37s (10 calls) XWA::User::ForumLatestFriends 3.36s (11 calls) XWA::User::ForumNew 2.42s (3 calls) XWA::Journals 2.37s (39 calls) XWA::Albums 2.04s (46 calls) XWA::XMLProd::UserSearch 1.87s (2 calls) XWA::Jahoo 1.83s (46 calls) XWA::Forum 1.64s (49 calls) XWA::XMLProd::Link::Trash 0.86s (2 calls) XWA::XMLProd::LocationSearch 0.72s (43 calls) XWA::User::ForumSearch 0.67s (78 calls)
  21. 21. ?questions?
  22. 22. low level TCP/IP “throttling” # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- x.x.x.x/x anywhere limit: avg 20/sec burst 5 ACCEPT all -- y.y.y.y/x anywhere limit: avg 20/sec burst 5 DROP all -- x.x.x.x/x anywhere DROP all -- y.y.y.y/y anywhere
  23. 23. full-page caching - limiting “barrier” - url hotlist
  24. 24. mod_cband
  25. 25. Web site monitoring, in case the live demo fails :-)

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