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ScaleFail
(and MPs’ expenses)
Copyright © Steve Bell 2009
ScaleFail
ScaleFail
ScaleFail
ScaleFail
ScaleFail
ScaleFail
How we built it
ScaleFail
Crash #1: more
Apache children than
MySQL connections
ScaleFail
ScaleFail
unreviewed_count = Page.objects.filter(
   votes__isnull = True
).distinct().count()
SELECT
  COUNT(DISTINCT `expenses_page`.`id`)
FROM
  `expenses_page` LEFT OUTER JOIN `expenses_vote` ON (
     `expenses_page`.`id` = `expenses_vote`.`page_id`
  ) WHERE `expenses_vote`.`id` IS NULL
unreviewed_count = cache.get('homepage:unreviewed_count')
if unreviewed_count is None:
    unreviewed_count = Page.objects.filter(
       votes__isnull = True
    ).distinct().count()
    cache.set('homepage: unreviewed_count', unreviewed_count, 60)
• With 70,000 pages and a LOT of votes...
 • DB takes up 135% of CPU
• Cache the count in memcached...
 • DB drops to %35 of CPU
unreviewed_count = Page.objects.filter(
   votes__isnull = True
).distinct().count()

reviewed_count = Page.objects.filter(
   votes__isnull = False
).distinct().count()
unreviewed_count = Page.objects.filter(
   is_reviewed = False
).count()
Migrating to InnoDB
on a separate server
ssh mps-live "mysqldump mp_expenses" |
sed 's/ENGINE=MyISAM/ENGINE=InnoDB/g' |
  sed 's/CHARSET=latin1/CHARSET=utf8/g' |
  ssh mysql-big "mysql -u root mp_expenses"
“next” button
def next_global(request):
  # Next unreviewed page from the whole site
  all_unreviewed_pages = Page.objects.filter(
      is_reviewed = False
  ).order_by('?')
  if all_unreviewed_pages:
      return Redirect(
         all_unreviewed_pages[0].get_absolute_url()
      )
  else:
      return HttpResponse(
         'All pages have been reviewed!'
      )
def next_global(request):
  # Next unreviewed page from the whole site
  all_unreviewed_pages = Page.objects.filter(
      is_reviewed = False
  ).order_by('?')
  if all_unreviewed_pages:
      return Redirect(
         all_unreviewed_pages[0].get_absolute_url()
      )
  else:
      return HttpResponse(
         'All pages have been reviewed!'
      )
import random

def next_global_from_cache(request):
  page_ids = cache.get('unreviewed_page_ids')
  if page_ids:
      return Redirect(
         '/page/%s/' % random.choice(page_ids)
      )
  else:
      return next_global(request)
Next time, I’ll use redis
Read-only mode
saved our bacon
Copyright © Martin Rowson 2008

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