MemcachedKeyCharacterError: Control characters not allowed

[Curtis Hovey]

lpnet had two oopses for MemcachedKeyCharacterError, both involving project group milestones.
    https://launchpad.net/avant-window-navigator/+milestones (ProjectGroup:+milestones)
        OOPS-1713F1094
   https://launchpad.net/drizzle-umbrella/+milestones (ProjectGroup:+milestones)
        OOPS-1713L1708
I do not know how to identify what is wrong, but the last line of the oops shows a memcache call that wraps differently that the ones before it:
    pt:lpnet:lp/registry/templates/productseries-milestone-table-row.pt,9760:a:1,0:UHJvamVjdEdyb3VwOmF2YW50LXdpbmRvdy1uYXZpZ2F0b3IvTWlsZXN0b25lOjAuMy4yLW1pbGVz dG9uZQ==,https_//launchpad.net/avant-window-navigator/+milestones?6j1C7h1nlChMeOdhfHjE8
^ There appears to be space in 8 characters before the '=='

[Stuart Bishop (stub)]

The generated key should not contain any space characters. We need to munge things better.

[Robert Collins (lifeless)]

This is constently occuring on https://pastebin.canonical.com/37801/

[Curtis Hovey (sinzui)]

On Tue, 2010-09-28 at 20:53 +0000, Robert Collins wrote:
> This is constently occuring on https://pastebin.canonical.com/37801/

This error will be fixed another way then--I had, and still have, plans
to remove the cache rule on +milestones and series because the private
cache rule is very ineffective.

[Robert Collins (lifeless)]

Am going to get the milestones page memcache disabled to permit users to work, we can reinstate when sinzui removes the problematic use.

Note that this will cause the page to be disabled on staging too (because flags are in the backed up and restored db)
select * from featureflag;
              scope | priority | flag | value | date_modified
---------------------------------+----------+----------+----------+----------------------------
 pageid:ProjectGroup:+milestones | 0 | memcache | disabled | 2010-09-29 00:52:29.775074

[Launchpad QA Bot (lpqabot)]

Fixed in stable r11830 <http://bazaar.launchpad.net/~launchpad-pqm/launchpad/stable/revision/11830>.