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[Alexander Makarov <amakarov@xxxxxxxxxxxx>]

Public bug reported:

In multi-backend case there is always a chance for client to miss a
working backend among not responding.

Assuming memcached is up and running on localhost:11211:

import memcache
import random
cl = memcache.Client(['localhost:11211', 'localhost:11212', 'localhost:11213', 'localhost:11214'])
while cl.set(str(random.random()), 1): pass

'while' must be an infinite loop since cl.set() returns True on success
but it exits in milliseconds instead.

Bug may be fixed by changing backend selection logic, patch attached.

** Affects: keystone
     Importance: Undecided
         Status: New

** Patch added: "MIRA0001-get_server_fix.patch"
   https://bugs.launchpad.net/bugs/1380670/+attachment/4234454/+files/MIRA0001-get_server_fix.patch

** Description changed:

- In multi-backend case there always a chance for client to miss a working
- backend among not responding.
+ In multi-backend case there is always a chance for client to miss a
+ working backend among not responding.
  
  Assuming memcached is up and running on localhost:11211:
  
  import memcache
  import random
  cl = memcache.Client(['localhost:11211', 'localhost:11212', 'localhost:11213', 'localhost:11214'])
  while cl.set(str(random.random()), 1): pass
  
  'while' must be an infinite loop since cl.set() returns True on success
  but it exits in milliseconds instead.
  
  Bug may be fixed by changing backend selection logic, patch attached.

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https://bugs.launchpad.net/bugs/1380670

Title:
  python-memcached misses working backend

Status in OpenStack Identity (Keystone):
  New

Bug description:
  In multi-backend case there is always a chance for client to miss a
  working backend among not responding.

  Assuming memcached is up and running on localhost:11211:

  import memcache
  import random
  cl = memcache.Client(['localhost:11211', 'localhost:11212', 'localhost:11213', 'localhost:11214'])
  while cl.set(str(random.random()), 1): pass

  'while' must be an infinite loop since cl.set() returns True on
  success but it exits in milliseconds instead.

  Bug may be fixed by changing backend selection logic, patch attached.

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