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[Peter Feiner <peter@xxxxxxxxxxxxxx>]

Public bug reported:

Nova uses thread-unsafe memcache client objects in multiple threads. For
instance, nova-api's metadata WSGI server uses the same
nova.api.metadata.handler.MetadataRequestHandler._cache object for every
request. A memcache client object is thread unsafe because it has a
single open socket connection to memcached. Thus the multiple threads
will read from & write to the same socket fd.

Keystoneclient has the same bug. See https://bugs.launchpad.net/python-
keystoneclient/+bug/1289074 for a patch to fix the problem.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1291637

Title:
  memcache client race

Status in OpenStack Compute (Nova):
  New

Bug description:
  Nova uses thread-unsafe memcache client objects in multiple threads.
  For instance, nova-api's metadata WSGI server uses the same
  nova.api.metadata.handler.MetadataRequestHandler._cache object for
  every request. A memcache client object is thread unsafe because it
  has a single open socket connection to memcached. Thus the multiple
  threads will read from & write to the same socket fd.

  Keystoneclient has the same bug. See https://bugs.launchpad.net
  /python-keystoneclient/+bug/1289074 for a patch to fix the problem.

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