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Reviewed:  https://review.openstack.org/465631
Committed: https://git.openstack.org/cgit/openstack/oslo.cache/commit/?id=d6d8c361995f719e7091044abd1f6b123f269cea
Submitter: Jenkins
Branch:    master

commit d6d8c361995f719e7091044abd1f6b123f269cea
Author: Lance Bragstad <lbragstad@xxxxxxxxx>
Date:   Wed May 17 10:24:54 2017 -0500

    Improve backend configuration help text
    
    This commit adds a little more detail to the backend configuration
    option help text.
    
    Closes-Bug: 1690756
    
    Co-Authored-By: ChangBo Guo(gcb) <eric.guo@xxxxxxxxxxxx>
    Change-Id: Idf3cc36fe23c6c1d40caff72791eeb41cb1e7173


** Changed in: oslo.cache
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1690756

Title:
  cache 'backend' argument description is ambiguous

Status in OpenStack Identity (keystone):
  Invalid
Status in oslo.cache:
  Fix Released

Bug description:
  The oslo.cache backend argument description currently states:

  "Dogpile.cache backend module. It is recommended that Memcache or
  Redis (dogpile.cache.redis) be used in production deployments. For
  eventlet-based or highly threaded servers, Memcache with pooling
  (oslo_cache.memcache_pool) is recommended. For low thread servers,
  dogpile.cache.memcached is recommended. Test environments with a
  single instance of the server can use the dogpile.cache.memory
  backend."

  So the dogpile.cache.memcached/dogpile.cache.redis backends should be
  used for production deployments, but the dogpile cache is recommended
  for low thread servers and the oslo_cache.memcache_pool should be used
  for high thread servers. I don't understand what the actual
  recommendation is here.

  For a production deployment of a service using uwsgi and a web server, what is the recommendation?
  For a production deployment of a service using uwsgi and no web server, what is the recommendation?
  For a production deployment of a service using eventlet, what is the recommendation?

  Using keystone as an example, the example config file has the same
  content which does not really help to clarify anything:

  https://github.com/openstack/keystone/blob/b7bd6e301964d393ac6835111a08bbf15ba73bc0/etc/keystone.conf.sample#L514-L520

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