This patch specifies a set of options required to setup pymemcache's HashClient retrying feature (dogpile.cache) cache backend. Original oslo.cache change: https://review.opendev.org/c/openstack/oslo.cache/+/824944 Change-Id: I90d8e2b0cf231c9bd0fe97d4f363795886ccf8c7 (cherry picked from commit34e1446f44) (cherry picked from commitedf16447f0) (cherry picked from commitd80fbfc9de)