Please be informed that oslo.cache 2.1.0 breaks oslo_cache.memcache_pool Kolla-Ansible gate is already RED and a quick codesearch revealed other deployment methods might be in trouble soon as well. This does not affect devstack/tempest as they use dogpile.cache.memcached instead. The error is TypeError: __init__() got an unexpected keyword argument 'dead_retry' For details see: https://bugs.launchpad.net/oslo.cache/+bug/1866008 -yoctozepto