diff --git a/keystonemiddleware/auth_token/_cache.py b/keystonemiddleware/auth_token/_cache.py
index 8951b375..94aa7cde 100644
--- a/keystonemiddleware/auth_token/_cache.py
+++ b/keystonemiddleware/auth_token/_cache.py
@@ -124,7 +124,7 @@ class TokenCache(object):
 
     def __init__(self, log, cache_time=None,
                  env_cache_name=None, memcached_servers=None,
-                 use_advanced_pool=False, dead_retry=None, socket_timeout=None,
+                 use_advanced_pool=True, dead_retry=None, socket_timeout=None,
                  **kwargs):
         self._LOG = log
         self._cache_time = cache_time
@@ -150,6 +150,13 @@ class TokenCache(object):
                                        **self._memcache_pool_options)
 
         else:
+            if not self._use_advanced_pool:
+                self._LOG.warning(
+                    "Using the eventlet-unsafe cache pool is deprecated."
+                    "It is recommended to use eventlet-safe cache pool"
+                    "implementation from oslo.cache. This can be enabled"
+                    "through config option memcache_use_advanced_pool = True")
+
             return _CachePool(self._memcached_servers, self._LOG)
 
     def initialize(self, env):
diff --git a/keystonemiddleware/auth_token/_opts.py b/keystonemiddleware/auth_token/_opts.py
index 15dd4f64..1ddef7d3 100644
--- a/keystonemiddleware/auth_token/_opts.py
+++ b/keystonemiddleware/auth_token/_opts.py
@@ -145,10 +145,9 @@ _OPTS = [
                help='(Optional) Number of seconds that an operation will wait '
                     'to get a memcached client connection from the pool.'),
     cfg.BoolOpt('memcache_use_advanced_pool',
-                default=False,
+                default=True,
                 help='(Optional) Use the advanced (eventlet safe) memcached '
-                     'client pool. The advanced pool will only work under '
-                     'python 2.x.'),
+                     'client pool.'),
     cfg.BoolOpt('include_service_catalog',
                 default=True,
                 help='(Optional) Indicate whether to set the X-Service-Catalog'
diff --git a/releasenotes/notes/deprecate-eventlet-unsafe-memcacheclientpool-f8b4a6733513d73e.yaml b/releasenotes/notes/deprecate-eventlet-unsafe-memcacheclientpool-f8b4a6733513d73e.yaml
new file mode 100644
index 00000000..22699940
--- /dev/null
+++ b/releasenotes/notes/deprecate-eventlet-unsafe-memcacheclientpool-f8b4a6733513d73e.yaml
@@ -0,0 +1,22 @@
+---
+deprecations:
+  - |
+    We no longer recommend using the eventlet unsafe keystonemiddleware's
+    memcacheclientpool. This implementation may result in growing connections
+    to memcached.
+
+    It is recommended that the ``memcache_use_advanced_pool`` option
+    is set to ``True`` in the ``keystone_authtoken`` configuration section of
+    the various services (e.g. nova, glance, ...) when memcached is used for
+    token cache.
+upgrade:
+  - |
+    [`bug 1892852 <https://bugs.launchpad.net/keystonemiddleware/+bug/1892852>`_]
+    [`bug 1888394 <https://bugs.launchpad.net/oslo.cache/+bug/1888394>`_]
+    [`bug 1883659 <https://bugs.launchpad.net/keystonemiddleware/+bug/1883659>`_]
+    Keystonemiddleware now using eventlet-safe implementation of
+    ``MemcacheClientPool`` from oslo.cache's library by default.
+    The ``keystonemiddleware`` implementation is now deprecated. For backwards
+    compatibility, the ``[keystone_authtoken] memcache_use_advanced_pool``
+    option can be set to ``False`` config files of the various services (e.g.
+    nova, glance, ...) when memcached is used for token cache.