Removes hash_distribution_replicas configuration option

`hash_distribution_replicas` was deprecated in the Stein cycle (12.1.0).

Story: #1680160
Task: #30033

Change-Id: Iddc59ed113fb9808f8c8564433475638491be84f

doc/source/admin/report.txt

@@ -285,7 +285,6 @@ default:
   force_raw_images = True
   graceful_shutdown_timeout = 60
   grub_config_template = /opt/stack/ironic/ironic/common/grub_conf.template
-  hash_distribution_replicas = 1
   hash_partition_exponent = 5
   hash_ring_reset_interval = 180
   host = ubuntu

ironic/conductor/base_manager.py

@@ -427,9 +427,7 @@ class BaseConductorManager(object):
         except exception.DriverNotFound:
             return False
 
-        return self.host in ring.get_nodes(
+        return self.host in ring.get_nodes(node_uuid.encode('utf-8'))
-            node_uuid.encode('utf-8'),
-            replicas=CONF.hash_distribution_replicas)
 
     def _fail_if_in_state(self, context, filters, provision_state,
                           sort_key, callback_method=None,

ironic/conductor/rpcapi.py

@@ -142,8 +142,7 @@ class ConductorAPI(object):
         try:
             ring = self.ring_manager.get_ring(node.driver,
                                               node.conductor_group)
-            dest = ring.get_nodes(node.uuid.encode('utf-8'),
+            dest = ring.get_nodes(node.uuid.encode('utf-8'))
-                                  replicas=CONF.hash_distribution_replicas)
             return dest.pop()
         except exception.DriverNotFound:
             reason = (_('No conductor service registered which supports '

ironic/conf/default.py

@@ -184,15 +184,6 @@ hash_opts = [
                       'smooth in most cases. The default is suitable for up '
                       'to a few hundred conductors. Configuring for too many '
                       'partitions has a negative impact on CPU usage.')),
-    cfg.IntOpt('hash_distribution_replicas',
-               default=1,
-               help=_('[Experimental Feature] '
-                      'Number of hosts to map onto each hash partition. '
-                      'Setting this to more than one will cause additional '
-                      'conductor services to prepare deployment environments '
-                      'and potentially allow the Ironic cluster to recover '
-                      'more quickly if a conductor instance is terminated.'),
-               deprecated_for_removal=True),
     cfg.IntOpt('hash_ring_reset_interval',
                default=15,
                help=_('Time (in seconds) after which the hash ring is '

releasenotes/notes/remove-deprecated-hash_distribution_replicas-08351358eba4c9e1.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    The configuration option ``[DEFAULT]/hash_distribution_replicas`` was
+    deprecated in the Stein cycle. It has been removed
+    and is no longer supported.