diff --git a/watcher/applier/rpcapi.py b/watcher/applier/rpcapi.py
index bbf2903f7..607d3882e 100644
--- a/watcher/applier/rpcapi.py
+++ b/watcher/applier/rpcapi.py
@@ -63,10 +63,3 @@ class ApplierAPI(messaging_core.MessagingCore):
         return self.client.call(
             context.to_dict(), 'launch_action_plan',
             action_plan_uuid=action_plan_uuid)
-
-    def event_receive(self, event):
-        try:
-            pass
-        except Exception as e:
-            LOG.exception(e)
-            raise
diff --git a/watcher/common/nova_helper.py b/watcher/common/nova_helper.py
index bb237d323..ce8ebd8b3 100644
--- a/watcher/common/nova_helper.py
+++ b/watcher/common/nova_helper.py
@@ -265,58 +265,6 @@ class NovaHelper(object):
 
             return True
 
-    def built_in_non_live_migrate_instance(self, instance_id, hypervisor_id):
-        """This method does a live migration of a given instance
-
-        This method uses the Nova built-in non-live migrate()
-        action to migrate a given instance.
-        It returns True if the migration was successful, False otherwise.
-
-        :param instance_id: the unique id of the instance to migrate.
-        """
-
-        LOG.debug(
-            "Trying a Nova built-in non-live "
-            "migrate of instance %s ..." % instance_id)
-
-        # Looking for the instance to migrate
-        instance = self.find_instance(instance_id)
-
-        if not instance:
-            LOG.debug("Instance not found: %s" % instance_id)
-            return False
-        else:
-            host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
-            LOG.debug(
-                "Instance %s found on host '%s'." % (instance_id, host_name))
-
-            instance.migrate()
-
-            # Poll at 5 second intervals, until the status is as expected
-            if self.wait_for_instance_status(instance,
-                                             ('VERIFY_RESIZE', 'ERROR'),
-                                             5, 10):
-
-                instance = self.nova.servers.get(instance.id)
-
-                if instance.status == 'VERIFY_RESIZE':
-                    host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
-                    LOG.debug(
-                        "Instance %s has been successfully "
-                        "migrated to host '%s'." % (
-                            instance_id, host_name))
-
-                    # We need to confirm that the resize() operation
-                    # has succeeded in order to
-                    # get back instance state to 'ACTIVE'
-                    instance.confirm_resize()
-
-                    return True
-                elif instance.status == 'ERROR':
-                    LOG.debug("Instance %s migration failed" % instance_id)
-
-        return False
-
     def live_migrate_instance(self, instance_id, dest_hostname,
                               block_migration=False, retry=120):
         """This method does a live migration of a given instance
diff --git a/watcher/common/service.py b/watcher/common/service.py
index 0f6055cfe..89a34aa9c 100644
--- a/watcher/common/service.py
+++ b/watcher/common/service.py
@@ -102,7 +102,7 @@ class RPCService(service.Service):
                      '%(host)s.'),
                  {'service': self.topic, 'host': self.host})
 
-    def _handle_signal(self, signo, frame):
+    def _handle_signal(self):
         LOG.info(_LI('Got signal SIGUSR1. Not deregistering on next shutdown '
                      'of service %(service)s on host %(host)s.'),
                  {'service': self.topic, 'host': self.host})
diff --git a/watcher/db/sqlalchemy/migration.py b/watcher/db/sqlalchemy/migration.py
index 6cd020af6..6d34341b4 100644
--- a/watcher/db/sqlalchemy/migration.py
+++ b/watcher/db/sqlalchemy/migration.py
@@ -32,7 +32,7 @@ def _alembic_config():
     return config
 
 
-def version(config=None, engine=None):
+def version(engine=None):
     """Current database version.
 
     :returns: Database version
diff --git a/watcher/doc.py b/watcher/doc.py
index ec91a6420..0db9fb172 100644
--- a/watcher/doc.py
+++ b/watcher/doc.py
@@ -47,7 +47,7 @@ class WatcherTerm(rst.Directive):
     # You need to put an import path as an argument for this directive to work
     required_arguments = 1
 
-    def add_textblock(self, textblock, *lineno):
+    def add_textblock(self, textblock):
         for line in textblock.splitlines():
             self.add_line(line)