Don't raise AlreadyRegistered anymore for backward compatibility

celery/registry.py

@@ -1,7 +1,7 @@
 """celery.registry"""
 from celery import discovery
 from celery.utils import get_full_cls_name
-from celery.exceptions import NotRegistered, AlreadyRegistered
+from celery.exceptions import NotRegistered
 from UserDict import UserDict
 import inspect
 
@@ -9,7 +9,6 @@ import inspect
 class TaskRegistry(UserDict):
     """Site registry for tasks."""
 
-    AlreadyRegistered = AlreadyRegistered
     NotRegistered = NotRegistered
 
     def __init__(self):
@@ -21,25 +20,13 @@ class TaskRegistry(UserDict):
 
     def register(self, task):
         """Register a task in the task registry.
-
-        Task can either be a regular function, or a class inheriting
-        from :class:`celery.task.Task`.
-
-        :keyword name: By default the :attr:`Task.name` attribute on the
-            task is used as the name of the task, but you can override it
-            using this option.
-
-        :raises AlreadyRegistered: if the task is already registered.
-
+         
+        The task will be automatically instantiated if it's a class
+        not an instance.
         """
 
         task = task() if inspect.isclass(task) else task
         name = task.name
-
-        if name in self.data:
-            raise self.AlreadyRegistered(
-                    "Task with name %s is already registered." % name)
-
         self.data[name] = task
 
     def unregister(self, name):