Added documentation about the verification of BalancingDispatcher + Router (added to both Dispatcher and Routing docs)

akka-docs/java/dispatchers.rst

@@ -70,7 +70,7 @@ There are 4 different types of message dispatchers:
 
 * BalancingDispatcher
 
-  - This is an executor based event driven dispatcher that will try to redistribute work from busy actors to idle actors. 
+  - This is an executor based event driven dispatcher that will try to redistribute work from busy actors to idle actors.
 
   - It is assumed that all actors using the same instance of this dispatcher can process all messages that have been sent to one of the actors; i.e. the actors belong to a pool of actors, and to the client there is no guarantee about which actor instance actually processes a given message.
 
@@ -85,9 +85,11 @@ There are 4 different types of message dispatchers:
                "thread-pool-executor" or the FQCN of
                an ``akka.dispatcher.ExecutorServiceConfigurator``
 
+  - Note that you can **not** use a ``BalancingDispatcher`` together with any kind of ``Router``, trying to do so will make your actor fail verification.
+
 * CallingThreadDispatcher
 
-  - This dispatcher runs invocations on the current thread only. This dispatcher does not create any new threads, 
+  - This dispatcher runs invocations on the current thread only. This dispatcher does not create any new threads,
     but it can be used from different threads concurrently for the same actor. See :ref:`TestCallingThreadDispatcherRef`
     for details and restrictions.
 

akka-docs/java/routing.rst

@@ -375,7 +375,8 @@ The dispatcher for created children of the router will be taken from
 makes sense to configure the :class:`BalancingDispatcher` if the precise
 routing is not so important (i.e. no consistent hashing or round-robin is
 required); this enables newly created routees to pick up work immediately by
-stealing it from their siblings.
+stealing it from their siblings. Note that you can **not** use a ``BalancingDispatcher``
+together with any kind of ``Router``, trying to do so will make your actor fail verification.
 
 The “head” router, of course, cannot run on the same balancing dispatcher,
 because it does not process the same messages, hence this special actor does

akka-docs/scala/dispatchers.rst

@@ -71,7 +71,7 @@ There are 4 different types of message dispatchers:
 
 * BalancingDispatcher
 
-  - This is an executor based event driven dispatcher that will try to redistribute work from busy actors to idle actors. 
+  - This is an executor based event driven dispatcher that will try to redistribute work from busy actors to idle actors.
 
   - It is assumed that all actors using the same instance of this dispatcher can process all messages that have been sent to one of the actors; i.e. the actors belong to a pool of actors, and to the client there is no guarantee about which actor instance actually processes a given message.
 
@@ -86,9 +86,11 @@ There are 4 different types of message dispatchers:
                "thread-pool-executor" or the FQCN of
                an ``akka.dispatcher.ExecutorServiceConfigurator``
 
+  - Note that you can **not** use a ``BalancingDispatcher`` together with any kind of ``Router``, trying to do so will make your actor fail verification.
+
 * CallingThreadDispatcher
 
-  - This dispatcher runs invocations on the current thread only. This dispatcher does not create any new threads, 
+  - This dispatcher runs invocations on the current thread only. This dispatcher does not create any new threads,
     but it can be used from different threads concurrently for the same actor. See :ref:`TestCallingThreadDispatcherRef`
     for details and restrictions.
 
@@ -112,8 +114,8 @@ And then using it:
 
 .. includecode:: ../scala/code/akka/docs/dispatcher/DispatcherDocSpec.scala#defining-pinned-dispatcher
 
-Note that ``thread-pool-executor`` configuration as per the above ``my-thread-pool-dispatcher`` exmaple is 
-NOT applicable. This is because every actor will have its own thread pool when using ``PinnedDispatcher``, 
+Note that ``thread-pool-executor`` configuration as per the above ``my-thread-pool-dispatcher`` exmaple is
+NOT applicable. This is because every actor will have its own thread pool when using ``PinnedDispatcher``,
 and that pool will have only one thread.
 
 Mailboxes

akka-docs/scala/routing.rst

@@ -375,7 +375,9 @@ The dispatcher for created children of the router will be taken from
 makes sense to configure the :class:`BalancingDispatcher` if the precise
 routing is not so important (i.e. no consistent hashing or round-robin is
 required); this enables newly created routees to pick up work immediately by
-stealing it from their siblings.
+stealing it from their siblings. Note that you can **not** use a ``BalancingDispatcher``
+together with any kind of ``Router``, trying to do so will make your actor fail verification.
+
 
 .. note::