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+
+Architecture
+------------
+
+.. figure:: http://i.imgur.com/wTIeg2T.png
+   :alt: Django Q schema
+
+
+Signed Tasks
+""""""""""""
+
+Tasks are first pickled and then signed using Django's own
+signing module before being sent to a Redis list. This ensures that task
+packages on the Redis server can only be executed and read by clusters
+and django servers who share the same secret key.
+Optionally the packages can be compressed before transport
+
+Pusher
+""""""
+
+The pusher process continuously checks the Redis list for new task
+packages and pushes them on the Task Queue.
+
+Worker
+""""""
+
+A worker process checks the package signing, unpacks the task, executes
+it and saves the return value. Irrespective of the failure or success of
+any of these steps, the package is then pushed onto the Result Queue.
+
+
+Monitor
+"""""""
+
+The result monitor checks the Result Queue for processed packages and
+saves both failed and successful packages to the Django database.
+
+
+Sentinel
+""""""""
+
+The sentinel spawns all process and then checks the health of all
+workers, including the pusher and the monitor. Reincarnating processes
+if any may fail. In case of a stop signal, the sentinel will halt the
+pusher and instruct the workers and monitor to finish the remaining
+items , before exiting. see Stop procedure
+
+Timeouts
+""""""""
+Before each task execution the worker resets a timer on the sentinel and resets it again after execution.
+Meanwhile the the sentinel checks if the timers don't exceed the timeout amount, in which case it will terminate the worker and reincarnate a new one.
+
+Hooks
+"""""
+
+Packages can be assigned a hook function, upon completion of the package
+this function will be called with the Task object as the first argument.
+
+Stop procedure
+""""""""""""""
+
+When a stop signal is given, the sentinel exits the guard loop and instructs the pusher to stop pushing.
+Once this is confirmed, the sentinel pushes poison pills onto the task queue and will wait for all the workers to die.
+This ensure that the task is emptied before the workers exit. Afterwards the sentinel waits for the monitor to empty the result queue before the stop flow is complete.
+