having two masters on the same cluster is a very dangerous
situation and will most likely lead to data loss.
+SHUTDOWN
+~~~~~~~~
+
+When the master daemon receives a ``SIGINT`` (Ctrl-C) or ``SIGTERM``
+signal, it stops accepting new jobs and prepares to shut down shortly
+after jobs running at the time finish. Meanwhile it still responds to
+LUXI requests. Pending jobs are re-queued after the daemon is started
+again. When a second signal is received, the master daemon terminates
+without waiting (it might still need to wait for some threads to
+finish). Note that the latter, as well as sending ``SIGKILL``, may leave
+the cluster in an inconsistent state.
+
JOB QUEUE
~~~~~~~~~