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Savanna-cluster in waiting state

After launch cluster my cluster remains in waiting state giving error time to time .

Error is as follows as:

[31/Aug/2013 23:01:30] "GET /v1.0/0e07c2640ad843c6bd8bc651f1f90873/clusters/8cb3f13b-6322-4ead-8a51-d6aa89f4e55a HTTP/1.1" 200 1783 0.012812 Traceback (most recent call last): File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/", line 80, in _spawn_n_impl func(args, *kwargs) File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/", line 584, in process_request proto.__init__(socket, address, self) File "/usr/lib/python2.7/", line 638, in __init__ self.handle() File "/usr/lib/python2.7/", line 342, in handle self.handle_one_request() File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/", line 226, in handle_one_request self.raw_requestline = self.rfile.readline(self.server.url_length_limit) File "/usr/lib/python2.7/", line 476, in readline data = self._sock.recv(self._rbufsize) File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/", line 262, in recv timeout_exc=socket.timeout("timed out")) File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/hubs/", line 151, in trampoline listener = hub.add(hub.READ, fileno, current.switch) File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/hubs/", line 48, in add listener = BaseHub.add(self, evtype, fileno, cb) File "/root/savanna-venv3/local/lib/python2.7/site-packages/eventlet/hubs/", line 126, in add evtype, fileno, evtype)) RuntimeError: Second simultaneous read on fileno 6 detected. Unless you really know what you're doing, make sure that only one greenthread can read any particular socket. Consider using a pools.Pool. If you do know what you're doing and want to disable this error, call eventlet.debug.hub_prevent_multiple_readers(False) (3051) accepted ('', 47343) - - [31/Aug/2013 23:01:33] "GET /v1.0/0e07c2640ad843c6bd8bc651f1f90873/clusters/8cb3f13b-6322-4ead-8a51-d6aa89f4e55a HTTP/1.1" 200 1783 0.011030

How to overcome this problem ?