在抓取过程中突然卡住三四个小时，ctrl C不会退出。应该是mq处理出现问题了

[tottilin]

Traceback (most recent call last):
File "/usr/local/lib/python2.7/threading.py", line 810, in *bootstrap_inner
self.run()
File "/usr/local/lib/python2.7/threading.py", line 763, in run
self.__target(_self.__args, _self.__kwargs)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/__init.py", line 103, in _init_process
self.put(objs, flush=flush)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/node.py", line 407, in put
self._remote_or_local_batch_put(addr, self.caches[addr])
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/node.py", line 348, in _remote_or_local_batch_put
self.mq_node.batch_put(objs)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/node.py", line 151, in batch_put
self.put(obs, force=force, priority=priority)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/node.py", line 125, in put
priority_store.put(objs, force=force)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/store.py", line 291, in put
result = self.put_one(obj, force, commit=False)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/store.py", line 266, in put_one
pos = self._seek_writable_pos(m)
File "/mnt/hgfs/crawl/cola-code/cola/core/mq/store.py", line 228, in _seek_writable_pos
size, = struct.unpack('I', map_handle[pos:pos+4])
TypeError: 'NoneType' object has no attribute 'getitem'

Catch interrupt signal, start to stop

[qinxuye]

refer to handle of #59