python-memcached并发调用get/set时出现RunTimeError：Second simultaneous read on fileno 8 detected.

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于 2013-03-08 20:19:49 发布

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分类专栏： python openstack 文章标签： python memcached

本文链接：https://blog.youkuaiyun.com/hzzhoushaoyu/article/details/8652021

在使用python-memcached库时遇到RuntimeError：Second simultaneous read on fileno 8 detected. 问题，怀疑是多线程或进程并发访问socket导致。解决方案是在每次get、set、delete操作时创建新的memcache客户端。虽然不清楚具体原因，但此方法有效且多次测试未重现问题。

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出现异常如下 RuntimeError: Second simultaneous read on fileno 8 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_multiple_reader_prevention(False)

2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake   File "/usr/lib/python2.7/dist-packages/memcache.py", line 862, in get
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake     return self._get('get', key)
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake   File "/usr/lib/python2.7/dist-packages/memcache.py", line 846, in _get
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake     return _unsafe_get()
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake   File "/usr/lib/python2.7/dist-packages/memcache.py", line 830, in _unsafe_get
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake     rkey, flags, rlen, = self._expectvalue(server)
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake   File "/usr/lib/python2.7/dist-packages/memcache.py", line 955, in _expectvalue
2013-03-08 18:27:27 17870 TRACE glance.store.chunkcache.fake     line = server.re

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