MySQL server has gone away

      最近接手的是个python脚本,经过crontab按期运行,用facebook提供的api抓取数据,处理后再插入到数据库.

许多人反映这个服务不稳定,抓取的数据不全.

我在测试的过程当中发现,这个脚本开发的时间已通过了好久了,facebook提供的接口数据已经有所调整. 因此会有数据

格式不对的问题;还有就是在跑了个小时后,会抛出 ‘MySQL server has gone away’ 的异常..

网上找到的相似案例以下:

http://stackoverflow.com/questions/8689649/solving-mysql-server-has-gone-away-errors

http://stackoverflow.com/questions/7942154/mysql-error-2006-mysql-server-has-gone-away

我观察到操做数据库的类库是torndb,已通过去这么久,会不会这个bug在官方也有反应并修复了呢.

果不其然..

   1:   

   2:      def _ensure_connected(self):

   3:          # Mysql by default closes client connections that are idle for

   4:          # 8 hours, but the client library does not report this fact until

   5:          # you try to perform a query and it fails.  Protect against this

   6:          # case by preemptively closing and reopening the connection

   7:          # if it has been idle for too long (7 hours by default).

   8:          if (self._db is None or

   9:              (time.time() - self._last_use_time > self.max_idle_time)):

  10:              self.reconnect()

  11:          self._last_use_time = time.time()