本文分析了一起MongoDB副本集主节点频繁切换的故障案例，错误日志显示因pthread_create失败导致连接关闭。经过排查，发现是由于CentOS系统中非root用户进程数量限制为1024，而MongoDB配置的连接数远超此值。调整系统配置，增加非root用户的最大进程数后，问题得到解决。
接到个case，mongod版本为2.4，三个节点组成高可用，发现经常频繁地切换，错误信息如下
Mon Mar 7 14:29:15.379 [initandlisten] pthread_create failed: errno:11 Resource temporarily unavailable
Mon Mar 7 14:29:15.379 [initandlisten] can't create new thread, closing connection
Mon Mar 7 14:29:15.381 [initandlisten] connection accepted from 10.10.14.71:41282 #1801013 (973 connections now open)
Mon Mar 7 14:29:15.381 [initandlisten] pthread_create failed: errno:11 Resource temporarily unavailable
Mon Mar 7 14:29:15.381 [initandlisten] can't create new thread, closing connection
Mon Mar 7 14:29:15.383 [initandlisten] connection accepted from 10.10.14.71:41270 #1801014 (973 connections now open)
Mon Mar 7 14:29:15.383 [initandlisten] pthread_create failed: errno:11 Resource temporarily unavailable
Mon Mar 7 14:29:15.383 [initandlisten] can't create new thread, closing connection
Mon Mar 7 14:29:15.385 [initandlisten] connection accepted
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