在过去的几周里，我们一直在 prod 中遇到这个问题。
每隔几天，我们的 compose.io Mongo 数据库的连接数就会飙升至接近 5000，这是连接限制。这种行为似乎没有任何特定的触发器。
日志如下所示：
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65418 [13/Aug/2018:23:57:32.327] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65247 [13/Aug/2018:23:57:32.343] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 64999 [14/Aug/2018:00:02:32.346] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 63983 [14/Aug/2018:00:02:32.348] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 62910 [14/Aug/2018:00:02:32.350] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65460 [13/Aug/2018:23:57:32.358] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 62628 [14/Aug/2018:00:02:32.361] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 51179 [13/Aug/2018:23:57:32.366] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65482 [13/Aug/2018:23:57:32.366] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 63903 [14/Aug/2018:00:02:32.369] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65230 [13/Aug/2018:23:57:32.372] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 62848 [14/Aug/2018:00:02:32.372] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 64977 [14/Aug/2018:00:02:32.372] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 63939 [14/Aug/2018:00:02:32.374] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65192 [13/Aug/2018:23:57:32.385] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65367 [13/Aug/2018:23:57:32.393] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 63863 [14/Aug/2018:00:02:32.396] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 64927 [14/Aug/2018:00:02:32.397] ft_mongodb/1: Connection closed during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 51175 [13/Aug/2018:23:57:32.403] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 63241 [13/Aug/2018:23:57:32.411] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65483 [13/Aug/2018:23:57:32.417] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 65507 [13/Aug/2018:23:57:32.432] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 51343 [13/Aug/2018:23:57:32.437] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 63586 [13/Aug/2018:23:57:32.437] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 51427 [13/Aug/2018:23:57:32.449] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 49828 [13/Aug/2018:23:57:32.465] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:02:32.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 49739 [13/Aug/2018:23:57:32.581] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:03:21.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: syslogd.25 | 212.233.54.22 62849 [13/Aug/2018:23:58:21.377] ft_mongodb/1: Timeout during SSL handshake
2018-08-14T00:03:21.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: mongos.23 | 2018-08-14T00:03:21.824+0000 I NETWORK [mongosMain] connection accepted from 127.0.0.1:40921 #3922079 (4941 connections now open)
2018-08-14T00:03:22.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: mongos.23 | 2018-08-14T00:03:22.469+0000 I NETWORK [mongosMain] connection accepted from 127.0.0.1:40961 #3922080 (4942 connections now open)
2018-08-14T00:03:24.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: mongos.23 | 2018-08-14T00:03:24.246+0000 I NETWORK [mongosMain] connection accepted from 127.0.0.1:41042 #3922081 (4943 connections now open)
2018-08-14T00:03:24.000+00:00 aws-eu-west-1-portal.9.dblayer.com mongodb320: mongos.23 | 2018-08-14T00:03:24.340+0000 I NETWORK [mongosMain] connection accepted from 127.0.0.1:41049 #3922082 (4944 connections now open)
Compose 支持告诉我们，这几乎肯定是 MongoDB 驱动程序的问题，我们应该使用连接池。是否有一些我们需要实现的 Meteor 连接池配置？