Spring data mongoDB未关闭mongob连接

Question

我将spring data mongodb（1.7.0.RELEASE）与spring webmvc框架一起用于我的web应用程序。我使用mongoRepository使用基本的CRUD函数，但我没有在代码中关闭mongo连接，因为我以为spring data mongodb会自己关闭它，但它会继续打开新连接，而不是关闭它们。这些太多的连接导致我的应用程序崩溃，我必须一次又一次（每天两次）重新启动tomcat来克服这个问题。

注意：Spring应用

    2015-07-17T01:31:20.068-0400 I NETWORK  [conn3645] end connection 127.0.0.1:55302 (2583 connections now open)
    2015-07-17T01:31:20.071-0400 I NETWORK  [conn1713] end connection 127.0.0.1:48174 (2352 connections now open)
    2015-07-17T01:31:20.072-0400 I NETWORK  [conn2250] end connection 127.0.0.1:51017 (2325 connections now open)
    2015-07-17T01:31:20.072-0400 I NETWORK  [conn2149] end connection 127.0.0.1:50670 (2320 connections now open)

这是重启tomcat后的日志

2015-07-17T01:31:29.994-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:53599 #3984 (1 connection now open)
2015-07-17T01:31:33.263-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:53740 #3985 (2 connections now open)
2015-07-17T01:31:33.580-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:53750 #3986 (3 connections now open)
2015-07-17T02:10:06.477-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50086 #3987 (4 connections now open)
2015-07-17T02:10:06.590-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50090 #3988 (5 connections now open)
2015-07-17T02:10:11.682-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50242 #3989 (6 connections now open)
2015-07-17T02:10:11.780-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50244 #3990 (7 connections now open)
2015-07-17T02:10:12.545-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50255 #3991 (8 connections now open)
2015-07-17T02:10:12.605-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50258 #3992 (9 connections now open)
2015-07-17T02:10:13.413-0400 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:50299 #3993 (10 connections now open)

每当我向应用发送请求时，它就会增加。

这是坠机后的tomcat日志-

Jul 16, 2015 3:59:57 PM org.apache.tomcat.util.net.JIoEndpoint$Acceptor run
SEVERE: Socket accept failed
java.net.SocketException: Too many open files
    at java.net.PlainSocketImpl.socketAccept(Native Method)
    at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:404)
    at java.net.ServerSocket.implAccept(ServerSocket.java:545)
    at java.net.ServerSocket.accept(ServerSocket.java:513)
    at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60)
    at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:222)
    at java.lang.Thread.null(Unknown Source)

它是一个开发服务器，每分钟的流量小于10次呼叫。

有人建议我如何关闭这些连接吗？

Answer 1

我也遇到了同样的问题，因为使用new而不是autowiring，如果您手动执行此操作，请使用

 mongoDBObject.getDB().getMongo().close().

Answer 2

Spring不会自动关闭连接。只有当上下文关闭时，它才会关闭连接。

看看这篇文章。

您最好按照本文配置mongo选项

但您必须根据应用程序流量对这些值进行微调。

<beans>

  <mongo:mongo host="localhost" port="27017">
    <mongo:options connections-per-host="8"
                   threads-allowed-to-block-for-connection-multiplier="4"
                   connect-timeout="1000"
                   max-wait-time="1500}"
                   auto-connect-retry="true"
                   socket-keep-alive="true"
                   socket-timeout="1500"
                   slave-ok="true"
                   write-number="1"
                   write-timeout="0"
                   write-fsync="true"/>
  </mongo:mongo/>

</beans>

Answer 3

MongoClient维护一个连接池，您可以使用MongoClient打开一次Db连接，然后在整个应用程序中重用它，因为建立新的TCP连接在时间和内存方面都很昂贵，这就是为什么要重用连接。此外，一个新的连接也会导致在MongoDB上使用Db上的内存创建一个新线程。

• 需要注意的是，connectToMongo方法中存在竞争条件。您需要同步对该方法的访问，以确保最多创建一个MongoClient实例