Spring Data MongoDB无法关闭MongoDB连接 [英] Spring data mongodb not closing mongodb connections
问题描述
我在我的Web应用程序中使用带有spring-webmvc框架的spring-data-mongodb(1.7.0.RELEASE).我正在使用使用mongoRepository的基本CRUD函数，但是我没有在代码中关闭mongo连接，因为我认为spring-data-mongodb会自行关闭它，但是它会继续打开新连接而不关闭它们.这些太多的连接使我的应用程序崩溃，我不得不一次又一次(一天两次)重新启动tomcat来解决此问题.
I am using spring-data-mongodb (1.7.0.RELEASE) with spring-webmvc framework for my web application. I am using basic CRUD functions using mongoRepository but i am not closing mongo connections in my code cause i thought that spring-data-mongodb will close it by itself, But it keeps on opening new connections and not closing them. These too many connections ares crashing my application and i have to restart tomcat again and again (twice a day) to overcome this.
注意:Spring Application& mongod在同一台服务器上. 这是崩溃后的日志-
Note: Spring Application & mongod is on same server. This is log just after crashing -
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)
这是重新启动tomcat之后的日志
This is log after restarting tomcat
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.
it increase whenever i sends request to the app.
这是崩溃后的tomcat日志-
And this is the tomcat log just after crash -
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)
它是开发服务器，每分钟流量少于10个呼叫.
its a development server, it have traffic lesser than 10 call per minute.
请提出一些建议，我应该如何关闭这些连接?
Someone please suggest how should i close these connections ?
推荐答案
MongoClient维护一个连接池，您一次使用MongoClient打开一个Db连接，并在您的应用程序中重复使用它，因为建立新的TCP连接在时间和内存上都是昂贵的明智的做法是重复使用连接的原因.另外，新的连接也会导致使用Db上的内存在MongoDB上创建新的线程.
The MongoClient maintains a connection pool,You open a Db connection once with MongoClient and reuse it across your application because setting up a new TCP connection is EXPENSIVE timewise and memory wise that's why you reuse connections. Also a new connection will cause a new Thread to be created on MongoDB using memory on the Db as well.
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要注意的一点是，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.
- point to be noted that there is a race condition in the connectToMongo method. You need to synchronize access to that method to ensure that at most one instance of MongoClient is ever created.
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