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MongoDB 查询超时异常 SocketTimeoutException

Jun 07, 2016 pm 04:08 PM

MongoDB 查询超时异常 SocketTimeoutException

在对超过百万条记录的集合进行聚合操作。

DBObject match=(DBObject)JSON.parse("{$match:{logType:{'$in':[5,9]}}}");
DBObject group=(DBObject)JSON.parse("{$group:{'_id':'$domainUrl','count':{'$sum':1}}}");
AggregationOutput output = logCollection.aggregate(match,group);
 

偶尔会发生Read timed out 异常。

com.mongodb.MongoException$Network: Read operation to server /192.168.10.202:27017 failed on database adLogTable
    at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:253)
    at com.mongodb.DB.command(DB.java:261)
    at com.mongodb.DB.command(DB.java:243)    ...
Caused by: java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:152)
 

通过多次测试,发现执行一次聚合平均时间为5s,超过5s时就会报错!

然后查看MongoDB的配置信息:

socket-timeout="5000"  //5s

socket-timeout的默认配置为0,也就是没有限制。

没有超时限制,,系统出了问题也不容易发现,应该根据实际情况,给出合理的超时时间。

通过多次测试发现最长执行时间为6秒,就把超时时间设置成了10000。

socket-timeout="10000"  //10s

注意:MongoDB在与Spring整合时,如果要配置多个MongDB源,只会启用最后一个配置。

应该把参数配置信息存储在properties文件中。


            threads-allowed-to-block-for-connection-multiplier="100"
        connect-timeout="1000"
        max-wait-time="1000"
        auto-connect-retry="true"
        socket-keep-alive="true"
        socket-timeout="10000"
        slave-ok="true"
        write-number="1"
        write-timeout="0"
        write-fsync="true" />

通过Java API获取配置参数

DBCollection logCollection = mongoTemplate.getCollection(collName);
MongoOptions mongoOptions = logCollection.getDB().getMongo().getMongoOptions();
System.out.println(mongoOptions.getSocketTimeout());

最后一点:  ConnectionTimeOut和SocketTimeOut的区别:

  一次完整的请求包括三个阶段:1、建立连接 2、数据传输 3、断开连接

  如果与服务器(这里指数据库)请求建立连接的时间超过ConnectionTimeOut,就会抛 ConnectionTimeOutException,即服务器连接超时,没有在规定的时间内建立连接。

    如果与服务器连接成功,就开始数据传输了。

    如果服务器处理数据用时过长,超过了SocketTimeOut,就会抛出SocketTimeOutExceptin,即服务器响应超时,服务器没有在规定的时间内返回给客户端数据。

CentOS 编译安装 MongoDB与mongoDB的php扩展

CentOS 6 使用 yum 安装MongoDB及服务器端配置

Ubuntu 13.04下安装MongoDB2.4.3

MongoDB入门必读(概念与实战并重)

Ubunu 14.04下MongoDB的安装指南

《MongoDB 权威指南》(MongoDB: The Definitive Guide)英文文字版[PDF]

Nagios监控MongoDB分片集群服务实战

基于CentOS 6.5操作系统搭建MongoDB服务

MongoDB 的详细介绍:请点这里
MongoDB 的下载地址:请点这里

本文永久更新链接地址:

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