使用JMeter与1000位用户进行负载测试时，Apache Tomcat Connection Refused错误 [英] Apache Tomcat Connection Refused error while load testing with 1000 users using JMeter

问题描述

我已经在linux和Apache Tomcat 7.0.42中部署了Java EE应用程序

I have deployed a Java EE application in linux and Apache Tomcat 7.0.42

当我使用JMeter对100个用户进行负载测试(并发100个线程请求)时，一切都正常运行

Everything works fine when I load test for 100 users using JMeter(concurrent 100 threads requests)

但是，一旦我将用户(或线程数)更改为1000个服务器，它就会被阻塞，并且它会在〜600之后为所有请求给出连接被拒绝"错误.

But as soon as I change the users(or number of threads) to 1000 server is choked and it gives "Connection refused" error for all the requests after ~600.

我已经在应用程序中进行了所有的微调，它现在更多的是静态网页，即使这样它也会返回错误.

I have done all fine tuning in the application and it is more of of a static web page now, even then it comes back with error.

服务器配置:Ubuntu，8个vCPU/32 GB RAM/960GB HD

Server Configuration: Ubuntu, 8 vCPU / 32 GB RAM / 960 GB HD

PS:同一应用程序在AWS(Amazon Web Services)中运行良好，因此您可以排除运行JMeter(client)的计算机出现任何问题

PS: The same application works well in AWS(Amazon Web Services), so you can rule out any problem with my machine running JMeter(client)

    org.apache.http.conn.HttpHostConnectException: Connection to http://a.b.c.d:8080 refused
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:190)
    at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
    at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:645)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:480)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:286)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:62)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1088)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1077)
    at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:428)
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:256)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
    ... 12 more

推荐答案

尝试在server.xml中调整http连接器的maxThreads和acceptCount属性:

Try adjusting the maxThreads and acceptCount attributes of the http connector in server.xml:

在此期间，每个传入请求都需要一个线程 要求.如果收到的并发请求多于请求数 由当前可用的请求处理线程处理， 将会创建更多线程，直到配置的最大数量( maxThreads 属性的值).如果同时进行 收到请求，它们堆积在服务器插座内 由连接器创建，直到配置的最大值( acceptCount 属性).任何其他同时请求将 收到连接被拒绝"错误，直到有可用资源 处理它们.

Each incoming request requires a thread for the duration of that request. If more simultaneous requests are received than can be handled by the currently available request processing threads, additional threads will be created up to the configured maximum (the value of the maxThreads attribute). If still more simultaneous requests are received, they are stacked up inside the server socket created by the Connector, up to the configured maximum (the value of the acceptCount attribute). Any further simultaneous requests will receive "connection refused" errors, until resources are available to process them.

参考: http://tomcat.apache.org/tomcat- 7.0-doc/config/http.html

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