BindException：客户端套接字上已经使用的地址？ [英] BindException: address already in use on a client socket?

问题描述

我有一个客户端 - 服务器分层架构，客户端向服务器发出类似RPC的请求。我正在使用Tomcat来托管servlet，并使用Apache HttpClient向它发出请求。

I've got a client-server tiered architecture with the client making RPC-like requests to the server. I'm using Tomcat to host the servlets, and the Apache HttpClient to make requests to it.

我的代码是这样的：

    private static final HttpConnectionManager CONN_MGR = new MultiThreadedHttpConnectionManager();
    final GetMethod get = new GetMethod();
    final HttpClient httpClient = new HttpClient(CONN_MGR);
    get.getParams().setCookiePolicy(CookiePolicy.IGNORE_COOKIES);
    get.getParams().setParameter(HttpMethodParams.USER_AGENT, USER_AGENT);

    get.setQueryString(encodedParams);
    int responseCode;
    try {
        responseCode = httpClient.executeMethod(get);
    } catch (final IOException e) {
        ...
    }
    if (responseCode != 200)
        throw new Exception(...);

    String responseHTML;
    try {
        responseHTML = get.getResponseBodyAsString(100*1024*1024);
    } catch (final IOException e) {
        ...
    }
    return responseHTML;

它在轻负载的环境中运行良好，但是当我每秒发出数百个请求时我开始看到这个 -

It works great in a lightly-loaded environment, but when I'm making hundreds of requests per second I start to see this -

Caused by: java.net.BindException: Address already in use
    at java.net.PlainSocketImpl.socketBind(Native Method)
    at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:336)
    at java.net.Socket.bind(Socket.java:588)
    at java.net.Socket.<init>(Socket.java:387)
    at java.net.Socket.<init>(Socket.java:263)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
    at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)

有关如何解决此问题的任何想法？我猜这与客户试图重用短暂的客户端端口有关，但为什么会发生这种情况/如何解决？
谢谢！

Any thoughts on how to fix this? I'm guessing it's something to do with the client trying to reuse the ephemeral client ports, but why is this happening / how can I fix it? Thanks!

推荐答案

事实证明问题是其他一个HttpClient实例意外没有使用我实例化了MultiThreadedHttpConnectionManager，所以我实际上根本没有速率限制。修复此问题修复了抛出的异常。

So it turns out the problem was that one of the other HttpClient instances accidentally wasn't using the MultiThreadedHttpConnectionManager I instantiated, so I effectively had no rate limiting at all. Fixing this problem fixed the exception being thrown.

感谢所有建议！

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