[英]“Connection reset” exception with Apache HttpClient 4.5 on Mac
我需要最多1000個線程來同時發送HTTP請求。 但是在Mac上似乎我達到了一些限制,這導致Apache HTTPClient返回異常:
INFO: I/O exception (java.net.SocketException) caught when processing request to {}->http://my.url:80: Connection reset
限制似乎在200到300個並發連接之間。
我創建了一個簡單的應用程序,即使使用該應用程序也能夠重現該問題:
import java.io.IOException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
public class App implements Runnable
{
private static final int NUMBER_THREADS = 1000;
public static void main( String[] args )
{
Thread[] threads = new Thread[NUMBER_THREADS];
for(int i = 0; i < NUMBER_THREADS; i++)
{
threads[i] = new Thread(new App());
}
for(int i = 0; i < NUMBER_THREADS; i++)
{
threads[i].start();
}
}
public void run()
{
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpget = new HttpGet("http://my.url/test.html");
CloseableHttpResponse response = null;
try
{
System.out.println( System.nanoTime() + " " + Thread.currentThread().getName() + " started" );
response = httpclient.execute(httpget);
System.out.println( System.nanoTime() + " " + Thread.currentThread().getName() + " finished" );
}
catch (ClientProtocolException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
try
{
if(response != null)
{
response.close();
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
我更新了一些Mac設置,但這無濟於事:
> sysctl -a | grep files
kern.maxfiles = 12288
kern.maxfilesperproc = 10240
kern.maxfiles: 12288
kern.maxfilesperproc: 10240
kern.num_files: 3202
> ulimit -n 10240
> ulimit -n
10240
> sysctl -a | grep somax
kern.ipc.somaxconn: 128
> sudo sysctl -w kern.ipc.somaxconn=2048
Password:
kern.ipc.somaxconn: 128 -> 2048
> sysctl -a | grep somax
kern.ipc.somaxconn: 2048
所以我想了解這個限制來自何處? OsX / Apache HttpClient本身? 並且可以控制它嗎?
提前致謝。
問題確實存在於maxfiles中,但是我沒有正確更改它們。 此文章幫助我通過顯示更新在Mac OS X優勝美地/埃爾卡皮坦文件限制的正確程序來解決它。
創建和更新/Library/LaunchDaemons/limit.maxfiles.plist文件:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>limit.maxfiles</string> <key>ProgramArguments</key> <array> <string>launchctl</string> <string>limit</string> <string>maxfiles</string> <string>65536</string> <string>65536</string> </array> <key>RunAtLoad</key> <true/> <key>ServiceIPC</key> <false/> </dict> </plist>
創建/Library/LaunchDaemons/limit.maxproc.plist文件:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple/DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>limit.maxproc</string> <key>ProgramArguments</key> <array> <string>launchctl</string> <string>limit</string> <string>maxproc</string> <string>2048</string> <string>2048</string> </array> <key>RunAtLoad</key> <true /> <key>ServiceIPC</key> <false /> </dict>
添加.bashprofile並包含以下幾行:
ulimit -n 65536 ulimit -u 2048
重新啟動系統
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