java.net.SocketException: Broken pipe

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生產上遇到一個問題，socket發生Broken pipe錯誤，如下

這個問題跟蹤了好幾個月，始終沒有模擬出為什么會發生Broken pipe。最后發現，是客戶端設置了超時時間setSoTimeout,也是神坑。

下面的例子可以完整的還原出Broken Pipe錯誤，請在linux底下運行。

Client:

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

public class Client {

    public static void main(String[] args) {
        Socket s = null;
        try {
            s = new Socket("127.0.0.1", 3113);
            s.setSoTimeout(5000);

            DataOutputStream out = new DataOutputStream(
                    s.getOutputStream());


            //client->server
            out.write("1111 from client".getBytes());


            // server->client
            DataInputStream in = new DataInputStream(s.getInputStream());
            byte[] bytes = new byte[1024];
            int len = in.read(bytes);

            System.out.println("client:" + new String(bytes, 0, len));

            out.write("2222 from client".getBytes());


        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (s != null) {
                try {
                    s.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

Server:

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

	public static void main(String[] args) {
	        try {
	            ServerSocket ss = new ServerSocket(3113);
	            Socket s = ss.accept();
	            //client->server
				DataInputStream is = new DataInputStream(s.getInputStream());
	            byte[] buf =new byte[1024];
	            int len = is.read(buf);
	            System.out.println("recv:"+new String(buf,0,len));
	
	            Thread.sleep(10000);

				//server->client
	            s.getOutputStream().write("1111 server".getBytes());
	


                //client->server
				DataInputStream in = new DataInputStream(s.getInputStream());
				byte[] bytes = new byte[1024];
				int length = in.read(bytes);

				try {
					System.out.println("recv2:"+new String(bytes,0,length));
				} catch (Exception e) {
					e.printStackTrace();

					System.out.println("--------------");

					DataOutputStream out = new DataOutputStream(s.getOutputStream());
					try {
						out.write("error write ".getBytes());
					} catch (IOException e1) {
						System.out.println("==============================");
						e1.printStackTrace();
					}
				}

			}catch (Exception e){
				System.out.println(e.getStackTrace());
	            e.printStackTrace();
	        }
	    }
}