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From Jestin Jean-Francois <Jean-Francois.Jes...@srit.siemens.fr>
Subject RE: apache 1.3.12 and tomcat 3.3-m2 connection problem ??
Date Tue, 27 Mar 2001 06:51:32 GMT
Hello,
I agree the idea of the pushlet is a bit confusing because it uses http (a non real time protocol)
to do pseudo real-time job, 
but real-time is always more "hungry" than other technology (think about streaming !! ).
On the other hand having pseudo real-time monitoring over standard http is also very interesting
!
It's look like another dilemma ;-)
But
>>>BTW, I'll see where the problem could be in mod_jk ;-)
Could you give me more information about the problem ?

Thank you very much



> -----Original Message-----
> From:	GOMEZ Henri [SMTP:hgomez@slib.fr]
> Sent:	Monday, March 26, 2001 6:10 PM
> To:	tomcat-dev@jakarta.apache.org
> Subject:	RE: apache 1.3.12 and tomcat 3.3-m2 connection problem ??
> 
> Hi,
> 
> I take a look at pushlet and find it very bad design.
> 
> Using opened http connections to do real-time job is
> not realist.
> 
> In that case you keep an :
> 
> - one OS (job/thread)
> - one ajp13 connection
> - one tomcat thread.
> 
> Imagine if you got > 256 concurrents connexions !
> 
> A better alternative will be to use a custom made network
> protocol.
> 
> BTW, I'll see where the problem could be in mod_jk ;-)
> 
> 
> "Entre truands, les b> énéfices, ça se partage, la réclusion, ça
> s'additionne."
> -- Michel Audiard
>  
> 
> >-----Original Message-----
> >From: Jestin Jean-Francois 
> >[mailto:Jean-Francois.Jestin@srit.siemens.fr]
> >Sent: Monday, March 26, 2001 5:34 PM
> >To: 'tomcat-dev@jakarta.apache.org'
> >Subject: RE: apache 1.3.12 and tomcat 3.3-m2 connection problem ??
> >
> >
> >here are 2 articles speaking about the pushlet
> >
> >http://www.javaworld.com/javaworld/jw-03-2000/jw-03-pushlet.html
> >
> >http://www.javaworld.com/javaworld/jw-03-2000/jw-03-pushlet-2.html
> >
> >here is a very simple sample pushlet :
> >
> >
> >import javax.servlet.*;
> >import javax.servlet.http.*;
> >import java.io.*;
> >
> >public class SimplePushlet extends HttpServlet
> >{
> >    public void doGet(HttpServletRequest request, 
> >HttpServletResponse response)  throws ServletException, IOException {
> >
> >        ObjectOutputStream out = new ObjectOutputStream 
> >(response.getOutputStream());
> >        response.setContentType("text/plain");   
> >        
> >        String start = "Http connection opened";
> >        
> >        out.write(start.getBytes());
> >        out.flush();
> >   
> >        try {
> >            for (int cnt=1; cnt > 0; cnt++) {
> >                Thread.sleep(1000);
> >                
> >                String iter = "event=" + cnt + "\n";
> >                out.write(iter.getBytes());
> >                out.flush();
> >                System.out.println("event=" + cnt + "pushed.\n");
> >            }
> >        } catch (Exception e) {
> >            System.out.println("error:"+e);
> >        }
> >        
> >        out.close();
> >    }
> >}
> >
> >You may use netscape as browser or ie if you don't care about 
> >waiting 15 pushes.
> >
> >Thank you for your help.
> >
> >
> >
> >
> >
> >
> >
> >> >-----Original Message-----
> >> >From: Jestin Jean-Francois 
> >> >[mailto:Jean-Francois.Jestin@srit.siemens.fr]
> >> >Sent: Monday, March 26, 2001 4:01 PM
> >> >To: 'tomcat-dev@jakarta.apache.org'; 
> >'tomcat-user@jakarta.apache.org'
> >> >Subject: apache 1.3.12 and tomcat 3.3-m2 connection problem ??
> >> >
> >> >
> >> >Hello,
> >> >
> >> >I'm currently using apache 1.3.12(mod_jk) and tomcat 3.3-m2 
> >> >under solaris 2.6 talking ajp13
> >> >
> >> >Everything works fine except that I encounter sometime an 
> >> >Internal Server Error if I don't restart Apache each time I 
> >> >restart tomcat. Is there a fix for that problem ?
> >> >
> >> >On the other hand I use a server push mechanism (called 
> >> >pushlet) - that's why I use milestone build of 3.3 (not 
> >> >working under 3.2.1)- it works also fine (what a beautiful 
> >> >life !) except that sometime (!!??) the servlet (pushlet) > 
> >> >doesn't detect the end of the connection (Browser killed) 
> >> >between tomcat and apache
> >> >
> >> >looking at the mod_jk log gives the following :
> >> >
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (203)]: connection_tcp_get_message: Error - 
> >> >jk_tcp_socket_recvfull failed
> >> >[jk_ajp13_worker.c (623)]: Error reading request
> >> >[jk_ajp13_worker.c (203)]: connection_tcp_get_message: Error - 
> >> >jk_tcp_socket_recvfull failed
> >> >[jk_ajp13_worker.c (623)]: Error reading request
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >[jk_ajp13_worker.c (325)]: Error ajp13_process_callback - 
> >write failed
> >> >
> >> >Is there also a fix for that or these problems ?
> >> >
> >> >Thank you very for your answer and your great job !
> >> >
> >> >
> >> >****************************************************
> >> >Jean-Fran> çois JESTIN
> >> >****************************************************
> >> >
> >> >
> >> >
> >

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