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Jean-Luc Rochat wrote:
> Ludovic Bailly wrote:
>
> > When one of the JServ doesn't respond, if y make a reload then it works
> > assuming the query goes to a JServ which is working.
> > If I wait for a response, I get a message like : "document contains no data"
>
> timeout (default=300 sec) between apache & jserv maybe ?
>
> > I have to kill the JServ and run it again, then mod_jserv find it and use it
> > when load balancing.
> > But It seems that mod_jserv doesn't detect that a JServ is down and continue
> > to send requests to it.
>
> probably, it's not down, it's busy. and if the server is still alive,
> the watchdog process could put it back alive in < 10 seconds.
What do you mean by busy ?
The server seems to be alive (telnet is ok) and it never get back !
> > You said that telnet is not sufficient to know if a JServ engine is
> > "completly" up,
> > what is the right way to know it ?
>
> examine the logs
> hit a helloworld servlet
I've just try this :
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CountHit extends HttpServlet {
static int i=0;
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void doPost (HttpServletRequest Request, HttpServletResponse Response)
throws ServletException, IOException {
doGet(Request, Response);
}
public void doGet (HttpServletRequest Request, HttpServletResponse Response)
throws ServletException, IOException {
char[] C = new char[1024 * 20];
PrintWriter out = Response.getWriter();
Response.setContentType("text/html");
i++;
out.print("<html><head>");
out.print("<META HTTP-EQUIV=\"Pragma\" CONTENT=\"no cache\">");
out.print("</head><body>");
out.print("Remote Adresse : "+Request.getRemoteAddr()+" <br>");
out.print(" nb hit "+i+"<br>");
out.print(C);
out.print("</body></html>");
out.close();
System.err.println("CountHit : " + i);
}
}
and run ab -n 1500 -c 500 http://xxx/yyy/CountHit
I've two computers :
one bi P3 450 and one P3 450 (running apache)
during the test with ab, I get one JServ busy
if I try a new test, the JServ which was busy doesn't respond
It seems to be done forever ...
Thanks.
Ludo.
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