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Re: HttpManager hangs.

From: Harmeet <harmeet@kodemuse.com>
Date: Thu, 16 Aug 2001 08:33:29 -0700
Message-ID: <012a01c12668$cf95cd80$a77ba8c0@Harmeet>
To: "Owen Roberts" <oroberts@baltimore.com>
Cc: <www-jigsaw@w3.org>
I did the test with timing for
http://www.yahoo.com/
http://www.kodemuse.com/index.html   (this is my LAN Connected Site)
http://www.google.com/

http://www.yahoo.com/
tried 30 iterations, total time=190 ms, did not hang

http://www.kodemuse.com/index.html
tried 30 iterations, total time=21 ms, did not hang

http://www.google.com/
tried 30 iterations, stopped after 5. :-(

Tried again
http://www.google.com/
tried 30 iterations, stopped after 6. :-(

I am running on Windows 2000 and JDK 1.3.

I have had one similar experience with Jigsaw:
In my past life, Jigsaw used to  hang when serving static files in a stress
test/production environment. The workaround was use Servlets instead of the
default Resource Handlers. It worked well.
Not sure what the right solution for HttpManager is. Maybe you could switch
of some code there that you don't find useful/easy to follow and try.

Harmeet
----- Original Message -----
From: "Owen Roberts" <oroberts@baltimore.com>
To: "Harmeet" <harmeet@kodemuse.com>
Sent: Thursday, August 16, 2001 3:01 AM
Subject: RE: HttpManager hangs.


> Hi Harmeet,
>
> Thanks very much for replying! Was the problem with Google the same as I
> experienced?
>
> I changed the code as you suggested.
> With http://www.yahoo.com/ it's fine - and does the 30 iterations.
> With http://www.google.com/, however it stops after 5.
> Also, with localhost, using a jigsaw server, it also stops after 5.
> And, with an internal lan web server running IIS, it stops after 5.
>
> This implies to me that when this operation is done in a fast loop, it
> hangs. Yahoo is a slower web page than the other three examples. I am
pretty
> sure this is a bug as it occurs with multiple server types and locations
> that are fast.
>
> Can you please try the operation with a local server? If you place these 2
> files in the Jigsaw directory on a Win32 machine, all you have to do is
hit
> the batch file... although it feels like you are running Linux? :-)
>
> Thanks very much,
> OWen
>
>
> > -----Original Message-----
> > From: Harmeet [mailto:harmeet@kodemuse.com]
> > Sent: 16 August 2001 7:36
> > To: Owen Roberts
> > Subject: Re: HttpManager hangs.
> >
> >
> > I ran a slightly diffierent test, and it worked.
> > I used this jpython code to run the test. Thought it was simpler and
> > functionally equivalent
> >
> > def jighttptest():
> >     from org.w3c.www.protocol.http import HttpManager
> >     from java.net import URL
> >     mgr = HttpManager.getManager()
> >     u = URL('http://www.yahoo.com/')
> >     for i in range(0,30):
> >         req = mgr.createRequest() ;
> >         req.setMethod('GET')
> >         req.setURL(u)
> >         reply = mgr.runRequest(req);
> >         print i,'done'
> >
> > This test worked fine. I had a problem with google, but I
> > doubt that has
> > anything to do with Jigsaw.
> >
> > Harmeet
> > ----- Original Message -----
> > From: "Owen Roberts" <oroberts@baltimore.com>
> > To: <www-jigsaw@w3.org>
> > Sent: Wednesday, August 15, 2001 5:41 AM
> > Subject: HttpManager hangs.
> >
> >
> > > Hi all,
> > >
> > > I am having real difficulty working out why HttpManager
> > from Jigsaw 2.2.0
> > is
> > > hanging on me. Can I ask a huge favour of the list - this
> > should only take
> > > two minutes.
> > > Could someone else that is using Jigsaw 2.2.0 please
> > confirm that they can
> > > reproduce this problem?
> > > Below are two files - i didn't attach them as Im not sure
> > of attachment
> > > etiquette.
> > > The first will build the second under Win32 if you recreate
> > these files
> > > under the root of your Jigsaw installation directory.
> > >
> > > The output should be 30 iterations of the loop, GETting a
> > known fast web
> > > page.
> > > HOwever, only a few iterations are printed out before the
> > program hangs
> > > inside manager.runRequest();
> > >
> > > I would be _very_ appreciative of anyone who can confirm
> > this is a bug so
> > I
> > > can raise it with the Jigsaw team.
> > >
> > > Thanks _very_ much for your time,
> > > Owen Roberts.
> > >
> > >
> > > -------------------testProblem.bat----------------
> > > set CLASSPATH=classes\jigsaw.jar;.;
> > > javac -classpath %CLASSPATH% testProblem.java
> > > java -classpath %CLASSPATH% testProblem
> > > ----------------------end testProblem.bat--------------
> > >
> > > -----------------start testProblem.java-------
> > > import java.lang.String;
> > > import java.net.*;
> > > import java.io.*;
> > > import java.util.*;
> > > import org.w3c.www.protocol.http.HttpManager;
> > > import org.w3c.www.protocol.http.HttpException;
> > > import org.w3c.www.protocol.http.Reply;
> > > import org.w3c.www.protocol.http.Request;
> > > import org.w3c.www.http.HTTP;
> > > import org.w3c.www.mime.MimeType;
> > >
> > >
> > > public final class testProblem
> > > {
> > >     public static void main (String[] args)
> > >     {
> > >         HttpManager     manager = HttpManager.getManager() ;
> > >         for (int i=0; i<30; i++)
> > >         {
> > >             try
> > >             {
> > >                 Request request = manager.createRequest() ;
> > >                 request.setMethod("GET") ;
> > >                 request.setURL(new URL("http://www.google.com/"));
> > >                 System.out.println("start a get...");
> > >                 Reply    reply = manager.runRequest(request) ;
> > >                 System.out.println("complete a get...");
> > >             }
> > >             catch(MalformedURLException e)
> > >             {
> > >                 System.out.println("caught: " + e.toString());
> > >             }
> > >             catch(HttpException e)
> > >             {
> > >                 System.out.println("caught: " + e.toString());
> > >             }
> > >             catch(IOException e)
> > >             {
> > >                 System.out.println("caught: " + e.toString());
> > >             }
> > >         }
> > >     }
> > > }
> > > ----------------------------end testProblem.java-----------------
> > >
> > >
> > >
> > >
> > >
> > >
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Received on Thursday, 16 August 2001 11:41:09 GMT

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