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Re: HttpManager hangs.

From: Yves Lafon <ylafon@w3.org>
Date: Thu, 16 Aug 2001 17:48:23 +0200 (MET DST)
To: Harmeet <harmeet@kodemuse.com>
cc: Owen Roberts <oroberts@baltimore.com>, <www-jigsaw@w3.org>
Message-ID: <Pine.GSO.4.33.0108161746060.14235-100000@tarantula.inria.fr>
On Thu, 16 Aug 2001, Harmeet wrote:

> 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. :-(

Would it be possible th have a thread dump when that happens?

> 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.

Same here, If it is due to a locking problem, having a stack trace may
help chasing it. Note that it never happened here while doing stress
tests.

> 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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-- 
Yves Lafon - W3C
"Baroula que barouleras, au tiéu toujou t'entourneras."
Received on Thursday, 16 August 2001 11:48:27 GMT

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