Http problems under load

Question

Running WL 51 w. SP3, Solaris 2.7, java 1.2.1, and using loadrunner to
simulate 160 users doing http GETs directly to the weblogic http server
(port 8001). There are a number of errors showing up in the weblogic
log that I don't understand.
First, I get a few of:
Tue Aug 08 18:13:45 GMT+00:00 2000:<E> <HTTP> Servlet request terminated
with IOException:
java.net.ProtocolException: Didn't meet stated Content-Length, wrote:
'24576' bytes instead of stated: '99596' bytes.
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at java.io.IOException.<init>(Compiled Code)
at java.net.ProtocolException.<init>(Compiled Code)
at
weblogic.servlet.internal.ServletOutputStreamImpl.finish(Compiled Code)
at
weblogic.servlet.internal.ServletContextManager.invokeServlet(Compiled
Code)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(Compiled
Code)
at weblogic.socket.MuxableSocketHTTP.execute(Compiled Code)
at weblogic.kernel.ExecuteThread.run(Compiled Code)
Then a bunch of:
<W> <ListenThread> Connection rejected: 'Login timed out after: '5000'
ms on socket ...
followed by:
Tue Aug 08 20:12:30 GMT+00:00 2000:<E> <Posix Performance Pack> Failure
in processSockets()
java.net.SocketException: Connection reset by peer: Connection reset by
peer
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.socketRead(Compiled Code)
at java.net.SocketInputStream.read(Compiled Code)
at weblogic.socket.PosixSocketMuxer.processSockets(Compiled
Code)
at
weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:23)
at weblogic.kernel.ExecuteThread.run(Compiled Code)
There are 4 client machines each running 40 clients, and these errors
seem to only affect one of the client machines.
If I run the test just using that machine, it runs fine - it only seems
to show up under load.
I don't know if it's a coincidence or not, but the numbers seem too
regular - I get (in order):
1480 Connection rejected: messages
40 <Posix Performance Pack> Failure in processSockets()
40 Connection rejected: messages
80 <Posix Performance Pack> Failure in processSockets()
240 Connection rejected: messages
30 <Posix Performance Pack> Failure in processSockets()
Thoughts? Solutions?

Answer 1

Chris Fullerton wrote:
>
Running WL 51 w. SP3, Solaris 2.7, java 1.2.1, and using loadrunner to
simulate 160 users doing http GETs directly to the weblogic http server
(port 8001). There are a number of errors showing up in the weblogic
log that I don't understand.
First, I get a few of:
Tue Aug 08 18:13:45 GMT+00:00 2000:<E> <HTTP> Servlet request terminated
with IOException:
java.net.ProtocolException: Didn't meet stated Content-Length, wrote:
'24576' bytes instead of stated: '99596' bytes.In the last week I tried to do same things. I wrote my own tester (a
simple http-client,
multi-thread etc.) to see whats happen' when 10000 clients POSTs an
HTTP-form. And of course
I got the same exception, because I forgot to set the correct
Content-length in the CLIENT SIDE.
My first HTTP-header looks like this:
POST /pqr HTTP/1.0<CRLF>
Content-type: application/x-www-form-urlencoded<CRLF>
Content-length: 17<CRLF><CRLF>
xml=<blabla></blabla>
And it was really bad: I counted only the xml-like string, instead of
the full data (incl. "xml=")
When I corrected it was goood!
So, I think the source of Your problem isn't in the WS-side: try to
check your client...
And Your client can't close the connection before sending all data!!!
Best Regards/Üdvözlettel:
Oláh, Károly
i2c Systems & Consulting