Hi there,
I'm having very similar problem on Solaris 8 JDK 1.3.1_01and Tomcat 4.0.3.
It was even worst with JDK 1.3.1_03-b03 since java was crashing with bug
report info.
I spend sometime to investigate the problem and I discovered the following:
1. apaches CPU usage grows as it is possible;
2. tomcat CPU usage increases also;
3. there is not any communication between apache and the web browser
requested the page (maybe it did timeout?!);
4. there is not any error reported neither in tomcat nor in apaches error
logs;
5. mod status is reporting the hanging process like:
Srv PID Acc M CPU SS Req Conn Child Slot Host
VHost Request
7-0 29328 0/399/1401 W 3.45 53090 0 0.0 4.71 13.22
205.188.195.184 myhost POST /myapp HTTP/1.0
6. the request is logged as 200 in apache access log (this I'm not 100% sure
and is still under investigation. I'll know it for sure next time when this
problem happened again.);
7. there is a constant communication between apache and tomcat!
netstat report:
java 19402 tomcat 25u IPv4 0x300013e9088 0x12b427de TCP
myhost:25181->myhost:36568 (ESTABLISHED)
java 19402 tomcat 28u IPv4 0x3000141d0e8 0x1325c0c2 TCP
myhost:25181->myhost:36686 (ESTABLISHED)
java 19402 tomcat 29u IPv4 0x3000041abd8 0x10683a68 TCP
myhost:25181->myhost:36574 (ESTABLISHED)
I tryed to trace this data exchange with tcpdump and ngrep without
any success (yes, loopback can not be reached under Solaris, but I didn't
succeed to trace the regular interface too which is driving me crazy!)
The communication can be traced to some extend using truss.
Below is an truss trace:
0.0703 recv(26, 0xFFBEE4A0, 4, 0) = 4
0xFFBEE4A0: " A B\003"
0.0710 recv(26, 0x0025D888, 3, 0) = 3
0x0025D888: "061FFA"
0.0715 send(26, 0x0025F890, 4, 0) = 4
0x0025F890: "12 4\0\0"
0.0720 recv(26, 0xFFBEE4A0, 4, 0) = 4
0xFFBEE4A0: " A B\003"
0.0723 recv(26, 0x0025D888, 3, 0) = 3
0x0025D888: "061FFA"
0.0727 send(26, 0x0025F890, 4, 0) = 4
0x0025F890: "12 4\0\0"
The above is in infinite loop.
8. killing the bad http process is helping:
The result after kill:
java.lang.NullPointerException - in the application followed by:
Ajp13Processor[25181][17] process: invoke
java.io.IOException: Broken pipe
at java.net.SocketOutputStream.socketWrite(Native Method)
at java.net.SocketOutputStream.write(SocketOutputStream.java:83)
at org.apache.ajp.Ajp13.send(Ajp13.java:525)
at org.apache.ajp.RequestHandler.finish(RequestHandler.java:496)
at org.apache.ajp.Ajp13.finish(Ajp13.java:395)
at
org.apache.ajp.tomcat4.Ajp13Response.finishResponse(Ajp13Response.java:192)
at
org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:435)
at
org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:495)
at java.lang.Thread.run(Thread.java:484)
I'm still not sure if this is not caused by a bug in the application running
but even if it is, mod_jk have to stop it's work and to signal JConnector
that the web browser is gone (if it is possible off course).
I believe if all we share more details about this error it will be fixed.
Regards,
Rossen
> -----Original Message-----
> From: Costas Stergiou [mailto:[EMAIL PROTECTED]]
> Sent: Friday, May 24, 2002 2:56 AM
> To: Tomcat Users List
> Subject: Re: Apcahe's CPU goes to 100%
>
>
> Many of use have posted this problem here but I see that nobody
> can come up with an answer...
>
> ----- Original Message -----
> From: "Cammy Ng" <[EMAIL PROTECTED]>
> To: "Tomcat Users List" <[EMAIL PROTECTED]>
> Sent: Thursday, May 23, 2002 9:39 AM
> Subject: Re: Apcahe's CPU goes to 100%
>
>
> > Hi,
> >
> > I have this problem too, but no one seems to answer this problem, I
> believe
> > it is the mod_jk connector problem. Hope someone will find
> the solution
> for
> > this.
> >
> > Thanks
> > Cammy
> > ----- Original Message -----
> > From: "Rajesh Mishra" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Wednesday, May 22, 2002 9:36 PM
> > Subject: Apcahe's CPU goes to 100%
> >
> >
> > > I'm using Apache1.3.12 and Tomcat3.2 for my
> application.After stress
> > testing
> > > for 4 hours , CPU utilization of Apache.exe process goes
> to 100%. As a
> > > result when I try to access the website , I'm getting
> timeouts. But I
> > could
> > > still access the website with tomcat port.
> > >
> > > Has anyone experienced this problem .I'm using mod_jk for
> this purpose
> > >
> > > Regards
> > > Rajesh
> > >
> > > --
> > > To unsubscribe, e-mail:
> > <mailto:[EMAIL PROTECTED]>
> > > For additional commands, e-mail:
> > <mailto:[EMAIL PROTECTED]>
> > >
> >
> >
> > --
> > To unsubscribe, e-mail:
> <mailto:[EMAIL PROTECTED]>
> > For additional commands, e-mail:
> <mailto:[EMAIL PROTECTED]>
> >
>
>
> --
> To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>
--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
