Hi,
Do you have a firewall between apache and Tomcat? Looks like the connection
gets closed before Tomcat is able to send the response.
Try JkOptions DisableReuse, this worked for me.
Gabriel
"Ângelo Vimeney"
<avimeney@xxxxxxx
om> To
users@xxxxxxxxxxxxxxxx
06/12/2007 01:27 cc
PM
Subject
Apache, Tomcat and
Please respond to mod_proxy
users@xxxxxxxxxxx
e.org
Hello everybody,
I'm experiencing problems using the Apache server as a proxy to my
Tomcat server and I will appreciate if somebody could help me. Please,
take my apologies for my poor English and long mail.
I'm using Apache version 2.2.6 installed on a dedicated HTTP server
machine (running Linux 2.6.9-34.EL). I'm using Tomcat version 6.0.14
installed on another dedicated server machine (running Linux
2.6.9-34.EL). I have also a remote browser emulator running on another
dedicated machine. The emulated browsers access an e-commerce site
deployed at the Tomcat server (I'm running the TPC-W benchmark).
When I simulate 25 browsers accessing Apache, everything works fine.
But when I increase this value to 50, after 5 minutes of simulation,
the following error message is logged at the Apache's error_log file:
[Tue Dec 04 16:47:17 2007] [notice] Apache/2.2.6 (Unix) configured --
resuming normal operations
[Tue Dec 04 16:53:08 2007] [error] (70007)The timeout specified has
expired: ajp_ilink_receive() can't receive header
[Tue Dec 04 16:53:08 2007] [error] ajp_read_header: ajp_ilink_receive
failed
[Tue Dec 04 16:53:08 2007] [error] (120006)APR does not understand
this error code: proxy: read response failed from 10.10.20.246:8009
(compute-0-0)
[Tue Dec 04 16:53:08 2007] [error] (70007)The timeout specified has
expired: ajp_ilink_receive() can't receive header
[Tue Dec 04 16:53:08 2007] [error] ajp_read_header: ajp_ilink_receive
failed
[Tue Dec 04 16:53:08 2007] [error] (120006)APR does not understand
this error code: proxy: read response failed from 10.10.20.246:8009
(compute-0-0)
...
At the Tomcat's catalina.out I found the following log:
...
Dec 4, 2007 4:47:49 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 3549 ms
Dec 4, 2007 4:53:51 PM org.apache.jk.core.MsgContext action
WARNING: Error sending end packet
java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at org.apache.jk.common.ChannelSocket.send(ChannelSocket.java:531)
at
org.apache.jk.common.JkInputStream.endMessage(JkInputStream.java:121)
at org.apache.jk.core.MsgContext.action(MsgContext.java:301)
at org.apache.coyote.Response.action(Response.java:183)
at org.apache.coyote.Response.finish(Response.java:305)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:195)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:595)
Dec 4, 2007 4:53:51 PM org.apache.jk.common.ChannelSocket processConnection
WARNING: processCallbacks status 2
Dec 4, 2007 4:53:56 PM org.apache.jk.core.MsgContext action
WARNING: Error sending end packet
java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at org.apache.jk.common.ChannelSocket.send(ChannelSocket.java:531)
at
org.apache.jk.common.JkInputStream.endMessage(JkInputStream.java:121)
at org.apache.jk.core.MsgContext.action(MsgContext.java:301)
at org.apache.coyote.Response.action(Response.java:183)
at org.apache.coyote.Response.finish(Response.java:305)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:195)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:595)
...
I have successfully build my Apache using:
configure --enable-modules='proxy proxy_ajp proxy_balancer'
make
make install
I added to the original httpd.conf the followings configurations:
ProxyRequests Off
<Location /tpcw>
ProxyPass balancer://tomcatCluster/tpcw stickysession=JSESSIONID
nofailover=On timeout=60
ProxyPassReverse balancer://tomcatCluster/tpcw
</Location>
<Proxy balancer://tomcatCluster>
BalancerMember ajp://compute-0-0:8009 route=tomcat1
</Proxy>
ServerLimit 75
MaxClients 75
In the Tomcat's server.xml, I'm using:
<Connector port="8009" enableLookups="false" redirectPort="8443"
protocol="AJP/1.3" maxThreads="75"
minSpareThreads="50"
maxSpareThreads="50"/>
<Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat1">
After the error, both Apache and Tomcat still working fine, but the
error makes my simulation's results unreliable. Note that, when I use
the mod_jk instead of mod_proxy, no problems arise, not even with more
than 50 emulated browsers. Is that some configuration problem?? Any
suggestions?
Thanks in advance,
Ângelo Vimeney
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