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Date: Thu, 26 Jul 2007 14:54:13 -0400
From: Andrew Lee Rubinger <alr@9mmedia.com>
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Subject: Tomcat/AJP Client Abort Socket Errors - Leads to File Descriptor
 Leak
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Hi.

I am running Apache HTTPD 2.2.4 with ModJK 1.2.21, both compiled from 
source on CentOS 4.4.  I have a workers.properties file configured to 
send requests to Tomcat 5.5 on a separate machine within the internal 
network.

When receiving a ClientAbortException from Tomcat (shown in 
"tomcat_broken_pipe_error.txt"), it seems that the socket connection 
between ModJK and Tomcat is not closed out, and on the Application 
Server running Tomcat I'm observing a Life Descriptor leak (as shown in 
"lsof.txt").

I've tried setting "recovery_options" to 4 as suggested by 
http://tomcat.apache.org/connectors-doc/reference/workers.html, but this 
has not corrected the problem.

Have attached all relevant log excerpts and configurations in hopes that 
someone has come across this and might have some insight.

Thanks in advance for your help.  Will be happy to provide any other 
information I may have excluded.

S,
ALR

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[Thu Jul 26 10:40:30 2007] [9723:33888] [info]  ajp_process_callback::jk_ajp_common.c (1447): Writing to client aborted or client network problems
[Thu Jul 26 10:40:30 2007] [9723:33888] [info]  ajp_service::jk_ajp_common.c (1846): (worker1) request failed, because of client write error without recovery in send loop attempt=0
[Thu Jul 26 10:40:30 2007] [9723:33888] [info]  jk_handler::mod_jk.c (2190): Aborting connection for worker=worker1

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shell> lsof | grep java |grep protocol |cat -n

   1  java      29220   root  268u     sock                0,4             1320191 can't identify protocol

...

   206  java      29220   root  268u     sock                0,4             1320191 can't identify protocol
   207  java      29220   root  271u     sock                0,4             1311912 can't identify protocol
   208  java      29220   root  272u     sock                0,4             1314866 can't identify protocol
   209  java      29220   root  274u     sock                0,4             1318451 can't identify protocol
   210  java      29220   root  275u     sock                0,4             1316105 can't identify protocol
   211  java      29220   root  282u     sock                0,4             1317445 can't identify protocol
   212  java      29220   root  283u     sock                0,4             1320665 can't identify protocol
   213  java      29220   root  286u     sock                0,4             1320672 can't identify protocol
   214  java      29220   root  357u     sock                0,4             1312810 can't identify protocol

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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:112)
     at org.apache.jk.core.MsgContext.action(MsgContext.java:293)
     at org.apache.coyote.Response.action(Response.java:182)
     at org.apache.coyote.Response.finish(Response.java:304)
     at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:204)
     at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
     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:684)
     at java.lang.Thread.run(Thread.java:595)

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# Create 1 Worker
worker.list=worker1
  
# Worker 1 Properties
worker.worker1.type=ajp13
worker.worker1.host=192.168.10.10
worker.worker1.port=8009
worker.worker1.recovery_options=4


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