Hi,
I am using mod_jk 1.2.19 on Linux with JDK 1.5.0_08, tomcat 5.5.20. Our
application is struts-based and in one of our actions we stream a PDF to
the client. The pseudo-code for outputting the response back to the client
is as follows (assuming baos contains a ByteArrayOutputStream):
OutputStream out = response.getOutputStream();
baos.writeTo(out);
out.flush();
out.close();
We noticed no problems when the size of baos was less than 400k. Now the
filesize has jumped to a little greater than 400k. With mod_jk in the
picture, intermittently (not all the time), we get ClientAbortException:
Caused by: ClientAbortException:
java.io.IOException at
org.apache.catalina.connector.OutputBuffer.realWriteBytes (
OutputBuffer.java:366)
The end result being that the PDF is truncated and Acrobat considers it
damaged.
Without mod_jk in the picture, everything is fine.
Turning up the mod_jk logging to debug gave me too much info. Turning it
down to info gave me some clues. Basically, there are 3 flavors of the
failures. Maybe they are all the same but it might appear different to a
trained eye, so I'm posting all three.
Flavor 1 error:
===============
[Mon Dec 04 14:28:59 2006] [25445:9920] [info]
ajp_connection_tcp_get_message::
jk_ajp_common.c (941): (local) Tomcat has forced a connection close for
socket 22
[Mon Dec 04 14:28:59 2006] [25445:9920] [error]
ajp_get_reply::jk_ajp_common.c (1562): (local) Tomcat is down or network
problems. Part of the response has already been sent to the client
[Mon Dec 04 14:28:59 2006] [25445:9920] [info]
ajp_service::jk_ajp_common.c (18 28): (local) receiving from tomcat failed,
recoverable operation attempt=0
[Mon Dec 04 14:28:59 2006] [25445:9920] [info]
ajp_service::jk_ajp_common.c (1867): (local) sending request to tomcat failed,
recoverable operation attempt=1
[Mon Dec 04 14:28:59 2006] [25445:9920] [info]
ajp_process_callback::jk_ajp_common.c (1410): Writing to client aborted or client
network problems
[Mon Dec 04 14:28:59 2006] [25445:9920] [info]
ajp_service::jk_ajp_common.c (1795): (local) request failed, because of client
write error without recovery in send loop attempt=1
[Mon Dec 04 14:28:59 2006] [25445:9920] [info]
jk_handler::mod_jk.c (2056): Aborting connection for worker=local
Flavor 2 error:
===============
[Mon Dec 04 14:30:30 2006] [25448:9920] [info]
ajp_send_request::jk_ajp_common.c (1170): (local) socket 22 is not connected
any more (errno=0)
[Mon Dec 04 14:30:30 2006] [25448:9920] [info]
ajp_send_request::jk_ajp_common.c (1194): (local) error sending request. Will
try another pooled connection
[Mon Dec 04 14:30:30 2006] [25448:9920] [info]
ajp_send_request::jk_ajp_common.c (1218): (local) all endpoints are disconnected
or dead
[Mon Dec 04 14:30:30 2006] [25448:9920] [info]
ajp_service::jk_ajp_common.c (1867): (local) sending request to tomcat failed,
recoverable operation attempt=1
[Mon Dec 04 14:30:32 2006] [25448:9920] [info]
ajp_connection_tcp_get_message::jk_ajp_common.c (941): (local) Tomcat has
forced a connection close for socket 22
[Mon Dec 04 14:30:32 2006] [25448:9920] [error]
ajp_get_reply::jk_ajp_common.c (1562): (local) Tomcat is down or network
problems. Part of the response has already been sent to the client
[Mon Dec 04 14:30:32 2006] [25448:9920] [info]
ajp_service::jk_ajp_common.c (1828): (local) receiving from tomcat failed,
recoverable operation attempt=1
[Mon Dec 04 14:30:32 2006] [25448:9920] [info]
ajp_service::jk_ajp_common.c (1867): (local) sending request to tomcat failed,
recoverable operation attempt=2
[Mon Dec 04 14:30:32 2006] [25448:9920] [error]
ajp_service::jk_ajp_common.c (1879): (local) Connecting to tomcat failed.
Tomcat is probably not started or is listening on the wrong port
[Mon Dec 04 14:30:32 2006] [25448:9920] [info]
jk_handler::mod_jk.c (2063): Service error=0 for worker=local
Flavor 3 error:
===============
[Mon Dec 04 14:32:31 2006] [25444:9920] [info]
ajp_send_request::jk_ajp_common.c (1170): (local) socket 22 is not
connected any more (errno=0)
[Mon Dec 04 14:32:31 2006] [25444:9920] [info]
ajp_send_request::jk_ajp_common.c (1194): (local) error sending
request. Will try another pooled connection
[Mon Dec 04 14:32:31 2006] [25444:9920] [info]
ajp_send_request::jk_ajp_common.c (1218): (local) all endpoints are
disconnected or dead
[Mon Dec 04 14:32:31 2006] [25444:9920] [info]
ajp_service::jk_ajp_common.c (1867): (local) sending request to tomcat
failed, recoverable operation attempt=1
Does anyone have any experience with streaming large files using mod_jk?
If I don't get any responses I will try the dev list.
Here's my mod_jk.conf:
LoadModule jk_module modules/mod_jk.so
JkWorkersFile conf/workers.properties
JkLogFile logs/mod_jk.log
JkLogLevel info
JkShmFile logs/mod_jk.shm
JkMount /jkstatus/ status
JkMount /sws/* local
Here's my workers.properties:
worker.list=local,status
worker.local.type=ajp13
worker.local.port=8009
worker.local.host=localhost
worker.status.type=status
worker.status.port=8009
worker.status.host=localhost
Anyone see any glaring mistakes or oddities? As I mentioned earlier, the
same setup worked fine. The only trigger that I can think of is the slight
increase in file size.
Any help appreciated.
thanks,
--
Haroon Rafique
<haroon.rafique@(protected)>
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