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2007-09-06 - By Henk Fictorie

Back

Hi,

We are using mod_jk 1.2.21 on Solaris 8. together Apache 2.0.59 with the
worker MPM.
We are moving our applicationserver to a new version which is also using a
new Tomcat version. We now have a split application which is using both
Tomcat 5.0 and the other part is using Tomcat 5.5. For tomcat 5.5 we set the
connectionTimeout to 10 minutes, for 5.0 it is set to 0 (infinite)

For Tomcat 5.0 we see lots more ESTABLISHED connections than for Tomcat 5.5.
While I expected it to be the same.
For the Tomcat 5.0 connections we do not see any errors (except for client
errors).
For the Tomcat 5.5 connections we see errors occuring, claiming that it
cannot connect to Tomcat:

[Thu Sep 06 09:17:15 2007] [2735:0061] [info]
ajp_send_request::jk_ajp_common.c (1215): dummy) error sending request. Will
try another pooled connection
[Thu Sep 06 09:17:15 2007] [2735:0061] [info]
ajp_send_request::jk_ajp_common.c (1241): (dummy) all endpoints are
disconnected
[Thu Sep 06 09:17:15 2007] [2735:0061] [info]
ajp_send_request::jk_ajp_common.c (1244): (dummy) increase the backend idle
connection timeout or the connection_pool_minsize
[Thu Sep 06 09:17:15 2007] [2735:0061] [info] ajp_service::jk_ajp_common.c
(1930): (dummy) sending request to tomcat failed, recoverable operation
attempt=1
[Thu Sep 06 09:17:15 2007] [2735:0061] [error] ajp_service::jk_ajp_common.c
(1942): (dummy) Connecting to tomcat failed. Tomcat is probably not started
or is listening on the wrong port
[Thu Sep 06 09:17:15 2007] [2735:0061] [info] service::jk_lb_worker.c
(1023): service failed, worker dummy is in error state

On the mod_jk side of things we use the same settings for both applications:

worker.maintain=60

# worker template
worker.template.type=ajp13
worker.template.port=xxxx
worker.template.lbfactor=50
worker.template.connection_pool_timeout=600
worker.template.socket_timeout=62
worker.template.connect_timeout=30000
worker.template.prepost_timeout=30000
worker.template.recovery_options=0
worker.template.reply_timeout=600000
worker.template.retries=1

On the tomcat 5.0 side the connectionTimeout is set to 0 (infinite)

<Connector className="org.apache.coyote.tomcat5.CoyoteConnector"
port="xxxx" minProcessors="5" maxProcessors="500"
acceptCount="10" debug="0" enableLookups="true"
redirectPort="8443"
connectionTimeout="0" useURIValidationHack="false"

protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler" />

On the tomcat 5.5 site the connectionTimeout is set to 10 minutes:

<Connector port="xxxx" address="a.b.c.d" enableLookups="false"
emptySessionPath="true"
minSpareThreads="20" maxThreads="750" acceptCount="10"
connectionTimeout="600000"
redirectPort="8443" debug="0" protocol="AJP/1.3" />

So, on the timeout settings for Tomcat 5.5 I am using the recommended values
described in the 'timeouts howto' section.
The info messages suggest that I should increase the connectionTimeout on
the Tomcat side. Probably to some value > (connection_pool_timeout +
worker.maintain)??
Or should I set the connection_pool_minsize to match the minSpareThreads??
Or upgrade to mod_jk 1.2.25??

Advice is welcome.

regards Henk Fictorie

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