Hi,
Occassionally (but often enough to trigger our monitoring tools) a tomcat
page is generated way too slow, it takes then appr. 300 sec.
When I look at the logging I observe the following:
Tomcat access log: reports that the response is generated in a couple of
milliseconds.
mod_jk log: reports that the response is generated is just over 300 seconds
Apache: reports that the response take anything between 300 seconds and 600
seconds
The response is big enough to divide it into several AJP13 response chunks.
The response has neither a Content-Length header or a Transfer-Encoding
header. When accessing Tomcat through the HTTP connector, chunked encoding
is used.
My remarks on this:
I get the feeling that the AJP13_END_RESPONSE is not sent immediately by the
tomcat jk-connector, but something times out after 300 seconds on the tomcat
side, thereby forcing a flush on the connection. Because of the 300 seconds
timeout I think it has something todo with the Keep-Alive header
The browser sends a "Keep-Alive: 300" header, this header is send to tomcat.
Tomcat somehow honours this header and closes the connection after 300
seconds.
Solutions?:
- will adding 'JkOptions +FlushPackets' to the apache config help?
- can I somehow disable sending the Keep-Alive header to tomcat and will
that help?
Any ideas/remarks?
regards Henk Fictorie
------------------------------------------
Configuration info:
Apache 2.0.59
JkLogLevel info
JkWorkersFile /usr/local/apache2/conf/workers.properties.1.2.19
JkLogFile "|/usr/local/apache2/bin/cronolog
/bar/logs/apache2/%Y/%m/%d/mod_jk.80.log"
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkShmFile /usr/local/apache2/logs/jk-runtime-status
JkMount /foo/* lbworker
JkRequestLogFormat "%R %r %s %T"
mod_jk 1.2.19
# worker template
worker.template.type=ajp13
worker.template.port=1832
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
Tomcat 5.0.28
<Connector className="org.apache.coyote.tomcat5.CoyoteConnector"
port="1832" minProcessors="5" maxProcessors="500"
acceptCount="10" debug="0" enableLookups="true"
redirectPort="8443"
connectionTimeout="0" useURIValidationHack="false"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler" />
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