Hi chuck,
We have not set the "keep alive" explicitly in tomcat's server.xml. Howeverm
when I print the thread id for all requests from same browser, it prints the
same thread it. It gives me a feeling that all HTTP requests are holding worker
thread of tomcat if they originate from same browser.
My tomcat configuration is as follows:
<Server port="${tomcat.internalserver.port}" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.JasperListener" />
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Service name="Catalina" >
<Executor name="hybrisExecutor"
namePrefix="hybrisHTTP"
maxThreads="${tomcat.maxthreads}"
minSpareThreads="${tomcat.minsparethreads}"
maxIdleTime="${tomcat.maxidletime}"/>
<Connector port="${tomcat.ajp.port}"
maxHttpHeaderSize="8192"
maxThreads="200"
protocol="org.apache.coyote.ajp.AjpProtocol"
executor="hybrisExecutor"
enableLookups="false"
acceptCount="100"
connectionTimeout="20000"
URIEncoding="UTF-8"
disableUploadTimeout="true" />
<Connector port="${tomcat.http.port}"
maxHttpHeaderSize="8192"
maxThreads="${tomcat.maxthreads}"
protocol="org.apache.coyote.http11.Http11Protocol"
executor="hybrisExecutor"
enableLookups="false"
acceptCount="100"
connectionTimeout="20000"
URIEncoding="UTF-8"
disableUploadTimeout="true" />
<Engine name="Catalina" defaultHost="localhost"
jvmRoute="${tomcat.ajp.worker}">
<Valve
className="org.apache.catalina.valves.FastCommonAccessLogValve"
directory="${HYBRIS_LOG_DIR}/tomcat"
prefix="access."
suffix=".log"
pattern="%{X-Forwarded-For}i %l %u %t %T %r %s
%b %{User-Agent}i %{Referer}i %{JSESSIONID}c"
/>
<Host name="localhost"
appBase="webapps"
unpackWARs="true"
autoDeploy="false"
xmlValidation="false"
xmlNamespaceAware="false">
${tomcat.webapps.60}
</Host>
</Engine>
</Service>
</Server>
Regards,
Saurabh Agrawal
Manager Technology | Sapient
-----Original Message-----
From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com]
Sent: Wednesday, March 20, 2013 1:37 AM
To: Tomcat Users List
Subject: RE: Tomcat Behavior on Multiple HTTP requests from same browser
> From: Saurabh Agrawal [mailto:sagra...@sapient.com]
> Subject: Tomcat Behavior on Multiple HTTP requests from same browser
> Let's say I hit http://localhost:9001/homepage.html. Upon hitting the URL,
> tomcat will assign one of the worker threads (say Thread 1) from the pool
> to the HTTP request which will be processed and then response will be sent
> to the client. Now if I hit a link on homepage which is for login, a separate
> HTTP request will be initiated from the same browser.
> What I want to understand is if the Tomcat will keep Thread 1 as persistent
> thread to server the second request (for login) from the same browser or will
> it assign a separate thread from the pool ?
Normally, the first available thread from the pool is used for each request.
However, if you are using the BIO <Connector> with keep-alives enable *and* the
browser is using keep-alives, the same thread as long as the HTTP connection is
active.
See the HTTP <Connector> doc, especially the Connector Comparison at the end.
http://tomcat.apache.org/tomcat-7.0-doc/config/http.html
- Chuck
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