Hallo,
I studied the mod_jk docs and the following questions about mod_jk Options are
haunting me - i hope wrote the questions in an understandable form and i am
pleased of getting hints and tips.
.) retries (for LB workers)
-> At the Apache we use he prefork MPM. So how big is the connection_pool ?
because a retry of a lb-worker happens if the loadbalancer can not get a free
connection for a member worker from the pool (Info from the doku).
Does it depends on the Apache prefork Parameters MaxClients and
MaxRequestsPerChild ?
If it is so - we have MaxClients 500 and MaxRequestsPerChild 10000 => this
means the webserver can send/handle 5000000 requests ?
-> is this the size of our connection_pool? - i don't think so.
On the other side we have 36 Tomcat instances - each Tomcat has -
maxThreads=300 on the AJP connector. => ?this doesn't fit, or?
(And 3 Apache as frontend - all configured the same)
In the worker model i think the number of threads must correspond to the max
threads of the Tomcat - but how does it work in our prefork model?
.) Why does a load-balancer retries to get a free connection for a member
worker from the pool ? Why doesn't he use another member worker ?
.) reply_timeout - does it only work between the request and the first response
packet or between each two response packets. Is a response packet an AJP-packet
with 8k default size ?
.) what is the socket_timeout good for ?
We configured a connection_timeout, a prepost_timeout and a reply_timeout => i
can't find a situation where i need an additional socket_timeout ?
And when i wants to know what happens in my system - i think i need a more
"higher level" failure message to evaluate the situation - but on socket level ?
.) this question concerns to the mod_jk options "retries" (for "normal" worker)
(hint - better to find an other Name - the same name for two different things
makes problems when writing about) in association with the recovery_options.
=> when i use the value 7 for the recovery_option - Bit 1+2+4 => i think a
retry is only possible if the connection timeout matches.
- not on the prepost_timout and not in the situation of reply_timeout => is
this right ?
Another question to the same topic: i have a long running sticky session - this
means that in this session are many requests against the same Tomcat.
Will there be established a new connection for each request ? or will there be
used the established connection for all requests?
If second - that means the established connection is used for all requests of
the session => than a retry will not happen if during
the session the Tomcat causes Problems. (with recovery_options 7). - is this
right?
Version mod_jk 1.2.26 (upgraded recently)
Here my worker.properties
worker.properties
worker.list=ajp_bam,ajp_ggi,ajp_ad,ajp_svp,.......,jkstatus
worker.template.type=ajp13
worker.template.lbfactor=5
worker.template.socket_keepalive=1
worker.template.connect_timeout=7000
worker.template.prepost_timeout=5000
worker.template.reply_timeout=180000
worker.template.retries=20
worker.template.activation=Active
worker.template.recovery_options=7
worker.lbtemplate.type=lb
worker.lbtemplate.max_reply_timeouts=6
worker.lbtemplate.method=Session
#Produktions Worker
# AS-INETP101 - 106 - 6/6 GGI
worker.INETP1011.host=AS-INETP101.AEAT.ALLIANZ.AT
worker.INETP1011.port=65001
worker.INETP1011.reference=worker.template
....many more of the same
then
worker.ajp_ad.reference=worker.lbtemplate
worker.ajp_ad.balance_workers=INETP1032,INETP1062
.... many more portals
at least jkstatus
The JKMount is very simple
JkMount /* ajp_ad --- for the other portals mostly the same
The Portals are Virtual Hosts on the Apache.
Tomcat - server.xml
example
<Connector port="65001" maxThreads="300" protocol="AJP/1.3" />
<Engine name="Catalina" jvmRoute="INETP5021"
defaultHost="default">
......
<Host name="slfinsol.com" appBase="webapps" unpackWARs="true"
autoDeploy="false" deployOnStartup="false" xmlValidation="false"
xmlNamespaceAware="false">
<Alias>www.slfinsol.com</Alias>
<Alias>web1.slfinsol.com</Alias>
...
<Alias>testweb.slfinsol.com</Alias>
.....
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs" prefix="swl_access_log." suffix=".txt"
pattern="common" resolveHosts="false" />
<Valve className="at.allianz.tomcat.valve.RequestTimeValve"/>
<Valve
className="at.allianz.tomcat.valve.WebcollaborationWorkaroundValve"/>
<Context path="" docBase="swl" />
<Context path="/monitor5" docBase="monitor" />
<Context path="/swl" docBase="swl" />
</Host>
thanxs for your time reading this and maybe giving tipps -
with kind regards
ahmed musa
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