Hi,
Appreciate if you anyone accessed AJP Queue, your code snippet would
help me a great deal.
Thanks
Sri
srinivasch wrote:
>
> Hi Rainer,
>
> Thanks for your prompt response. I understand from your response that
> TOMCAT
> JMX doesnt provide me a way to access the AJP Queue. Does linux
> environment
> provide a way. Though your alternate suggestion is helpful I am trying to
> gather as much info I can.
>
> Thanks
> Sri
>
>
> On Thu, Mar 27, 2008 at 4:19 PM, Rainer Jung <[EMAIL PROTECTED]>
> wrote:
>
>> SriSri schrieb:
>> > Well I am trying to post this message from Nabble and its not getting
>> posted
>> > per their site message, I been trying to resend the message since 2
>> hours. I
>> > know the pain of spam and I dont intend to spam, was trying to post a
>> > genuine query. Thats all.
>> >
>> > Thanks for your help
>>
>> OK. At the moment Nabble seems to be quite behind. Marc seems to be
>> up-to-date:
>>
>> http://marc.info/?l=tomcat-user&r=1&b=200803&w=2
>>
>> Answer to your question: see below.
>>
>> > Sri
>> >
>> > On Thu, Mar 27, 2008 at 3:54 PM, Rainer Jung <[EMAIL PROTECTED]>
>> > wrote:
>> >
>> >> Please stop spaming the list. Sending the same question five times in
>> 90
>> >> minutes will most likely annoy everyone and reduce the chance to get
>> an
>> >> answer to an absolute minimum.
>> >>
>> >> Rainer
>> >>
>> >> SriSri schrieb:
>> >>> Hi,
>> >>>
>> >>> I am trying to find a way to access AJP Queue through JMX. If it
>> is
>> >>> possible with JMX or any other way let me know. I am using Tomcat
>> 5.5.20and
>> >>> I have clusters configured. I want to know whether the AJP Queue is
>> full
>> >> or
>> >>> not. Appreciate if anyone has any idea how to go about.
>>
>> Concerning your question: Tomcat doesn't have a request queue. It uses
>> two design elements:
>>
>> - a thread pool
>> - the usual connection backlog of the operating system
>>
>> The thread pool gets configured in the Connector element (server.xml).
>> It has an initial size, a maximum size and further parameters to define
>> growing and shrinking w.r.t varying load.
>>
>> The TCP connection backlog is operating systen specific and Tomcat only
>> configures its maximal length. Apart from that Tomcat is agnostic of the
>> backlog.
>>
>> Caution: I'm talking about the default connector. Other connectors
>> (tcnative also known as APR, or the NIO connector in TC 6) have a
>> different design.
>>
>> I guess what you want to know is, if your Tomcat is able to cope with
>> the load. If not, you will very quickly see the thread pool increasing
>> the number of threads until it reaches the configured maximum. So having
>> a look at the thread pool size is a good indicator. Each pool has an
>> MBean in JMX with name ThreadPool. There you can see the
>> currentThreadCount and the currentThreadsBusy.
>>
>> But: Ajp uses persistent connections. So an established connection can
>> be busy even if the thread handling it doesn't have to work on a request
>> and is simply waiting (possibly for a long time) for the next request.
>> From the point of view of the MBean, it will then be busy. From the
>> point of view of request load, it is idle :(
>>
>> To increase the precision of the observation, you can use the
>> connectionTimeout on the Connector, to allow Tomcat to close AJP
>> connections, that didn't send a new request for some time. Don't go to
>> extremes, because those will hurt performance. To check how far away
>> from thread pool exhaustion you are, it's not necessary to configure
>> extremely short connectionTimeouts. a Timeout between one and then
>> minutes is fine in most cases.
>>
>> The ultimate answer to "how many requests are we processing now" is
>> looking at a thread dump (kill -QUIT, goes to catalina.out).
>> Unfortunately you shouldn't really do that in monitoring.
>>
>> HTH
>>
>> Rainer
>>
>> >>> Thanks
>> >>> Sri
>>
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>>
>
>
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