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Date: Sat, 05 Jul 2008 00:09:38 +0200
From: Rainer Jung <rainer.jung@kippdata.de>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: mod_ajp and Load-Balancing Issue
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Plana, Richard schrieb:
>  
> 
>> -----Original Message-----
>> From: Rainer Jung [mailto:rainer.jung@kippdata.de] 
>> Sent: Friday, July 04, 2008 12:38 PM
>> To: Tomcat Users List
>> Subject: Re: mod_ajp and Load-Balancing Issue
>>
>> Plana, Richard schrieb:
>>> Hi,
>>>
>>> Thanks. Yes, if I can't share the session information between the 
>>> various instances of Tomcat, I'd rather make a session sticky to a 
>>> node in the load-balance pool.
>>>
>>> So I tried giving a jvmRoute to each Tomcat instance. I'm a little 
>>> confused with the mod_proxy_balancer configuration, though. 
>> What I've 
>>> done so far is the following:
>>>
>>> <Proxy balancer://mycluster>
>>>         BalancerMember ajp://appserver1:8009/myapp max=10 smax=6 
>>> ttl=30 ping=120 route=jvm1
>>>         BalancerMember ajp://appserver2:8009/myapp max=10 smax=6 
>>> ttl=30 ping=120 route=jvm2 </Proxy> ProxyPass /myapp 
>>> balancer://mycluster/ ProxyTimeout 60
>>>
>>> From the browser client side, I can see the ".jvm[12]" 
>> being appended 
>>> to the JSESSIONID cookie, but it would still switch from 
>> one Tomcat to 
>>> the other, albeit less frequently.
>>>
>>> What am I doing wrong?
>> So far, so good. You also need to tell mod_proxy_balancer, 
>> what the name of the URL parameter resp. Cookie is, which 
>> carries the routing information. I forgot about that (in 
>> mod_jk it is automatically the right for Java App Servers, 
>> mod_proxy is more flexible and you need to set it).
>>
>> So add "stickysession=JSESSIONID|jsessionid" at the end of 
>> the ProxyPass line. See also the mod_proxy docs page, look 
>> out for stcikysession.
> 
> Tried that after you mentioned it, but no, httpd still shifts my access
> from one node to the other (and I lose my session info). I even tried
> the plain example on the docs page (no jvmRoute info). Still no go.
> 
> Suggestions? Ideas?

Is that related to the error message you posted in the parallel 
discussion thread, i.e. are the two things happening at the same time? 
If so I would say a worker went into error state because of this (and it 
keeps that state for some time) and all requests have been rerouted to 
the other worker.

Regards,

Rainer

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