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From Stephen Booth <>
Subject Re: Making fail-over work with PermGen errors
Date Thu, 05 Nov 2015 15:26:10 GMT

On 04/11/2015 19:59, Christopher Schultz wrote:
> Memory-related errors are always problematic.
> Do you have any instrumentation/monitoring to check the liveness of your
> Tomcat nodes? Can it detect the OOME condition? If so, you should be
> able to notify the load-balancer that something had gone wrong. I'm
> unsure of how to do it with mod_proxy_ajp, but mod_jk can be
> re-configured externally e.g. by calling curl with a specially-crafted
> URL[1].

Yes I think thats the route we are going to go down. Actually
re-analysing the problem I think the load balancer might have
successfully failed over but because the dead node was not noticed it
hung around in a blocked state until the node was needed.


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