[openstack-dev] [OpenStack][Heat] AutoScaling scale down issue

Liang Chen cbjchen at linux.vnet.ibm.com
Thu Dec 12 12:10:55 UTC 2013

On 12/11/2013 11:43 PM, Jay Lau wrote:
> Greetings,
> Here come a question related to heat auto scale down.
> The scenario is as following:
> I was trying to deploy hadoop cluster with heat Auto Scaling template.
> When scale up a slave node, I can use user-data to do some post work 
> for configuration file on hadoop master node base on the information 
> of slave node (The mainly configuration file is conf/slaves as I need 
> to put slave node to this file);
> But when scale down, seems I have no chance to do some configuration 
> for the master node (Remove the scale down node from conf/slaves) as 
> master node do not know which slave node was scale down.
Yes. There isn't a way to add a hook to do any sort of "post work" after 
an instance is brought down. That is why AutoScalingGroup and 
LoadBalancer resource usually come in pair, even though 
LoadBalancerNames isn't a mandatory property. Internally 
AutoScalingGroup triggers a load balancer reload each time it's resized, 
but that doesn't happen to any other resources (like a customized 
instance in your case). This might be something we can improve in the 
> Does anyone has some experience on this?
> Thanks,
> Jay
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