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Heat Autoscaling: Adaptation actions on existing servers


I would like to instantiate a Hadoop cluster with Heat and autoscaling. I was wondering if there is a way to trigger adaptation actions on existing servers (i.e. the master node) to add new nodes to the conf/slaves file or remove them in the case of downscaling. More generally speaking, I'm looking for a way to have existing servers to be notified in case of alarm events to execute commands in response to them. I haven't found anything related to this in the documentation, but surely there must be some sort of support for that?