Cloned from launchpad blueprint https://blueprints.launchpad.net/heat/+spec/decouple-nested.
Decouple nested stacks from their parent by creating them via RPC requests, which will allow more effective distribution of the workload involved with managing large hierarchies of stacks by enabling each to be potentially processed by a different heat-engine process.
spec review: https://review.openstack.org/#/c/113296
Specification URL (additional information):
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