OpenStack Orchestration (Heat)
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heat/doc/source/schedulerhints.rst

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Heat Stack Lifecycle Scheduler Hints

This is a mechanism whereby when heat processes a stack Server resource, the stack id, root stack id, stack resource id, stack resource name and the path in the stack can be passed to nova by heat as scheduler hints, to the configured schedulers for nova.

Enabling the scheduler hints

By default, passing the lifecycle scheduler hints is disabled. To enable it, set stack_scheduler_hints to True in heat.conf.

The hints

When heat processes a stack, and the feature is enabled, the stack id, root stack id, stack resource id, stack resource name and the path in the stack (as a list of tuple, (stackresourcename, stackname)) will be passed to nova by heat as scheduler hints, to the configured schedulers for nova.

Purpose

A heat provider may have a need for custom code to examine stack requests prior to performing the operations to create or update a stack. After the custom code completes, the provider may want to provide hints to the nova scheduler with stack related identifiers, for processing by any custom scheduler plug-ins configured for nova.