nova/releasenotes/notes/placement-claims-844540aa7b...

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The filter scheduler will now attempt to claim a number of
resources in the placement API after determining a list of
potential hosts. We attempt to claim these resources for each instance
in the build request, and if a claim does not succeed, we try this
claim against the next potential host the scheduler selected. This
claim retry process can potentially attempt claims against a large
number of hosts, and we do not limit the number of hosts to attempt
claims against. Claims for resources may fail due to another scheduler
process concurrently claiming resources against the same compute node.
This concurrent resource claim is normal and the retry of a claim
request should be unusual but harmless.