nova/releasenotes/notes/no-placement-fallback-5db2d...

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---
upgrade:
- In Ocata, the nova-scheduler would fall back to not calling the
placement service during instance boot if old computes were
running. That compatibility mode is no longer present in Pike, and
as such, the scheduler fully depends on the placement service.
This effectively means that in Pike Nova requires Placement API
version 1.4 (Ocata).