scheduler: add host az caching to AvailabilityZoneFilter
Registered by
moorryan
The mapping between the host and az is usually static, to reduce db calls cache it in memory for future lookups.
Set cache time (default 1hr) to have some randomisation, so that only the first request needs to update all nodes at the same time.
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Add caching of host-az mapping
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Propose add caching of host az-mapping
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