Module policy
source code
Haizea uses a policy manager that allows certain scheduling decisions
to be delegated to pluggable policies. This is done so scheduling
policies can be (1) modified without having to modify core components of
Haizea, and (2) implemented by writing a single Python class that
implements a given interface for pluggable policies.
Three policies are currently pluggable: lease preemptability
("Can lease X preempt lease Y?"), host selection ("I want
to deploy a VM, what host should I select for this?") and lease
admission ("Should I accept/reject this lease request?").
Haizea provides several simple policy modules in the haizea.policies
package. The policy to use is selected in the configuration file. See the
Haizea Documentation for more details on how this is done.
This module provides Haizea's policy manager and the base classes for
pluggable policies.
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__package__ = ' haizea.core.scheduler '
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