John Garbutt 1b24bfbd73 Add a caching scheduler driver ... This adds a new scheduler driver, CachingScheduler It currently subclasses the filter scheduler and only adds caching of calls to host_manager.get_all_host_states. It relies on there being a small number of schedulers, ideally one, calls to consume_from_instance within the filter scheduler to update the current cached list of hosts, and a low rate of deletes. It introduces the new config value: scheduler_driver_task_period The periodic task it controls is used by the caching scheduler to fetch an updated copy of host_manager.get_all_host_states. If your value for service_down_time is much smaller than scheduler_driver_task_period, there will be issues with hosts appearing to be dead, just because the list of hosts is being cached. Correct configuration of those two values can avoid this issue. DocImpact Part of blueprint caching-scheduler Change-Id: I2eb873ce8024a576e597205e2d52b5d5e8aee97a		2014-02-26 13:53:07 +00:00
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xen	Remove vi modelines	2014-02-03 14:19:44 +00:00
profile_caching_scheduler.sh	Add a caching scheduler driver	2014-02-26 13:53:07 +00:00