Add some tunable parameters for nova-scheduler
Since placement service was introduced, there have been several conditions where instances are not well distributed among multiple compute nodes. For example with the default configurations if a user creates multiple instances concurrently, these instances might be packed into a single compute node because placement returns the same results until any instance is actually launched at compute nodes. This change introdices two tunable parameters about nova-scheduler so that we can implement better distribution of nova instances in some usecases. Change-Id: Id488db4bd60b1c35704e24a0a85d61853bfd7038
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@ -118,6 +118,16 @@ parameters:
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aggregates to be reported in placement, so only hosts within the asked
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aggregates would be accepted.
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type: boolean
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NovaSchedulerHostSubsetSize:
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default: 1
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description: >
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Size of subset of best hosts selected by scheduler.
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type: number
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NovaSchedulerShuffleBestSameWeighedHosts:
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default: false
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description: >
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Enable spreading the instances between hosts with the same best weight.
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type: boolean
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# DEPRECATED: the following options are deprecated and are currently maintained
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# for backwards compatibility. They will be removed in future release.
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NovaSchedulerDefaultFilters:
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@ -206,6 +216,8 @@ outputs:
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- {get_param: NovaSchedulerDefaultFilters}
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- {get_param: NovaSchedulerEnabledFilters}
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nova::scheduler::filter::scheduler_max_attempts: {get_param: NovaSchedulerMaxAttempts}
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nova::scheduler::filter::scheduler_host_subset_size: {get_param: NovaSchedulerHostSubsetSize}
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nova::scheduler::filter::shuffle_best_same_weighed_hosts: {get_param: NovaSchedulerShuffleBestSameWeighedHosts}
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nova::scheduler::discover_hosts_in_cells_interval: {get_param: NovaSchedulerDiscoverHostsInCellsInterval}
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nova::scheduler::query_placement_for_image_type_support: {get_param: NovaSchedulerQueryImageType}
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nova::scheduler::limit_tenants_to_placement_aggregate: {get_param: NovaSchedulerLimitTenantsToPlacementAggregate}
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@ -0,0 +1,8 @@
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---
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features:
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- |
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Add the following parameters to tune the behavior of nova-scheduler to
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achieve better distribution of instances.
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- ``NovaSchedulerHostSubsetSize``
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- ``NovaSchedulerShuffleBestSameWeighedHosts``
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