Scheduler

The manila.scheduler.manager Module

Scheduler Service

class SchedulerManager(scheduler_driver=None, service_name=None, *args, **kwargs)

Bases: manila.manager.Manager

Chooses a host to create shares.

RPC_API_VERSION = '1.4'

create_consistency_group(context, cg_id, request_spec=None, filter_properties=None)

create_share_instance(context, request_spec=None, filter_properties=None)

get_host_list(context)

Get a list of hosts from the HostManager.

get_pools(context, filters=None)

Get active pools from the scheduler’s cache.

get_service_capabilities(context)

Get the normalized set of capabilities for this zone.

init_host()

migrate_share_to_host(context, share_id, host, force_host_copy, request_spec, filter_properties=None)

Ensure that the host exists and can accept the share.

request_service_capabilities(context)

update_service_capabilities(context, service_name=None, host=None, capabilities=None, **kwargs)

Process a capability update from a service node.

The manila.scheduler.driver Module

Scheduler base class that all Schedulers should inherit from

class Scheduler

Bases: object

The base class that all Scheduler classes should inherit from.

get_host_list()

Get a list of hosts from the HostManager.

get_pools(context, filters)

Must override schedule method for scheduler to work.

get_service_capabilities()

Get the normalized set of capabilities for the services.

host_passes_filters(context, host, request_spec, filter_properties)

Must override schedule method for migration to work.

hosts_up(context, topic)

Return the list of hosts that have a running service for topic.

schedule(context, topic, method, *_args, **_kwargs)

Must override schedule method for scheduler to work.

schedule_create_consistency_group(context, group_id, request_spec, filter_properties)

Must override schedule method for scheduler to work.

schedule_create_share(context, request_spec, filter_properties)

Must override schedule method for scheduler to work.

update_service_capabilities(service_name, host, capabilities)

Process a capability update from a service node.

cg_update_db(context, cg_id, host)

Set the host and set the updated_at field of a consistency group.

Returns:A CG with the updated fields set properly.

share_update_db(context, share_id, host)

Set the host and set the scheduled_at field of a share.

Returns:A Share with the updated fields set properly.

The manila.scheduler.simple Driver

Simple Scheduler

class SimpleScheduler

Bases: manila.scheduler.chance.ChanceScheduler

Implements Naive Scheduler that tries to find least loaded host.

schedule_create_share(context, request_spec, filter_properties)

Picks a host that is up and has the fewest shares.

Tests

The scheduler Module