Updated scheduler and compute for multiple capabilities.

Part 1 of 6: blueprint general-bare-metal-provisioning-framework.

This patch includes updates on scheduler and compute codes for
multiple capabilities. This feature is needed in bare-metal
provisioning which is implemented in later patches --- a bare-metal
nova-compute manages multiple bare-metal nodes where instances are
provisioned. Nova DB's compute_nodes entry needs to be created for
each bare-metal node, and a scheduler can choose an appropriate
bare-metal node to provision an instance.

With this patch, one service entry with multiple compute_node entries
can be registered by nova-compute. Distinct 'node name' is given for
each node and is stored at compute_node['hypervisor_hostname'].
And we added a new column "node" to "instances" table in Nova DB to
associate instances with compute_node. FilterScheduler puts <nodename>
to the column when it provisions the instance. And nova-computes
respect <nodename> when run/stop instances and when calculate
resources.

Also, 'capability’ is extended from a dictionary to a list of
dictionaries to describe the multiple capabilities of the multiple
nodes.

Change-Id: I527febe4dbd887b2e6596ce7226c1ae3386e2ae6
Co-authored-by: Mikyung Kang <mkkang@isi.edu>
Co-authored-by: David Kang <dkang@isi.edu>
Co-authored-by: Ken Igarashi <igarashik@nttdocomo.co.jp>
Co-authored-by: Arata Notsu <notsu@virtualtech.jp>

1 files changed, 9 insertions, 0 deletions

diff --git a/nova/scheduler/driver.py b/nova/scheduler/driver.py
index f93268906..e9cbd509b 100644
--- a/nova/scheduler/driver.py
+++ b/nova/scheduler/driver.py
@@ -99,6 +99,15 @@ def instance_update_db(context, instance_uuid):
     return db.instance_update(context, instance_uuid, values)
 
 
+def db_instance_node_set(context, instance_uuid, node):
+    '''Set the node field of an Instance.
+
+    :returns: An Instance with the updated fields set properly.
+    '''
+    values = {'node': node}
+    return db.instance_update(context, instance_uuid, values)
+
+
 def cast_to_compute_host(context, host, method, **kwargs):
     """Cast request to a compute host queue"""