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Added fixes and readme for the feature
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Roman Dobosz
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affinity_ocata/README.rst
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228
affinity_ocata/README.rst
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Aggregate affinity
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==================
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This series of patches add ability for creating aggregation of ironic nodes in
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Nova. This work is based on work of `Jay Pipes series`_ back ported to Ocata,
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with some additional fixes.
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After applying those patches on Ocata tree nova and novaclient, it will be
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possible to create aggregates which contain ironic nodes and a group with one
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of two new policies:
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* aggregate-affinity
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* aggregate-anti-affinity
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Note, that if openstackclient is used, it is needed to overwrite
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``OS_COMPUTE_API_VERSION`` environment variable to value ``2.43``.
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Given, that we are working on devstack, and have available four Ironic nodes,
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basic flow to test it is as follows:
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.. code:: shell-session
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$ export OS_COMPUTE_API_VERSION=2.43
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$ openstack aggregate create rack1
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$ openstack aggregate create rack2
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$ openstack aggregate add host rack1 $(openstack baremetal node list|grep node-0|awk '{print $2}')
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$ openstack aggregate add host rack1 $(openstack baremetal node list|grep node-1|awk '{print $2}')
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$ openstack aggregate add host rack2 $(openstack baremetal node list|grep node-2|awk '{print $2}')
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$ openstack aggregate add host rack2 $(openstack baremetal node list|grep node-3|awk '{print $2}')
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$ openstack server group create --policy aggregate-anti-affinity group1
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$ openstack server create \
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--image=$(openstack image list|grep x86_64-disk| awk '{print $2}') \
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--flavor=1 \
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--nic net-id=$(openstack network list |grep private | awk '{print $2}') \
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--hint group=$(openstack server group list | grep group1 | awk '{print $2}') \
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instance1
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$ openstack server create \
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--image=$(openstack image list|grep x86_64-disk| awk '{print $2}') \
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--flavor=1 \
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--nic net-id=$(openstack network list |grep private | awk '{print $2}') \
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--hint group=$(openstack server group list | grep group1 | awk '{print $2}') \
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instance2
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this should place two ironic instances on two different `rack` aggregates.
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Creation of instances in a bulk
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===============================
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Unfortunately, creating instance in bulk isn't possible. Here is a full
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explanation.
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Currently, if we schedule a bulk creation for ironic instances, (or any bulk
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creation of instances) filtered_scheduler will perform a filtering on each
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available hosts on each requested instance.
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Let's take an example, that we have 4 available ironic hosts, divided in two
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groups with *aggregate-affinity* policy:
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.. code:: shell-session
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ubuntu@ubuntu ~/devstack ◆ (stable/ocata) $ openstack baremetal node list
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+--------------------------------------+--------+---------------+-------------+--------------------+-------------+
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| UUID | Name | Instance UUID | Power State | Provisioning State | Maintenance |
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+--------------------------------------+--------+---------------+-------------+--------------------+-------------+
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| 959734ed-8dda-4878-9d5c-ddd9a95b65ec | node-0 | None | power off | available | False |
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| c105d862-2eca-4845-901e-cd8194a39248 | node-1 | None | power off | available | False |
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| a204e33f-6803-4d92-ad47-5b6928e3cede | node-2 | None | power off | available | False |
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| 6ee27372-884d-4db4-af27-f697fffcb7c0 | node-3 | None | power off | available | False |
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+--------------------------------------+--------+---------------+-------------+--------------------+-------------+
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ubuntu@ubuntu ~/devstack ◆ (stable/ocata) $ openstack server group list
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+--------------------------------------+--------+--------------------+
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| ID | Name | Policies |
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+--------------------------------------+--------+--------------------+
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| 0b96ffc0-8e96-4613-b9a8-ea4e6c7ff0e8 | group1 | aggregate-affinity |
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+--------------------------------------+--------+--------------------+
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ubuntu@ubuntu ~/devstack ◆ (stable/ocata) $ openstack aggregate list
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+----+-------+-------------------+
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| ID | Name | Availability Zone |
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+----+-------+-------------------+
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| 1 | rack1 | None |
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| 2 | rack2 | None |
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+----+-------+-------------------+
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ubuntu@ubuntu ~/devstack ◆ (stable/ocata) $ openstack aggregate show rack1
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+-------------------+------------------------------------------------------------------------------------+
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| Field | Value |
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+-------------------+------------------------------------------------------------------------------------+
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| availability_zone | None |
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| created_at | 2018-02-21T08:10:35.000000 |
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| deleted | False |
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| deleted_at | None |
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| hosts | [u'959734ed-8dda-4878-9d5c-ddd9a95b65ec', u'c105d862-2eca-4845-901e-cd8194a39248'] |
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| id | 1 |
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| name | rack1 |
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| properties | |
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| updated_at | None |
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| uuid | bf7a251a-edff-4688-81d7-d6cf8b201847 |
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+-------------------+------------------------------------------------------------------------------------+
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ubuntu@ubuntu ~/devstack ◆ (stable/ocata) $ openstack aggregate show rack2
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+-------------------+------------------------------------------------------------------------------------+
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| Field | Value |
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+-------------------+------------------------------------------------------------------------------------+
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| availability_zone | None |
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| created_at | 2018-02-21T08:10:37.000000 |
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| deleted | False |
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| deleted_at | None |
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| hosts | [u'a204e33f-6803-4d92-ad47-5b6928e3cede', u'6ee27372-884d-4db4-af27-f697fffcb7c0'] |
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| id | 2 |
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| name | rack2 |
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| properties | |
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| updated_at | None |
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| uuid | 7ca81b0e-2a87-4d41-af1b-b688aedc7b25 |
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+-------------------+------------------------------------------------------------------------------------+
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Next, given that we are able to have only two nodes in each aggregare, lets
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create two instances in a bulk:
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.. code:: shell-session
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ubuntu@ubuntu ~/devstack ◆ (stable/ocata) $ openstack server create \
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--image=$(openstack image list|grep x86_64-disk|awk '{print $2}') \
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--flavor=1 \
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--nic net-id=$(openstack network list|grep private|awk '{print $2}') \
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--hint group=$(openstack server group list|grep group1|awk '{print $2}') \
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--min 2 --max 2 instance
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which will results running a filters, like those from scheduler logs:
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.. code:: shell-session
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:number-lines:
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2018-02-21 09:16:53.303 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter RetryFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.304 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter AvailabilityZoneFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.304 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter RamFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.304 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter DiskFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.305 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ComputeFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.305 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ComputeCapabilitiesFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.305 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ImagePropertiesFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.305 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAntiAffinityFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.306 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAffinityFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.306 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter SameHostFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.306 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter DifferentHostFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.306 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAggregateAffinityFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.307 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAggregateAntiAffinityFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.307 DEBUG nova.scheduler.filter_scheduler [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filtered [(ubuntu, c105d862-2eca-4845-901e-cd8194a39248) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, (ubuntu, a204e33f-6803-4d92-ad47-5b6928e3cede) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, (ubuntu, 6ee27372-884d-4db4-af27-f697fffcb7c0) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, (ubuntu, 959734ed-8dda-4878-9d5c-ddd9a95b65ec) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0] from (pid=11395) _schedule /opt/stack/nova/nova/scheduler/filter_scheduler.py:115
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2018-02-21 09:16:53.307 DEBUG nova.scheduler.filter_scheduler [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Weighed [WeighedHost [host: (ubuntu, c105d862-2eca-4845-901e-cd8194a39248) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, weight: 2.0], WeighedHost [host: (ubuntu, a204e33f-6803-4d92-ad47-5b6928e3cede) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, weight: 2.0], WeighedHost [host: (ubuntu, 6ee27372-884d-4db4-af27-f697fffcb7c0) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, weight: 2.0], WeighedHost [host: (ubuntu, 959734ed-8dda-4878-9d5c-ddd9a95b65ec) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, weight: 2.0]] from (pid=11395) _schedule /opt/stack/nova/nova/scheduler/filter_scheduler.py:120
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2018-02-21 09:16:53.308 DEBUG nova.scheduler.filter_scheduler [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Selected host: WeighedHost [host: (ubuntu, a204e33f-6803-4d92-ad47-5b6928e3cede) ram: 1280MB disk: 10240MB io_ops: 0 instances: 0, weight: 2.0] from (pid=11395) _schedule /opt/stack/nova/nova/scheduler/filter_scheduler.py:127
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2018-02-21 09:16:53.308 DEBUG oslo_concurrency.lockutils [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Lock "(u'ubuntu', u'a204e33f-6803-4d92-ad47-5b6928e3cede')" acquired by "nova.scheduler.host_manager._locked" :: waited 0.000s from (pid=11395) inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:270
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2018-02-21 09:16:53.308 DEBUG oslo_concurrency.lockutils [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Lock "(u'ubuntu', u'a204e33f-6803-4d92-ad47-5b6928e3cede')" released by "nova.scheduler.host_manager._locked" :: held 0.000s from (pid=11395) inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:282
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2018-02-21 09:16:53.308 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Starting with 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:70
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so, for the first iteration, filters return all four nodes (new aggregate
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filters are on lines 12 and 13), which can be used to fulfill the request. Next
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second iteration is done:
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.. code:: shell-session
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:number-lines:
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2018-02-21 09:16:53.310 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter RetryFilter returned 4 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.310 DEBUG nova.scheduler.filters.ram_filter [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] (ubuntu, a204e33f-6803-4d92-ad47-5b6928e3cede) ram: 0MB disk: 0MB io_ops: 0 instances: 0 does not have 512 MB usable ram, it only has 0.0 MB usable ram. from (pid=11395) host_passes /opt/stack/nova/nova/scheduler/filters/ram_filter.py:61
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2018-02-21 09:16:53.310 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter RamFilter returned 3 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.310 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter DiskFilter returned 3 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.310 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAntiAffinityFilter returned 3 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.311 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAffinityFilter returned 3 host(s) from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:104
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2018-02-21 09:16:53.311 DEBUG nova.scheduler.filters.affinity_filter [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] aggregate-affinity: check if set([1]) is a subset of set([]),host nodes: set([u'ubuntu']) from (pid=11395) host_passes /opt/stack/nova/nova/scheduler/filters/affinity_filter.py:213
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2018-02-21 09:16:53.311 DEBUG nova.scheduler.filters.affinity_filter [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] aggregate-affinity: check if set([2]) is a subset of set([]),host nodes: set([u'ubuntu']) from (pid=11395) host_passes /opt/stack/nova/nova/scheduler/filters/affinity_filter.py:213
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2018-02-21 09:16:53.311 DEBUG nova.scheduler.filters.affinity_filter [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] aggregate-affinity: check if set([1]) is a subset of set([]),host nodes: set([u'ubuntu']) from (pid=11395) host_passes /opt/stack/nova/nova/scheduler/filters/affinity_filter.py:213
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2018-02-21 09:16:53.312 INFO nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filter ServerGroupAggregateAffinityFilter returned 0 hosts
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2018-02-21 09:16:53.312 DEBUG nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filtering removed all hosts for the request with instance ID '9a7f787c-5074-4af3-80a2-38eaecf882a2'. Filter results: [('RetryFilter', [(u'ubuntu', u'c105d862-2eca-4845-901e-cd8194a39248'), (u'ubuntu', u'a204e33f-6803-4d92-ad47-5b6928e3cede'), (u'ubuntu', u'6ee27372-884d-4db4-af27-f697fffcb7c0'), (u'ubuntu', u'959734ed-8dda-4878-9d5c-ddd9a95b65ec')]), ('RamFilter', [(u'ubuntu', u'c105d862-2eca-4845-901e-cd8194a39248'), (u'ubuntu', u'6ee27372-884d-4db4-af27-f697fffcb7c0'), (u'ubuntu', u'959734ed-8dda-4878-9d5c-ddd9a95b65ec')]), ('DiskFilter', [(u'ubuntu', u'c105d862-2eca-4845-901e-cd8194a39248'), (u'ubuntu', u'6ee27372-884d-4db4-af27-f697fffcb7c0'), (u'ubuntu', u'959734ed-8dda-4878-9d5c-ddd9a95b65ec')]), ('ServerGroupAntiAffinityFilter', [(u'ubuntu', u'c105d862-2eca-4845-901e-cd8194a39248'), (u'ubuntu', u'6ee27372-884d-4db4-af27-f697fffcb7c0'), (u'ubuntu', u'959734ed-8dda-4878-9d5c-ddd9a95b65ec')]), ('ServerGroupAffinityFilter', [(u'ubuntu', u'c105d862-2eca-4845-901e-cd8194a39248'), (u'ubuntu', u'6ee27372-884d-4db4-af27-f697fffcb7c0'), (u'ubuntu', u'959734ed-8dda-4878-9d5c-ddd9a95b65ec')]), ('ServerGroupAggregateAffinityFilter', None)] from (pid=11395) get_filtered_objects /opt/stack/nova/nova/filters.py:129
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2018-02-21 09:16:53.312 INFO nova.filters [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Filtering removed all hosts for the request with instance ID '9a7f787c-5074-4af3-80a2-38eaecf882a2'. Filter results: ['RetryFilter: (start: 4, end: 4)', 'RamFilter: (start: 4, end: 3)', 'DiskFilter: (start: 3, end: 3)', 'ServerGroupAntiAffinityFilter: (start: 3, end: 3)', 'ServerGroupAffinityFilter: (start: 3, end: 3)', 'ServerGroupAggregateAffinityFilter: (start: 3, end: 0)']
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2018-02-21 09:16:53.312 DEBUG nova.scheduler.filter_scheduler [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] There are 1 hosts available but 2 instances requested to build. from (pid=11395) select_destinations /opt/stack/nova/nova/scheduler/filter_scheduler.py:76
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2018-02-21 09:16:53.312 DEBUG oslo_messaging.rpc.server [req-6b671371-ea58-4b1d-8657-a6376d2d1d88 admin admin] Expected exception during message handling () from (pid=11395) _process_incoming /usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py:158
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This time, as we can see in line 10, *ServerGroupAffinityFilter* returns 0
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hosts. A log lines 7-9 gives us a hint, that none of the candidates fulfill
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requirement, which looks like this (I've removed some comments and non
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interesting parts for readability):
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.. code:: python
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:number-lines:
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def host_passes(self, host_state, spec_obj):
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# ...
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host_aggs = set(agg.id for agg in host_state.aggregates)
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if not host_aggs:
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return self.REVERSE_CHECK
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# Take all hypervisors nodenames and hostnames
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host_nodes = set(spec_obj.instance_group.nodes +
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spec_obj.instance_group.hosts)
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if not host_nodes:
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# There are no members of the server group yet
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return True
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# Grab all aggregates for all hosts in the server group and ensure we
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# have an intersection with this host's aggregates
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group_aggs = set()
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for node in host_nodes:
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group_aggs |= self.host_manager.host_aggregates_map[node]
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LOG.debug(...)
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if self.REVERSE_CHECK:
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return host_aggs.isdisjoint(group_aggs)
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return host_aggs.issubset(group_aggs
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In this filter first we check if host belongs to any aggregate and store it as
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a set. If there is an empty set, it means that node either cannot satisfy
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aggregate affinity constraint in case of *aggregate-affinity* policy or it's
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does satisfy the constraint in case of *aggregate-anti-affinity*.
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Next, there is a check for ``instance_group`` hosts and nodes (``nodes`` field
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is added for Ironic case, otherwise we don't have Ironic nodes hostnames other
|
||||
than… hostname which origin from compute service). In case there is no instance
|
||||
yet created, that means we can pass current host, since there is no hosts in
|
||||
the group yet.
|
||||
|
||||
If we have some nodenames/hostnames in the set, we trying to match host
|
||||
aggregates with the each nodenames/hostnames (line 20). And here is the issue.
|
||||
``instance_group`` provided by request spec object (``spec_obj``) have
|
||||
``hosts`` field filled out during scheduling, but ``nodes`` field not, until
|
||||
**there is an instance created**, so this is the reason why we can create
|
||||
instances one by one, but not in the bulk.
|
||||
|
||||
|
||||
.. _Jay Pipes series: https://review.openstack.org/#/q/topic:bp/aggregate-affinity
|
||||
Reference in New Issue
Block a user