44 lines
2.4 KiB
YAML
44 lines
2.4 KiB
YAML
---
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prelude: |
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The 16.0.0 release includes many new features and bug fixes. It is
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difficult to cover all the changes that have been introduced. Please at
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least read the upgrade section which describes the required actions to
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upgrade your cloud from 15.0.0 (Ocata) to 16.0.0 (Pike).
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That said, a few major changes are worth mentioning. This is not an
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exhaustive list:
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- The latest Compute API microversion supported for Ocata is v2.53. Details
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on REST API microversions added since the 15.0.0 Ocata release can be
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found in the `REST API Version History`_ page.
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- The FilterScheduler driver now provides allocations to the Placement API,
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which helps concurrent schedulers to verify resource consumptions
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directly without waiting for compute services to ask for a reschedule in
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case of a race condition. That is an important performance improvement
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that includes allowing one to use more than one scheduler worker if
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there are capacity concerns. For more details, see the
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`Pike Upgrade Notes for Placement`_.
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- Nova now supports a Cells v2 multi-cell deployment. The default
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deployment is a single cell. There are known `limitations with
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multiple cells`_. Refer to the `Cells v2 Layout`_ page for more
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information about deploying multiple cells.
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- Cells v1 is now deprecated in favor of Cells v2.
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- The quota system has been reworked to `count resources`_ at the point of
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creation rather than using a reserve/commit/rollback approach. No
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operator impacts are expected.
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- Compute-specific documentation is being migrated from
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http://docs.openstack.org to https://docs.openstack.org/nova/ and the
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layout for the Nova developer documentation is being re-organized. If you
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think anything is missing or you now have broken bookmarks, please
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`report a bug`_.
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.. _Pike Upgrade Notes for Placement: https://docs.openstack.org/nova/latest/user/placement.html#pike-16-0-0
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.. _limitations with multiple cells: https://docs.openstack.org/nova/latest/user/cellsv2_layout.html#caveats-of-a-multi-cell-deployment
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.. _Cells v2 Layout: https://docs.openstack.org/nova/latest/user/cellsv2_layout.html
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.. _count resources: https://specs.openstack.org/openstack/nova-specs/specs/pike/approved/cells-count-resources-to-check-quota-in-api.html
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.. _report a bug: https://bugs.launchpad.net/nova/
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