138 lines
7.0 KiB
ReStructuredText
138 lines
7.0 KiB
ReStructuredText
.. _pike-priorities:
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=======================
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Pike Project Priorities
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=======================
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List of efforts the Nova development team is prioritizing for reviews in the
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Pike release (in no particular order).
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+-------------------------------------------+-----------------------+
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| Priority | Primary Contacts |
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+===========================================+=======================+
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| `Cells V2`_ | `Dan Smith`_ |
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| | `Melanie Witt`_ |
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+-------------------------------------------+-----------------------+
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| `Placement`_ | `Jay Pipes`_ |
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| | `Sylvain Bauza`_ |
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| | `Chris Dent`_ |
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| | `Ed Leafe`_ |
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| | `Alex Xu`_ |
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+-------------------------------------------+-----------------------+
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| `Integrate Cinder 3.27`_ | `John Garbutt`_ |
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| | `Matt Riedemann`_ |
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+-------------------------------------------+-----------------------+
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| `Run API under WSGi (Community Goal)`_ | `Chris Dent`_ |
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| | `Sean Dague`_ |
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+-------------------------------------------+-----------------------+
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| `Support Python 3.5 (Community Goal)`_ | `ChangBo Guo`_ |
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+-------------------------------------------+-----------------------+
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.. _Dan Smith: https://launchpad.net/~danms
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.. _Melanie Witt: https://launchpad.net/~melwitt
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.. _Jay Pipes: https://launchpad.net/~jaypipes
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.. _Sylvain Bauza: https://launchpad.net/~sylvain-bauza
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.. _Chris Dent: https://launchpad.net/~cdent
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.. _Ed Leafe: https://launchpad.net/~ed-leafe
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.. _Alex Xu: https://launchpad.net/~xuhj
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.. _John Garbutt: https://launchpad.net/~johngarbutt
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.. _Matt Riedemann: https://launchpad.net/~mriedem
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.. _Sean Dague: https://launchpad.net/~sdague
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.. _ChangBo Guo: https://launchpad.net/~glongwave
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Cells v2
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--------
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A single-cell cells v2 deployment was made required in the Ocata release.
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In Pike, the goal is to support multiple cells v2 cells in a deployment. There
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are several priority efforts to get us there.
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* `Cells-aware API`_: Many of the nova-api entry points will not know about
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cells properly to pass their operations through to the appropriate
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connection so we need to make them cell-aware.
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* `Quotas in the API cell`_: The quotas tables have moved to the API database
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but we want to avoid an 'up-call' from the compute cells to the API when
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handling quota commits and rollbacks. With cells v2 we have an opportunity to
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rethink how Nova supports counting resources and tracking quota, so this
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effort aims to move quota handling to a more simplified solution which is
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more eventually consistent and avoids invalid over-quota failures by design.
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* Support a simple python merge operation when sorting and/or filtering a list
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of instances across multiple cells. Long-term this may be handled by
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`Searchlight`_ but for Pike we will have a simple but albeit less performant
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solution.
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* Continuous integration testing of multiple cells v2 cells with a multi-node
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job.
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.. note:: Move operations across cells, such as live migration, will not be supported in the
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Pike release, but may be a focus for a future release.
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.. _Cells-aware API: https://blueprints.launchpad.net/nova/+spec/cells-aware-api
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.. _Quotas in the API cell: ../specs/pike/approved/cells-count-resources-to-check-quota-in-api.html
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.. _Searchlight: ../specs/pike/approved/list-instances-using-searchlight.html
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Placement
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---------
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The Placement service was made required in the Ocata release.
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In Pike, the goals focus on expanding the capabilities of the Placement service
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and leverage those to fix some long-standing architectural issues within Nova.
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* `Resource provider traits`_: This allows modeling of qualitative information
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about resource providers. For example, in Ocata we know quantitative
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information about a resource provider, such as how much DISK_GB inventory it
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has. Traits allow the system to model the type of disk, e.g. HDD or SDD.
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Traits will also be used to model resource provider aggregate relationships
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for things like shared storage pools.
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* `Custom resource classes`_: This is continuing work from Ocata to have the
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Ironic compute driver provide Ironic node resource class information to the
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placement service which will eventually be used for scheduling decisions.
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* `Claim resources during scheduling`_: This is a refactor to move resource
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claims out of the compute service ResourceTracker and into the controller
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service(s) during scheduling which should drastically reduce build retries
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due to resource contention in a pack-oriented scheduling configuration. This
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is also needed to avoid 'up-calls' from computes to controller services in
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a multi-cell deployment.
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* `Handle aggregate resources`_: This is continuing work from Ocata where we
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need to be able to model resource provider aggregates for things like shared
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storage and IP allocation pools. Then the resource tracker in the compute
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nodes can pull this information from the placement service when a request is
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made for shared storage in a compute node within a particular aggregate. The
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allocation claim is then made on the resource provider rather than the
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compute node.
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.. _Resource provider traits: ../specs/pike/approved/resource-provider-traits.html
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.. _Custom resource classes: ../specs/ocata/implemented/custom-resource-classes.html
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.. _Claim resources during scheduling: ../specs/pike/approved/placement-claims.html
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.. _Handle aggregate resources: ../specs/newton/implemented/generic-resource-pools.html
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Integrate Cinder 3.27
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---------------------
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In Ocata, Cinder provided the `3.27 microversion`_. In Pike, Nova will use the
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3.27 API to `attach and detach volumes`_. This is an effort to reduce technical
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debt and state management between both the Nova and Cinder projects by
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abstracting volume attachment state information in Cinder where it belongs.
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This is also a pre-requisite to support attaching multiple instances to the
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same volume, which will likely be a priority in a future release.
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.. _3.27 microversion: https://specs.openstack.org/openstack/cinder-specs/specs/ocata/add-new-attach-apis.html
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.. _attach and detach volumes: ../specs/pike/approved/cinder-new-attach-apis.html
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Run API under WSGi (Community Goal)
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-----------------------------------
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This is a community-wide release goal for Pike. The goal for Nova is to
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support, and test, running `nova-api under WSGI`_.
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.. _nova-api under WSGI: https://governance.openstack.org/tc/goals/pike/deploy-api-in-wsgi.html
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Support Python 3.5 (Community Goal)
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-----------------------------------
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This is a community-wide release goal for Pike. The goal for Nova is to
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support, and test, running with `python 3.5`_.
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.. _python 3.5: https://governance.openstack.org/tc/goals/pike/python35.html
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