Cluster Upgrade
Outlines a framework and API for implementing cluster upgrades. DocImpact Change-Id: I51ccfd12a419ec93820621767db9232624b859a8
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Morgan Jones
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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Sections of this template were taken directly from the Nova spec
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template at:
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https://github.com/openstack/nova-specs/blob/master/specs/juno-template.rst
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..
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===============
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Cluster Upgrade
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===============
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.. If section numbers are desired, unindent this
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.. sectnum::
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.. If a TOC is desired, unindent this
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.. contents::
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Trove currently has support for upgrading since instances from one
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datastore version to another, but that functionality is lacking for
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clusters. This blueprint outlines a framework and API for
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implementing upgrades for clusters.
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Launchpad Blueprint:
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https://blueprints.launchpad.net/trove/+spec/cluster-upgrade
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Problem Description
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===================
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Trove does not currently support upgrading clusters to new datastore
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versions.
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Proposed Change
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===============
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Implement a new cluster-upgrade API for upgrading a cluster to a new
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datastore version.
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This blueprint will outline only the framework and API for
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implementing cluster upgrades. It will not detail the implementation
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of upgrade for any specific datastore as the implementation for each
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datastore may be different.
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If your specification proposes any changes to the Trove REST API such
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as changing parameters which can be returned or accepted, or even
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the semantics of what happens when a client calls into the API, then
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you should add the APIImpact flag to the commit message. Specifications with
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the APIImpact flag can be found with the following query:
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https://review.openstack.org/#/q/status:open+project:openstack/trove-specs+message:apiimpact,n,z
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Code snippets, etc. should be placed in appropriately marked blocks:
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.. code-block:: bash
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# This is a bash command
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ls -lf
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.. code-block:: python
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# sample code
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for count in range(1, 10):
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print count
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Configuration
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-------------
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No datastore agnostic configuration settings are envisioned. Setting
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for specific datastores will be detailed in the specifications for
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each datastore implementation.
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Database
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--------
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No database changes are envisioned.
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Public API
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----------
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A new REST API will be implemented for cluster-upgrade:
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Request::
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PATCH v1/{tenant_id}/cluster/{cluster_id}
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{
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"cluster":
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{
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"datastore_version": "<datastore_version_uuid>"
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}
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}
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Response::
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{
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}
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REST return codes::
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202 - Accepted.
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400 - BadRequest. Server could not understand request.
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404 - Not Found. <datastore_version_id> not found.
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Public API Security
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-------------------
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No security implications.
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Python API
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----------
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A new method will be implemented in the trove API. This method will
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upgrade a cluster to the image specified by the provided
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datastore_version.
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.. code-block:: python
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upgrade(cluster, datastore_version)
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:cluster: the cluster to upgrade
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:datastore_version: the datastore version, or its id, to which the
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trove cluster will be upgraded
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CLI (python-troveclient)
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------------------------
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A new CLI call will be implemented. This new call will upgrade a
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cluster to the image specified by the provided datastore_version.
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.. code-block:: bash
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trove cluster-upgrade <cluster> <datastore_version>
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:cluster: the cluster to upgrade
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:datastore_version: the datastore version to which the instance will
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be upgraded
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Internal API
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------------
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The implementation of upgrade for single instances will be used to
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upgrade the guest agent on an instance.
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Guest Agent
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-----------
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For the initial implementation it is expected that the existing pre
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and post upgrade methods will suffice.
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Alternatives
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------------
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Dashboard Impact (UX)
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=====================
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A new cluster action will be implemented to allow a cluster to be
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upgraded. Said functionality will be similar to the functionality for
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a single instance.
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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6-morgan
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Dashboard assignee:
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<launchpad-id or None>
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Milestones
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----------
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Target Milestone for completion:
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eg. Liberty-1
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Work Items
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----------
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The implementation of this has been posted and is ready for review
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subject to this spec being approved.
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Upgrade Implications
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====================
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No upgrade implications.
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Dependencies
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============
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Testing
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=======
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No int tests will be included with this change as this is only a
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framework without implementations for specific datastores.
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Documentation Impact
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====================
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What is the impact on the docs team of this change? Some changes might require
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donating resources to the docs team to have the documentation updated. Don't
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repeat details discussed above, but please reference them here.
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References
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==========
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None.
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Appendix
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========
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None.
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