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This patchset adds developer overview documentation for providing a high-level introduction to Deckhand, including its architecture, modules, test utilities, Helm utilities, and other errata. This work is based off this Drydock patchset: https://review.openstack.org/#/c/571298/ Change-Id: Ic3382d4e04edf02a65184651d272fe9cd1db56a4
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Revision History
Revision History
Documents will be ingested in batches which will be given a revision index. This provides a common language for describing complex validations on sets of documents.
Revisions can be thought of as commits in a linear git history, thus looking at a revision includes all content from previous revisions.
Revision Diffing
By maintaining a linear history of all the documents in each revision, Deckhand is able to diff different revisions together to report what has changed across revisions, allowing external services to determine whether the Deckhand configuration undergone any changes since the service last queried the Deckhand API.
The revision difference is calculated by comparing the overall difference across all the documents in
the buckets associated with the two revisions that are diffed. For
example, if a bucket shared between two revisions contains two
documents, and between the first revision and the second revision, if
only one of those two documents has been modified, the bucket itself is
tagged as modified. For more information about revision
diffing, please reference the api-ref.
Revision Rollback
As all the changes to documents are maintained via revisions, it is
possible to rollback the latest revision in Deckhand to a prior
revision. This behavior can be loosely compared to a
git rebase in which it is possible to squash the latest
revision in order to go back to the previous revision. This behavior is
useful for undoing accidental changes and returning to a stable internal
configuration.