- 08 12月, 2018 1 次提交
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由 Zeger-Jan van de Weg 提交于
When a project is forked, the new repository used to be a deep copy of everything stored on disk by leveraging `git clone`. This works well, and makes isolation between repository easy. However, the clone is at the start 100% the same as the origin repository. And in the case of the objects in the object directory, this is almost always going to be a lot of duplication. Object Pools are a way to create a third repository that essentially only exists for its 'objects' subdirectory. This third repository's object directory will be set as alternate location for objects. This means that in the case an object is missing in the local repository, git will look in another location. This other location is the object pool repository. When Git performs garbage collection, it's smart enough to check the alternate location. When objects are duplicated, it will allow git to throw one copy away. This copy is on the local repository, where to pool remains as is. These pools have an origin location, which for now will always be a repository that itself is not a fork. When the root of a fork network is forked by a user, the fork still clones the full repository. Async, the pool repository will be created. Either one of these processes can be done earlier than the other. To handle this race condition, the Join ObjectPool operation is idempotent. Given its idempotent, we can schedule it twice, with the same effect. To accommodate the holding of state two migrations have been added. 1. Added a state column to the pool_repositories column. This column is managed by the state machine, allowing for hooks on transitions. 2. pool_repositories now has a source_project_id. This column in convenient to have for multiple reasons: it has a unique index allowing the database to handle race conditions when creating a new record. Also, it's nice to know who the host is. As that's a short link to the fork networks root. Object pools are only available for public project, which use hashed storage and when forking from the root of the fork network. (That is, the project being forked from itself isn't a fork) In this commit message I use both ObjectPool and Pool repositories, which are alike, but different from each other. ObjectPool refers to whatever is on the disk stored and managed by Gitaly. PoolRepository is the record in the database.
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- 30 11月, 2018 1 次提交
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由 Toon Claes 提交于
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- 28 11月, 2018 1 次提交
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由 Zeger-Jan van de Weg 提交于
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- 27 11月, 2018 1 次提交
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由 Zeger-Jan van de Weg 提交于
To separate the different kinds of repositories we have at GitLab this table will be renamed to pool_repositories. A project can, for now at least, be member of none, or one of these. The table will get additional columns in a later merge request where more logic is implemented for the model. Further included is a small refactor of logic around hashing ids for the disk_path, mainly to ensure a previous implementation is reusable. The disk_path for the pool_repositories table no longer has a NOT NULL constraint, but given the hashing of the ID requires the DB to assign the record an ID, an after_create hook is used to update the value. A related MR is: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23143, adding tables for 'normal' repositories and wiki_repositories.
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- 05 11月, 2018 1 次提交
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由 Nick Thomas 提交于
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