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Diffstat (limited to 'doc/development/merge_request_concepts/diffs/development.md')
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diff --git a/doc/development/merge_request_concepts/diffs/development.md b/doc/development/merge_request_concepts/diffs/development.md index 1c22eff34db..37d87d4e4eb 100644 --- a/doc/development/merge_request_concepts/diffs/development.md +++ b/doc/development/merge_request_concepts/diffs/development.md @@ -72,6 +72,14 @@ contents, individual commits, and the files containing changes. Diff content is usually accessed through this class. Logic is often applied to diff, file, and commit content before it is returned to a user. +#### `MergeRequestDiff#commits_count` + +When `MergeRequestDiff` is saved, associated `MergeRequestDiffCommit` records are +counted and cached into the `commits_count` column. This number displays on the +merge request page as the counter for the **Commits** tab. + +If `MergeRequestDiffCommit` records are deleted, the counter doesn't update. + ### `MergeRequestDiffCommit` `MergeRequestDiffCommit` is defined in `app/models/merge_request_diff_commit.rb`. @@ -119,6 +127,23 @@ relationship to the change, such as: - Its ordering in the diff. - The raw diff output itself. +#### External diff storage + +By default, diff data of a `MergeRequestDiffFile` is stored in `diff` column in +the `merge_request_diff_files` table. On some installations, the table can grow +too large, so they're configured to store diffs on external storage to save space. +To configure it, see [Merge request diffs storage](../../../administration/merge_request_diffs.md). + +When configured to use external storage: + +- The `diff` column in the database is left `NULL`. +- The associated `MergeRequestDiff` record sets the `stored_externally` attribute + to `true` on creation of `MergeRequestDiff`. + +A cron job named `ScheduleMigrateExternalDiffsWorker` is also scheduled at +minute 15 of every hour. This migrates `diff` that are still stored in the +database to external storage. + ### `MergeRequestDiffDetail` `MergeRequestDiffDetail` is defined in `app/models/merge_request_diff_detail.rb`. |