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author | Stan Hu <stanhu@gmail.com> | 2019-08-22 10:19:44 +0300 |
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committer | Stan Hu <stanhu@gmail.com> | 2019-08-23 08:28:47 +0300 |
commit | e24b9c2502613cc0df5b2a676236d1c36c02bca4 (patch) | |
tree | 8384f8dbb4fa2ca6ebebed3cfd774e81371a859f /lib/api/notes.rb | |
parent | ba67965ac5386164a38acda32ff4e547e61b0376 (diff) |
Eliminate Gitaly N+1 queries with notes API
Similar to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31834,
we see that in https://gitlab.com/gitlab-org/gitlab-ce/issues/65957
there can be hundreds, even thousands, of Gitaly requests in the
`/api/:version/projects/:id/merge_requests/:noteable_id/notes` endpoint.
Previously, the API to retrieve notes generated hundreds of Gitaly calls
to determine whether a system note should be shown to the user. It did
this by:
1. Rendering the Markdown
2. Extracting cross-references from the Markdown
3. Issuing a Gitaly `FindCommit` RPC for every reference to validate
that the commit exists.
The last step is unnecessary because we don't need to display a commit
if the user doesn't have access to the project in the first place.
`RendersNotes#prepare_notes_for_rendering` is already used in
`MergeRequestsController`, which is why we don't see N+1 Gitaly calls
there. We use it here to optimize the note redaction process.
Diffstat (limited to 'lib/api/notes.rb')
-rw-r--r-- | lib/api/notes.rb | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/lib/api/notes.rb b/lib/api/notes.rb index 9381f045144..84563d66ee8 100644 --- a/lib/api/notes.rb +++ b/lib/api/notes.rb @@ -36,12 +36,13 @@ module API # page can have less elements than :per_page even if # there's more than one page. raw_notes = noteable.notes.with_metadata.reorder(order_options_with_tie_breaker) - notes = - # paginate() only works with a relation. This could lead to a - # mismatch between the pagination headers info and the actual notes - # array returned, but this is really a edge-case. - paginate(raw_notes) - .reject { |n| n.cross_reference_not_visible_for?(current_user) } + + # paginate() only works with a relation. This could lead to a + # mismatch between the pagination headers info and the actual notes + # array returned, but this is really a edge-case. + notes = paginate(raw_notes) + notes = prepare_notes_for_rendering(notes) + notes = notes.reject { |n| n.cross_reference_not_visible_for?(current_user) } present notes, with: Entities::Note end # rubocop: enable CodeReuse/ActiveRecord |