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With object storage enabled, calling `#filename` on an upload does this:
1. Call the `#filename` method on the CarrierWave object.
2. Generate the URL for that object.
3. If the uploader isn't public, do so by generating an authenticated
URL, including signing that request.
That's all correct behaviour, but for the case where we use `#filename`,
it's typically to generate a GitLab URL. That URL doesn't need to be
signed because we do our own auth.
Signing the URLs can be very expensive, especially in batch (say, we
need to get the avatar URLs for 150 users in one request). It's all
unnecessary work. If we used the `RecordsUploads` concern, we have
already recorded a `path` in the database. That `path` is actually
generated from CarrierWave's `#filename` at upload time, so we don't
need to recompute it - we can just use it and strip off the prefix if
it's available.
On a sample users autocomplete URL, at least 10% of the time before this
change went to signing URLs. After this change, we spend no time in URL
signing, and still get the correct results.
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`spec/features/uploads/user_uploads_file_to_note_spec.rb` was failing in
master because MySQL detected a deadlock when a DELETE and INSERT for
the same indexed item occurred within a transaction in the `uploads`
table. Due to InnoDB's next-key locking algorithm
(innodb_locks_unsafe_for_binlog in
https://dev.mysql.com/doc/refman/5.5/en/innodb-parameters.html), InnoDB
sets an exclusive lock for any of the indexed records it encounters, so
the INSERT will fail until the DELETE is committed.
To fix this, we just disable the transaction for MySQL and keep
it for PostgreSQL.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55161
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This whitelists all existing offenses for the various CodeReuse cops, of
which most are triggered by the CodeReuse/ActiveRecord cop.
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Partially addresses #47424.
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Fix migrate! method (Minimal fix with ExclusiveLock to prevent race conditions)
Closes #4928 and #4980
See merge request gitlab-org/gitlab-ee!4624
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