Revert the revert of Optimistic Locking (!5623) · Merge requests · GitLab.org / GitLab FOSS · GitLab

Valery Sizov requested to merge revert_revert_issuable_lock into master Aug 02, 2016

What does this MR do?

It reverts the revert of optimistic lock https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5146 (and revert MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5245)

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/19871

Actually the code is already reviewed, except:

Monkey patch config/initializers/ar_monkey_patch.rb
We removed default values from migration db/migrate/20160707104333_add_lock_to_issuables.rb