debian-mirror-gitlab/lib/gitlab/background_migration/cleanup_optimistic_locking_nulls.rb

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2020-04-08 14:13:33 +05:30
# frozen_string_literal: true
# rubocop:disable Style/Documentation
module Gitlab
module BackgroundMigration
class CleanupOptimisticLockingNulls
QUERY_ITEM_SIZE = 1_000
# table - The name of the table the migration is performed for.
# start_id - The ID of the object to start at
# stop_id - The ID of the object to end at
def perform(start_id, stop_id, table)
model = define_model_for(table)
# After analysis done, a batch size of 1,000 items per query was found to be
# the most optimal. Discussion in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18418#note_282285336
(start_id..stop_id).each_slice(QUERY_ITEM_SIZE).each do |range|
model
.where(lock_version: nil)
.where("ID BETWEEN ? AND ?", range.first, range.last)
.update_all(lock_version: 0)
end
end
def define_model_for(table)
Class.new(ActiveRecord::Base) do
self.table_name = table
end
end
end
end
end