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# frozen_string_literal: true
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class SchedulePopulateMergeRequestAssigneesTable < ActiveRecord::Migration[5.0]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 10_000
MIGRATION = 'PopulateMergeRequestAssigneesTable'
DELAY_INTERVAL = 8.minutes.to_i
disable_ddl_transaction!
def up
say 'Scheduling `PopulateMergeRequestAssigneesTable` jobs'
# We currently have ~4_500_000 merge request records on GitLab.com.
# This means it'll schedule ~450 jobs (10k MRs each) with a 8 minutes gap,
# so this should take ~60 hours for all background migrations to complete.
queue_background_migration_jobs_by_range_at_intervals(MergeRequest, MIGRATION, DELAY_INTERVAL, batch_size: BATCH_SIZE)
end
end
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