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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 ScheduleMergeRequestAnyApprovalRuleMigration < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 5_000
MIGRATION = 'PopulateAnyApprovalRuleForMergeRequests'
DELAY_INTERVAL = 8.minutes.to_i
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
include EachBatch
self.table_name = 'merge_requests'
scope :with_approvals_before_merge, -> { where('approvals_before_merge <> 0') }
end
def up
add_concurrent_index :merge_requests, :id,
name: 'tmp_merge_requests_with_approvals_before_merge',
where: 'approvals_before_merge <> 0'
say "Scheduling `#{MIGRATION}` jobs"
# We currently have ~440_000 merge request records with non-zero approvals_before_merge on GitLab.com.
# This means it'll schedule ~88 jobs (5k merge requests each) with a 8 minutes gap,
# so this should take ~12 hours for all background migrations to complete.
#
# The approximate expected number of affected rows is: 190k
queue_background_migration_jobs_by_range_at_intervals(
ScheduleMergeRequestAnyApprovalRuleMigration::MergeRequest.with_approvals_before_merge,
MIGRATION, DELAY_INTERVAL, batch_size: BATCH_SIZE)
remove_concurrent_index_by_name(:merge_requests, 'tmp_merge_requests_with_approvals_before_merge')
end
def down
# no-op
end
end
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