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class ScheduleMergeRequestLatestMergeRequestDiffIdMigrations < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
BATCH_SIZE = 50_000
MIGRATION = 'PopulateMergeRequestsLatestMergeRequestDiffId'
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
self.table_name = 'merge_requests'
include ::EachBatch
end
# On GitLab.com, we saw that we generated about 500,000 dead tuples over 5 minutes.
# To keep replication lag from ballooning, we'll aim for 50,000 updates over 5 minutes.
#
# Assuming that there are 5 million rows affected (which is more than on
# GitLab.com), and that each batch of 50,000 rows takes up to 5 minutes, then
# we can migrate all the rows in 8.5 hours.
def up
MergeRequest.where(latest_merge_request_diff_id: nil).each_batch(of: BATCH_SIZE) do |relation, index|
range = relation.pluck('MIN(id)', 'MAX(id)').first
BackgroundMigrationWorker.perform_in(index * 5.minutes, MIGRATION, range)
end
end
end
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