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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 CleanupOptimisticLockingNulls < ActiveRecord::Migration[5.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
TABLES = %w(epics merge_requests issues).freeze
BATCH_SIZE = 10_000
def declare_class(table)
Class.new(ActiveRecord::Base) do
include EachBatch
self.table_name = table
self.inheritance_column = :_type_disabled # Disable STI
end
end
def up
TABLES.each do |table|
add_concurrent_index table.to_sym, :lock_version, where: "lock_version IS NULL"
queue_background_migration_jobs_by_range_at_intervals(
declare_class(table).where(lock_version: nil),
'CleanupOptimisticLockingNulls',
2.minutes,
batch_size: BATCH_SIZE,
other_job_arguments: [table]
)
end
end
def down
TABLES.each do |table|
remove_concurrent_index table.to_sym, :lock_version, where: "lock_version IS NULL"
end
end
end
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