Add migration to cleanup iid records

parent 4ac06d34
# frozen_string_literal: true
class DeleteInconsistentInternalIdRecords2 < ActiveRecord::Migration[5.0]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
# This migration cleans up any inconsistent records in internal_ids.
#
# That is, it deletes records that track a `last_value` that is
# smaller than the maximum internal id (usually `iid`) found in
# the corresponding model records.
def up
disable_statement_timeout do
delete_internal_id_records('milestones', 'project_id')
delete_internal_id_records('milestones', 'namespace_id', 'group_id')
end
end
class InternalId < ActiveRecord::Base
self.table_name = 'internal_ids'
enum usage: { issues: 0, merge_requests: 1, deployments: 2, milestones: 3, epics: 4, ci_pipelines: 5 }
end
private
def delete_internal_id_records(base_table, scope_column_name, base_scope_column_name = scope_column_name)
sql = <<~SQL
SELECT id FROM ( -- workaround for MySQL
SELECT internal_ids.id FROM (
SELECT #{base_scope_column_name} AS #{scope_column_name}, max(iid) as maximum_iid from #{base_table} GROUP BY #{scope_column_name}
) maxima JOIN internal_ids USING (#{scope_column_name})
WHERE internal_ids.usage=#{InternalId.usages.fetch(base_table)} AND maxima.maximum_iid > internal_ids.last_value
) internal_ids
SQL
InternalId.where("id IN (#{sql})").tap do |ids| # rubocop:disable GitlabSecurity/SqlInjection
say "Deleting internal_id records for #{base_table}: #{ids.map { |i| [i.project_id, i.last_value] }}" unless ids.empty?
end.delete_all
end
end
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