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class DeleteInconsistentInternalIdRecords < ActiveRecord::Migration
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
delete_internal_id_records('issues', 'project_id')
delete_internal_id_records('merge_requests', 'project_id', 'target_project_id')
delete_internal_id_records('deployments', 'project_id')
delete_internal_id_records('milestones', 'project_id')
delete_internal_id_records('milestones', 'namespace_id', 'group_id')
delete_internal_id_records('ci_pipelines', 'project_id')
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 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=#{usage_for(base_table)} AND maxima.maximum_iid > internal_ids.last_value
SQL
InternalId.transaction do
ids = InternalId.where("id IN (#{sql})") # rubocop:disable GitlabSecurity/SqlInjection
ids.each do |id|
say "Deleting internal_id record for #{base_table}, project_id=#{id.project_id}, last_value=#{id.last_value}"
end
ids.destroy_all
end
end
def usage_for(base_table)
InternalId.usages[base_table] || raise("unknown base_table '#{base_table}'")
end
end
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