presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorConnector.java/RaptorConnector/unblockMaintenance
class RaptorConnector:    private void unblockMaintenance(long tableId)
    {
        try {
            dao.unblockMaintenance(tableId);
        }
        catch (Throwable t) {
            log.warn(t, "Failed to unblock maintenance for table ID %s, will retry", tableId);
            unblockMaintenanceExecutor.schedule(() -> unblockMaintenance(tableId), 2, SECONDS);
        }
    }