if ( $pos ) {
$this->logger->debug( __METHOD__ . ": LB for '$masterName' has pos $pos\n" );
$this->shutdownPositions[$masterName] = $pos;
if ( $pos ) {
$this->logger->debug( __METHOD__ . ": LB for '$masterName' has pos $pos\n" );
$this->shutdownPositions[$masterName] = $pos;