public function getConnection()
{
    $debug = 'No Master/Slave connection used' . PHP_EOL;

    if ($this->isMasterSlaveConnection($this->connection)) {
        /** @var $connection MasterSlaveConnection */
        $connection = $this->connection;
        $debugBacktrace = debug_backtrace();
        $count = count($debugBacktrace) - 1; //skip require_once

        $debug = 'Used Connection: ';
        $debug .= $connection->isConnectedToMaster() ? 'master' : 'slave';
        $debug .= PHP_EOL;

         // 0 is always this method.
         for ($i = 1; $i < $count; $i++) {
             $debug .= $debugBacktrace[$i]['class'] . ' :: ' . $debugBacktrace[$i]['function'] . PHP_EOL;
         }
    }

    $logger = getLogger();
    $logger->error($debug);

    return parent::getConnection();
}