presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/AccumuloModule.java/ConnectorProvider/get
class ConnectorProvider:        @Override
        public Connector get()
        {
            try {
                Instance inst = new ZooKeeperInstance(instance, zooKeepers);
                Connector connector = inst.getConnector(username, new PasswordToken(password.getBytes(UTF_8)));
                LOG.info("Connection to instance %s at %s established, user %s", instance, zooKeepers, username);
                return connector;
            }
            catch (AccumuloException | AccumuloSecurityException e) {
                throw new PrestoException(UNEXPECTED_ACCUMULO_ERROR, "Failed to get connector to Accumulo", e);
            }
        }