## **2. Prerequisites**

- Install Hortonworks Distribution using this [guide.](https://docs.hortonworks.com/HDPDocuments/Ambari-2.7.1.0/bk_ambari-installation/content/ch_Installing_Ambari.html)

        if ( this._domains != null )
            return this._domains.map;
        try {
            String authDomain = tf.getCredentials().getUserDomain();
            // otherwise you end up with a wrong server name for kerberos
            // seems to be correct according to
            // https://lists.samba.org/archive/samba-technical/2009-August/066486.html
            // UniAddress addr = UniAddress.getByName(authDomain, true, tf);

## ¿Tienes prisa?

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

Si estás utilizando libraries de terceros que te dicen que las llames con `await`, del tipo:

```Python
results = await some_library()
```

Entonces declara tus *path operation functions* con `async def` de la siguiente manera:

```Python hl_lines="2"

javax.imageio.plugins.jpeg,\ javax.imageio.spi,\ javax.imageio.stream,\ javax.net,\ javax.net.ssl,\ javax.print,\ javax.print.attribute,\ javax.print.attribute.standard,\ javax.print.event,\ javax.security.auth,\ javax.security.auth.callback,\ javax.security.auth.kerberos,\ javax.security.auth.login,\ javax.security.auth.spi,\ javax.security.auth.x500,\ javax.security.cert,\ javax.sql,\ javax.transaction.xa,\ javax.xml.parsers,\ javax.xml.transform,\ javax.xml.transform.dom,\ javax.xml.transform.sax,\ javax.xml.transform.stream,\...