Setting up LLAP

Using Ambari, you can set up basic, low-latency analytical processing (LLAP) by accepting the default llap queue, changing some YARN queue properties, and adding a HiveServer property to hive-site.xml.

You have installed Ambari 2.7.x or later.
You added and started YARN, Tez, and dependencies that Ambari prompts you to add.
You added, started, and can run conventional queries from the Hive service.
If enabled, you disabled maintenance mode for the Hive service and target host for HiveServer Interactive (HSI); otherwise, enabling LLAP fails to install HSI. Alternatively, you need to install HiveServer Interactive on the Ambari server as follows:
```
curl -u admin:<password> -H "X-Requested-By:ambari" -i -X POST http://host:8080/api/v1/clusters/<cluster_name>/hosts/<host_name>/host_components/HIVE_SERVER_INTERACTIVE
```