Database Reference
In-Depth Information
Chapter 2. The Impala Shell Commands
and Interface
Once impala is installed, configured, and ready to start, the next step is to know how
to interact with Impala in different ways for various reasons. This chapter explains the
various command options to interact with Impala, mainly using command-line refer-
ences. In the previous chapter, we also discussed various ways to install Impala.
In the previous chapter, we understood that
impalad
is the Impala daemon, which
runs on every node in the cluster and receives queries submitted through various in-
terfaces such as third-party applications using the ODBC or JDBC connectivity, Web
interface, or API, and finally the Impala shell. In general, the impala-shell is a process
that runs in a node and works as a gateway to connect to
impalad
through commands.
The Impala shell is used to submit various commands that can set up databases and
tables, insert data into tables, and finally submit queries on stored data.
Using Cloudera Manager for Impala
Before we jump into Impala shell, let's first try using Cloudera Manager to check the
status of Impala. By default, Cloudera Manager configures to run on port 7180. In
your cluster where you have installed Impala using Cloudera Manager, open Cloudera
Manager in your favorite web browser and browse through all services to check the
status of Impala.
If Impala daemon (
impalad
) and Impala statestore (
statestored
) are installed correctly
and running, you will see them listed as shown in the following screenshot:
