Database Reference
In-Depth Information
Launching Impala shell
Once ready, you can launch the Impala shell just by typing
impala-shell
in the
console window. It can run on any machine in your cluster as long as it has connec-
tion availability to Impala daemon. Impala-shell can also run on the same machine
where
impalad
is running or on a DataNode as well You can launch Impala shell by
just executing the following command in command prompt:
$impala-shell
After execution, Impala shell's command window will look like the following screen-
shot:
The previous impala-shell is connected to impalad, running on the same machine at
localhost and port
21000
, where impala-shell is also running. Connecting the impala-
shell using the hostname as
localhost
when impalad is also running on the same
node is also connected.
If the Impala shell cannot connect to the default server, you may see an
Error con-
necting: <class 'thrift.transport.TTransport.TTransportException'>, Could not
connect to <hostname>:<port>
error message.
To resolve this problem, please make sure that the Impala server is running and you
can connect to that server from the machine where you are trying to run impala-shell.
When the impala-shell session is started, queries can be submitted only when impala-
shell is connected to an instance of impala daemon.
