state store starting services services To activate Impala if it is installed but not yet started:

1. Set any necessary configuration options for the Impala services. See for details.
2. Start one instance of the Impala statestore. The statestore helps Impala to distribute work efficiently, and to continue running in the event of availability problems for other Impala nodes. If the statestore becomes unavailable, Impala continues to function.
3. Start one instance of the Impala catalog service.
4. Start the main Impala service on one or more DataNodes, ideally on all DataNodes to maximize local processing and avoid network traffic due to remote reads.

Once Impala is running, you can conduct interactive experiments using the instructions in and try .

To start the Impala state store and Impala from the command line or a script, you can either use the service command or you can start the daemons directly through the impalad, statestored, and catalogd executables.

Start the Impala statestore and then start impalad instances. You can modify the values the service initialization scripts use when starting the statestore and Impala by editing /etc/default/impala.

Start the statestore service using a command similar to the following:

$ sudo service impala-state-store start

Start the catalog service using a command similar to the following:

Start the Impala service on each DataNode using a command similar to the following:

$ sudo service impala-server start