To begin using Cloudera Impala, start at least one instance of the Impala statestore, at least one instance of the Impala catalog service, and then start Impala on one or more DataNodes. If you installed Impala with Cloudera Manager, use Cloudera Manager to start and stop services. To start the Impala state store and Impala using means other than Cloudera Manager, you can either use init scripts or you can start the state store and Impala directly.
Impala is designed to run in distributed mode using the Impala state store. While the Impala state store helps ensure the best performance, in the event the state store becomes unavailable, Impala continues to function. Start the Impala state store and then start impalad instances. You can modify the values the init scripts use when starting the state store 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:
$ sudo service impala-catalog start
Start the Impala service on each data node using a command similar to the following:
$ sudo service impala-server start
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