How to monitor the execution status of queries in Impala?

In Impala, there are several ways to monitor the execution status of queries.

1. Impala UI: Impala offers a web interface that allows users to monitor query execution by accessing it through a browser. In the Impala UI, users can view active queries, completed queries, detailed information about queries, and more.
2. When running a query in Impala Shell, you can use the “PROFILE” command to view detailed execution information. For example, after a query is completed, you can execute the “PROFILE” command to see the execution plan, execution time, number of rows scanned, and other information.
3. Impala Daemon logs: Impala Daemon will record information about query execution and performance metrics in log files. You can check the Impala Daemon’s log files for more detailed information on query execution.
4. You can use Impala Query Profile to view detailed execution plans, scan data row numbers, execution times, and other information of a query. By using the “SET PROFILE” command, you can enable the Query Profile feature, and then view the query’s Profile information in Impala UI or Impala Shell.

By using the above methods, you can monitor the execution status of queries in Impala and make timely adjustments to queries or optimize table structures in order to enhance query performance.