Debugging Impala Virtual Warehouses using Web UIs

You can use the Catalog Web UI, Coordinator Web UI, and the StateStore Web UI to debug Impala Virtual Warehouses in Cloudera Data Warehouse (CDW).

The Impala daemons (impalad, statestored, and catalogd) debug Web UIs, which can be used in CDP Runtime by using Cloudera Manager, is also available in the CDW service. In CDW service, the following Web UIs are provided:

Impala Catalog Web UI
This UI provides the same type of information as the Catalog Server Web UI in Cloudera Manager. It includes information about the objects managed by the Impala Virtual Warehouse. For more information about this debug Web UI, see Debug Web UI for Catalog Server.
Impala Coordinator Web UI
This UI provides the same type of information as the Impala Daemon Web UI in Cloudera Manager. It includes information about configuration settings, running and completed queries, and associated performance and resource usage for queries. For information about this debug Web UI, see Debug Web UI for Impala Daemon.
Impala StateStore Web UI
This UI provides the same type of information as the StateStore Web UI in Cloudera Manager. It includes information about memory usage, configuration settings, and ongoing health checks that are performed by the Impala statestored daemon. For information about this debug Web UI, see Debug Web UI for StateStore.
Impala Autoscaler Web UI
This UI gives you insight into autoscaler operations (regular as well as workload-aware autoscaling), accessing log messages, and resetting the log level. The autoscaler Web UI includes information about the queries queued and running, executor groups, suspended calls, scale up/down calls, the autoscaler config, and the autoscaler logs.

Required role: EnvironmentAdmin

Make sure that you note your CDP workload user name and have set a password for it in the User Management module of Management Console. You need to use your workload user name and its associated password to log into the debug Web UIs. For more information, see Setting the workload password in the Management Console documentation set.

In the CDW UI on the Overview page, locate the Impala Virtual Warehouse for which you want to view the debug UIs, and select > Edit.
The Virtual Warehouse Details page is displayed.
In the Virtual Warehouse Details page, select the Web UI tab. The list of debug Web UI links are displayed as shown in the following image:
Click a Web UI link corresponding to an Impala daemon that you want to debug.
You are prompted to enter your workload user name and password.

After you are authenticated, you can view the debug Web UI and use the information to help you troubleshoot issues with your Impala Virtual Warehouse.