Connecting to Cloudera Impala

Steps

Please follow the steps below to connect to the Cloudera Impala data source.

1. On the Data Connection page, click "New Data Connection" in the upper right corner.

2. In the data source types, select the Cloudera Impala data source.

3. Fill in the required parameters for the data source connection as prompted.

   Connection Configuration Information Description

   Field	Description
   Name	The name of the connection. Required and unique within the user
   Host Address	The address of the database. If the URL field is filled, the value in the URL takes precedence
   Port	The port of the database. If the URL field is filled, the value in the URL takes precedence
   Username	The username for the database
   Password	The password for the database
   Database	The name of the database
   Schema	The schema of the database
   Max Connections	Maximum number of connections in the connection pool
   Encoding	Encoding settings for the database connection
   Prefer using database comment as dataset title	Whether to display the table name or the table comment as the title
   Hadoop Authentication Method	Hadoop authentication method. "simple" is simple authentication and requires no extra info; "Kerberos" requires additional information
   realmA	Required when Hadoop authentication method is Kerberos
   kdcA	Required when Hadoop authentication method is Kerberos
   realmB	Required when Hadoop authentication method is Kerberos
   kdcB	Required when Hadoop authentication method is Kerberos
   server principal	Required when Hadoop authentication method is Kerberos
   URL	The JDBC URL of the database
   Additional JDBC Parameters	Additional JDBC parameters. It is recommended to use the URL to write the complete URL. This parameter is only appended to the auto-generated JDBC URL
   Hierarchical loading of schema and tables	Default is off. When enabled, schemas and tables are loaded hierarchically. Only schemas are loaded during connection; you need to click the schema to load the tables under it
   Query Timeout (seconds)	Default is 600. If the data volume is large, you can increase the timeout appropriately
   Allow Write Operations	Indicates that this connection can be selected as an output connection in Data Integration and Batch Sync. You must have write permission to the database and pass verification before configuring this parameter.
   Support uploading files to specified path	Indicates the database name where the table generated when creating a local file dataset is stored. You must have write permission to the database and pass verification before configuring this parameter.
   Show only tables under specified database/schema	When this option is selected and the database field is not empty, only tables under that DB are displayed

4. After filling in the parameters, click the Validate button to get the validation result (this checks the connectivity between HENGSHI SENSE and the configured data connection; you cannot add the connection if validation fails).

5. After validation passes, Allow Write Operations and Support uploading files to specified path will be enabled and can be optionally turned on.

6. Click Execute Preset Code to pop up the preset code for this data source, then click the execute button.

7. Click the Add button to add the Cloudera Impala connection.

Please note

1. Parameters marked with * are required; others are optional.
2. When connecting to a data source, you must execute the preset code. Failure to do so may result in certain functions being unavailable during data analysis. In addition, when upgrading from a version prior to 4.4 to 4.4, you need to execute the preset code for existing data connections in the system.

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Supported Versions

2.5, 2.9, 2.10, 3.2 and later versions

Data Connection Preview Support

Supports all tables that can be listed by show tables.

SQL Dataset Support for SQL

All SELECT-related features are supported. The SELECT SQL statement must comply with the Impala SQL syntax specification.

Unsupported Field Types

The following data types in Impala cannot be processed correctly:

• ARRAY
• MAP
• STRUCT