Impala Connector

Options

Hostname

The hostname (or IP address) of the Impala server.

Port

The port on which the Impala server is listening. The default port is 21,050.

Database name

The name of the database you want to connect to.

Parameter

Optional connection parameter such as ssl or authentication options.

For Cloudera driver specific settings see the Cloudera JDBC Driver for Impala Install Guide.

Use credentials

Selection this option if you want to provide authentication data via workflow credentials. Then select the desired credential name in the list below.

Use username & password

Provide a username and a password for authentication. The password may be optional if the server is configured accordingly.

Use Kerberos

Uses an existing Kerberos ticket for authentication. When connecting to HiveServer2 the principal of the HiveServer2 user needs to be added in the Parameter field e.g. principal=impala/impala_host@YOUR-REALM.COM The principal must be the same user principal you used when starting Impala. For details see the Impala documentation or the Cloudera JDBC Driver for Impala Install Guide.

Timezone correction

Select the TimeZone to convert the date, time or timestamp field into. The current implementation can't represent time zones. In order to support persisting those fields into a database, the time values can be changed according to the selected time zone, which is used as the offset (including the daylight saving time) for the original values:

• No correction (use UTC) is used for workflows (created before 2.8) and doesn't apply any correction,
• Use local timezone uses the local time zone offset to correct the date field before reading or writing, and
• Use selected timezone allows selecting the time zone to covert the date values into.

Validate connection on close

Check this option if you want to validate the connection when closing the dialog.

Retrieve metadata in configure

This option controls subsequent nodes. Usually when a database node is configured it retrieves the metadata of the current table or query from the database for usage in subsequent nodes. If metadata retrieval takes quite some time it will slow down workflow configuration and execution noticeably, especially since metadata is retrieved in both configure and execute. In such cases it's better to switch this option off and only retrieve metadata during execute.

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