Impala Connector

Options

Connection settings

Database Dialect

Choose the registered database dialect here.

Driver Name

Choose the registered database driver here. Additional drivers can be registered via KNIME's preference page "KNIME -> Databases". For more details on how to register a new driver see the database documentation.
The node includes the Apache Hive driver, which is compatible with Impala. Proprietary drivers are also supported, but need to be registered first, such as the Impala JDBC connector provided by Cloudera.

Hostname

The hostname (or IP address) of a Impala server. The corresponding driver URL template variable is host.

Port

The port on which the Impala server is listening. The default port is 21,050. The corresponding driver URL template variable is port.

Database name

The name of the database you want to connect to. The corresponding driver URL template variable is database.

None

If checked, then authentication is not required.

Credentials

If checked, the credentials (user and password) are used as defined in the workflow. The credential name links to the specified user and password.

Username

Your username for the database.

Username & password

Your username and password for the database. Note that the password is stored using weak encryption as part the workflow .

Kerberos

Uses an existing Kerberos ticket for authentication. Note that this requires additional parameters to be specified in the JDBC Parameters tab (see below).

JDBC Parameters

This tab allows you to define driver-specific parameters for the JDBC connection. The value of a parameter can be a constant, variable, credential user, credential password or KNIME URL. For more information about the parameters supported by the included Apache Hive driver, please consult the Hive documentation. When using a proprietary Hive driver, please consult the vendor documentation, e.g. Cloudera JDBC Driver for Apache Impala Install Guide.

Kerberos

The following parameters are required to use Kerberos authentication.

Apache Hive Driver (default KNIME driver)

• kerberosAuthType: fromSubject
• principal: hive/<server>@<REALM> (replace <server> with the fully qualified hostname and <REALM> with the Kerberos realm of the Hive service).

Proprietary Impala Drivers (provided by Amazon/Hortonworks/Cloudera)

• AuthMech: 1
• KrbHostFQDN: full qualified hostname of Impala
• KrbRealm: REALM (Kerberos realm of Impala)
• KrbServiceName: impala (Kerberos service name of Impala)

SSL/TLS

The following parameters are required to use SSL/TLS.

Apache Hive Driver (default KNIME driver)

• ssl: true
• sslTrustStore: full path of truststore
• trustStorePassword: password to access the truststore

Proprietary Impala Drivers (provided by Amazon/Hortonworks/Cloudera)

• SSL: 1
• SSLTrustStore: full path of truststore
• SSLTrustStorePwd: password to access the truststore

Advanced

This tab allows you to define KNIME framework properties such as connection handling, advanced SQL dialect settings or logging options.

Input Type Mapping

This tab allows you to define rules to map from database types to KNIME types.

Mapping by Name

Columns that match the given name (or regular expression) and database type will be mapped to the specified KNIME type.

Mapping by Type

Columns that match the given database type will be mapped to the specified KNIME type.

Output Type Mapping

This tab allows you to define rules to map from KNIME types to database types.

Mapping by Name

Columns that match the given name (or regular expression) and KNIME type will be mapped to the specified database type.

Mapping by Type

Columns that match the given KNIME type will be mapped to the specified database type.

Views

This node has no views

Workflows

• 01_Flight_Delay_Statistics_ImpalaKNIME Hub
• ConnectorsKNIME Hub
• m_100_db_create_bigdata_tablesKNIME Hub
• m_120_db_access_bigdata_tablesKNIME Hub

Links

• No links available

Developers