How to connect to Cloudera Impala from the Denodo Platform

Applies to: Denodo 7.0
Last modified on: 08 Apr 2019
Tags: Cloud Big Data JDBC data sources

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Goal

This document describes how to access Cloudera from the Denodo Platform.

Content

Cloudera Impala is a SQL engine provided with the Cloudera Hadoop distribution that provides fast interactive SQL queries directly on Hadoop data stored in HDFS or HBase. Impala provides a JDBC driver which Denodo can readily use to connect.

Connecting to Cloudera from Denodo

  • From the Virtual DataPort Administration tool, create a new JDBC data source by selecting “File > New > Data source > JDBC”. This will open a connection wizard to create a data source with a JDBC driver.

  • To create a connection, fill all the required fields:
  • Name: ds_impalacloudera
  • Database adapter: Impala 2.3
  • Database URI: Use a connection string in the form of: jdbc:impala://<server>:<port>/<schema>

For example: jdbc:impala://localhost:21000/database

  • Username: Enter the username to connect to Impala.
  • Password: Enter the appropriate password.

  • Once the details are filled, click on “Test Connection” and if the connection is successful, click on “Save”.

  • Once the data source is created, create base views for that particular source. In order to do that, click on the "Create Base View" option.

  • The Tool will then display a tree with the schemas of the database. Click on any schema to inspect its tables and their fields.  To search a view or a schema, type its name in the “search” box located at the top. The list will only show the elements whose name contains the text you entered.  

  • To incorporate some of the tables into the Denodo virtual schema, you have to check the box near the tables or views you want to import and then click “Create selected”.

  • When the importing process is finished, the new views are displayed.

  • Now, the base views are ready for the execution and to be combined with the rest of the sources.

References

Virtual DataPort Administration Guide: JDBC Sources

Virtual DataPort Administration Guide: Impala

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