Zoomdata Version

Connecting to Apache Drill

Zoomdata's Apache Drill connector lets you access the data available in this open-source SQL query engine for visualization and exploration within the Zoomdata Client. Zoomdata supports Apache Drill versions 1.2.0 through 1.5.0 .

PREREQUISITES

Before you can establish a connection from Zoomdata to Apache Drill, an Apache Drill connector server needs to be installed, configured and enabled first by the Zoomdata Account Administrator.

Starting with version 2.3, Zoomdata's architecture has been enhanced to enable the deployment of new connectors as standalone components running in their own process space. To learn more and access the setup instructions, refer to the article Configuring a New Connector Manually .

Once the Apache Drill connector server has been installed and enabled in the Zoomdata environment, return to this article for step-by-step guidance to establishing a connection.

The table below lists information on the features that are supported by Apache Drill:

Supports Distinct Count? Yes
Supports Live Mode/ Playback? No
SparkIt Capable? Yes
Supports Group-by Time? Yes
Supports Multi Group-by Charts? Yes
Supports Histogram? Yes
Supports Box Plot? Yes
Custom SQL Capable? Yes
Supports Last Value? No
Supports Partition? Yes
Supports Column Aggregations? Yes

CONFIGURING THE CONNECTION

For details about what is provided on each page of the connection process, review the article Source Connection Workflow . Depending on your needs, you can either follow the steps in order from start to finish or jump to a specific section in the connection process:

Start

  1. Log into Zoomdata.
  2. Click the Sources menu option.


Figure 1

  1. Click the Apache Drill connector icon.

General Page

  1. Specify the name of your source and add a description (if desired).


Figure 2

  1. Click Next to continue to the next setup page.

Connection Page

This page defines the connection source for Zoomdata to be able to access the data source. If this is the first time setting up a connection, then you need to input the necessary credentials. If a validated connection already exists, you are given the option to use it.

  1. To create a new connection, select the Input New Credentials option.
  2. Enter a unique name for the connection (to help distinguish between other connections in this Zoomdata account).
  3. Specify the JDBC URL.
    If authentication has been set up, provide the User Name and Password.
  4. Click Validate .
    If successfully validated, the connection is saved.


Figure 3

  1. Click Next to continue to the next setup page.

Tables Page

The Tables page lets you select the schema and table to connect with and provides a preview of the selected table. In addition, caching options and toggling the availability of the fields can be done on this page. Note that Apache Drill supports three types of data queries: (a) by folders and files, (b) by views with custom schema definition, and (c) using Hive metastore for getting schema. Zoomdata supports only two last options (b and c).

  1. Select the schema, if available, and then select the desired table to connect to Zoomdata.


Figure 4

  1. Create a Custom SQL query, if needed.
Zoomdata wraps your SQL query into a SELECT statement. If specific statements inside the wrapped query are not supported by your data source, the query will not be executed.
  1. Toggle the caching options (SparkIt and Caching), as needed.
Spark It capability is planned for deprecation in a future release.
  1. Toggle the availability of the fields, as needed.
  2. Click Next to continue.

Fields Page

The Fields page lets you (1) configure attribute options, (2) create custom labels for the fields in your data source (that will be displayed in the charts), (3) manage the Volume metric, and (4) work with Calculations.

  1. Determine whether the field should be visible or not to the user.
  2. Create unique label names, as needed, for each Label field.
When you create a data source, the specific number of distinct values for the attribute fields are saved in Zoomdata depending on the data sample from your data set. You can filter the data on your chart by these values. While editing a data source, if you want to use all distinct values in the filter (that is from whole data source), click the Refresh button in the Statistics column.
  1. For the Type column, you have the option to edit the field type (although usually you won't need to do this).
  2. Configure the partition settings. For the partitioned fields you can select one of the following options:
  • No
  • Date - this option is available for the Time field type. If you select this option, the list of the partitioned columns will be displayed in the Configure column.
  1. For the Configure column, numeric and time-based fields may be edited:
    • Numeric types including Money, Number and Integer - ability to select a default aggregation function
    • Time fields - ability to define the default time pattern and granularity; if the time field provides granularities of hour, minute and second, then a time zone label may be applied
  2. Select fields for Distinct Counts as needed.
  3. Refresh the connection to a particular field, as desired.
  4. Configure Filter Display settings for fields.
  5. Edit the Volume Metric settings, as needed.
  6. Work with Calculations, if available and as needed.
    If you are setting up a new connection, the Calculations section will not be available until after the connection is saved.
  7. Click Next to continue.


Figure 5

Refresh Page

The Refresh page lets you schedule asynchronous jobs to update the source metadata. For guidance to set up a refresh schedule, refer to the article Using the Zoomdata Scheduler .

Charts Page

On the Charts page, you can:

  1. Edit Global Default Settings
  2. Select the Standard and, if available, Custom chart styles to be used with the data source
  3. Set default parameters (group, sub-group, colors, sorting, and so on) for each chart style


Figure 6

Learn more about how to customize a chart .

Click Finish to save your changes. Once your data connection has been established, it is listed under the My Data Sources section of the page.