Custom Transformation with Azure Data Lake

Calibo Accelerate supports Databricks custom transformation using Azure Data ake as source and as target.

To create a Databricks custom transformation job

1. Sign in to Calibo Accelerate and navigate to Products.

2. Select a product and feature. Click the Develop stage of the feature.

3. Click Data Pipeline Studio.

4. Create a pipeline with the following stages and add the required technologies:

   

5. Configure the source and target nodes.

6. Click the data transformation node and click Create Custom Job.

   

7. Complete the following steps to create the Databricks custom transformation job:

   Job Name

   • Job Name - Provide a name for the custom transformation job.

   • Node Rerun Attempts - Specify the number of times the job is rerun in case of failure. The default setting is done at the pipeline level.

   • Fault tolerance - Select the behaviour of the pipeline upon failure of a node. The options are:

     • Default - Subsequent nodes should be placed in a pending state, and the overall pipeline should show a failed status.

     • Skip on Failure - The descendant nodes should stop and skip execution.

     • Proceed on Failure - The descendant nodes should continue their normal operation on failure.

   Repository

   In this step you create a repository to store the custom code for your transformation job. Before creating a repository you are prompted to create a branch template if you haven't configured one already.

   

   1. Click Configure Branch Template to create a branch template or click Proceed if you do not want to create a branch template.

      

      Note:

      If you do not configure a branch template, only the master branch is created in code repository.

   2. In the Repository step, do one of the following:

      1. Turn on the toggle for Use Existing Repository, provide a title and select a repository from the dropdown list.

      2. To create a new repository, provide the following information:

         

         • Repository Name - A repository name is provided in the default format. The repository name is populated in the following format: Technology Name - Product Name. For example if the technology being used is Databricks and the product name is ABC, then the repository name is Databricks-ABC. You can edit this name to create a custom name for the repository.

           

           Note:

           You can edit the repository name when you use the instance for the first time. Once the repository name is set, you cannot change it thereafter.

         • Group - Select a group to which you want to add this repository. Groups help you to organize, manage, and share the repositories for the product.

         • Visibility - Select the type of visibility that the repository must have. Choose from Public or Private.

           

           Note:

           The Group and Visibility fields are only visible if you configure GitLab as a source code repository.

         • Click Create Repository. Once the repository is created, the repository path is displayed.

         • Select Source Code Branch from the dropdown list.

      Click Next.

   Additional Parameters

   In this step, you can provide additional parameters that are used as source payload parameters.

   Example 1: If you have an API that returns data related to a specific product or customer, the product name or customer ID could be passed as additional parameters, ensuring the job fetches the relevant data for that specific product or customer.

   Example 2: If you're pulling product data from an API, an additional parameter like product_name="Product A" can be passed to the source system as part of the payload to ensure only data related to "Product A" is fetched.

   Example 3: If you're fetching transaction data, the additional parameters start_date="2025-01-01" and end_date="2025-01-31" can be used in the source system's payload to only retrieve transactions within that date range.

   You can either provide system-defined parameters or custom parameters to the transformation job.

   • System Defined Parameters - Uncheck the parameters that you do not want to include with the transformation job and click Next.

   • Custom Parameters - You can either add custom parameters manually or you can import them from a JSON file.

     • Add Manually - Provide a key and value. Mark the parameter as sensitive or mandatory depending on your requirement.

     • Import from JSON - You can download a template and create a JSON file with the required parameters or upload a JSON file directly.

   Click Next.

   Cluster Configuration

   You can select an all-purpose cluster An all-purpose cluster can be used by multiple users to run ETL jobs, data analytics jobs and so on. Multiple users can use an all-purpose cluster and it can be manually terminated and restarted. or a job cluster A job cluster is very specific to the job and is terminated once the job is complete. to run the configured job. Since you are creating a custom transformation job, you may require certain library versions for successfully running the transformation job. To update the library versions, see Updating Cluster Libraries for Databricks

   In case your Databricks cluster is not created through the Calibo Accelerate platform and you want to update custom environment variables, refer to the following:

   How to update custom environment variables for a Databricks cluster that is not created through the Calibo Accelerate platform

   All Purpose Clusters

   Cluster - Select an all-purpose cluster from the dropdown list, that you want to use for the data transformation job.

   Job Cluster

   Cluster Details	Description
   Choose Cluster	Provide a name for the job cluster that you want to create.
   Job Configuration Name	Provide a name for the job cluster configuration.
   Databricks Runtime Version	Select the appropriate Databricks version.
   Worker Type	Select the worker type for the job cluster.
   Workers	Enter the number of workers to be used for running the job in the job cluster. You can either have a fixed number of workers or you can choose autoscaling.
   Enable Autoscaling	Autoscaling helps in scaling up or down the number of workers within the range specified by you. This helps in reallocating workers to a job during its compute-intensive phase. Once the compute requirement reduces the excess number of workers are removed. This helps control your resource costs.
   Cloud Infrastructure Details
   First on Demand	Lets you pay for the compute capacity by the second.
   Availability	Select from the following options: Spot On-demand Spot with fallback
   Zone	Select a zone from the available options.
   Instance Profile ARN	Provide an instance profile ARN that can access the target S3 bucket.
   EBS Volume Type	The type of EBS volume that is launched with this cluster.
   EBS Volume Count	The number of volumes launched for each instance of the cluster.
   EBS Volume Size	The size of the EBS volume to be used for the cluster.
   Additional Details
   Spark Config	To fine tune Spark jobs, provide custom Spark configuration properties in key value pairs.
   Environment Variables	Configure custom environment variables that you can use in init scripts.
   Logging Path (DBFS Only)	Provide the logging path to deliver the logs for the Spark jobs.
   Init Scripts	Provide the init or initialization scripts that run during the start up of each cluster.

8. After you create the job, click the job name to navigate to Databricks Notebook.

To add custom code to your transformation job

After you have created the custom transformation job, click the Databricks Notebook icon.

This navigates you to the custom transformation job in the Databricks UI. Review the sample code and replace it with your custom code.

To run a custom transformation job

You can run the custom transformation job in one of the following ways:

• Navigate to Calibo Accelerate and click the Databricks node. Click Start to initiate the job run.

  

• Publish the pipeline and then click Run Pipeline.

Recommended Topics

What's next? Databricks Custom Transformation Job