Transform data in Azure Data Factory and Azure Synapse Analytics

APPLIES TO: Azure Data Factory Azure Synapse Analytics

Overview

This article explains data transformation activities in Azure Data Factory and Synapse pipelines that you can use to transform and process your raw data into predictions and insights at scale. A transformation activity executes in a computing environment such as Azure Databricks or Azure HDInsight. It provides links to articles with detailed information on each transformation activity.

The service supports the following data transformation activities that can be added to pipelines either individually or chained with another activity.

Transform natively in Azure Data Factory and Azure Synapse Analytics with data flows

Mapping data flows

Mapping data flows are visually designed data transformations in Azure Data Factory and Azure Synapse. Data flows allow data engineers to develop graphical data transformation logic without writing code. The resulting data flows are executed as activities within pipelines that use scaled-out Spark clusters. Data flow activities can be operationalized via existing scheduling, control, flow, and monitoring capabilities within the service. For more information, see mapping data flows.

Data wrangling

Power Query in Azure Data Factory enables cloud-scale data wrangling, which allows you to do code-free data preparation at cloud scale iteratively. Data wrangling integrates with Power Query Online and makes Power Query M functions available for data wrangling at cloud scale via spark execution. For more information, see data wrangling in Azure Data Factory.

External transformations

Optionally, you can hand-code transformations and manage the external compute environment yourself.

HDInsight Hive activity

The HDInsight Hive activity in a pipeline executes Hive queries on your own or on-demand Windows/Linux-based HDInsight cluster. See Hive activity article for details about this activity.

HDInsight Pig activity

The HDInsight Pig activity in a pipeline executes Pig queries on your own or on-demand Windows/Linux-based HDInsight cluster. See Pig activity article for details about this activity.

HDInsight MapReduce activity

The HDInsight MapReduce activity in a pipeline executes MapReduce programs on your own or on-demand Windows/Linux-based HDInsight cluster. See MapReduce activity article for details about this activity.

HDInsight Streaming activity

The HDInsight Streaming activity in a pipeline executes Hadoop Streaming programs on your own or on-demand Windows/Linux-based HDInsight cluster. See HDInsight Streaming activity for details about this activity.

HDInsight Spark activity

The HDInsight Spark activity in a pipeline executes Spark programs on your own HDInsight cluster. For details, see Invoke Spark programs with Azure Data Factory or Azure Synapse Analytics.

Stored procedure activity

You can use the SQL Server Stored Procedure activity in a Data Factory pipeline to invoke a stored procedure in one of the following data stores: Azure SQL Database, Azure Synapse Analytics, SQL Server Database in your enterprise or an Azure VM. See Stored Procedure activity article for details.

Databricks Notebook activity

The Azure Databricks Notebook Activity in a pipeline runs a Databricks notebook in your Azure Databricks workspace. Azure Databricks is a managed platform for running Apache Spark. See Transform data by running a Databricks notebook.

Databricks Jar activity

The Azure Databricks Jar Activity in a pipeline runs a Spark Jar in your Azure Databricks cluster. Azure Databricks is a managed platform for running Apache Spark. See Transform data by running a Jar activity in Azure Databricks.

Databricks Python activity

The Azure Databricks Python Activity in a pipeline runs a Python file in your Azure Databricks cluster. Azure Databricks is a managed platform for running Apache Spark. See Transform data by running a Python activity in Azure Databricks.

Custom activity

If you need to transform data in a way that is not supported by Data Factory, you can create a custom activity with your own data processing logic and use the activity in the pipeline. You can configure the custom .NET activity to run using either an Azure Batch service or an Azure HDInsight cluster. See Use custom activities article for details.

You can create a custom activity to run R scripts on your HDInsight cluster with R installed. See Run R Script using Azure Data Factory and Synapse pipelines.

Compute environments

You create a linked service for the compute environment and then use the linked service when defining a transformation activity. There are two supported types of compute environments.

• On-Demand: In this case, the computing environment is fully managed by the service. It is automatically created by the service before a job is submitted to process data and removed when the job is completed. You can configure and control granular settings of the on-demand compute environment for job execution, cluster management, and bootstrapping actions.
• Bring Your Own: In this case, you can register your own computing environment (for example HDInsight cluster) as a linked service. The computing environment is managed by you and the service uses it to execute the activities.

See Compute Linked Services article to learn about supported compute services.

Related content

See the following tutorial for an example of using a transformation activity: Tutorial: transform data using Spark