Selecting the Spark mode

Depending on the Spark cluster to be used, select a Spark mode for your Job.

The Spark documentation provides an exhaustive list of Spark properties and their default values at Spark Configuration. A Spark Job designed in Talend Studio uses this default configuration except for the properties you explicitly defined in the Spark Configuration tab or the components used in your Job.

Procedure

Click Run to open its view and then click the Spark Configuration tab to display its view for configuring the Spark connection.
Select the Use local mode check box to test your Job locally.

In the local mode, Talend Studio builds the Spark environment in itself on the fly in order to run the Job in. Each processor of the local machine is used as a Spark worker to perform the computations.

In this mode, your local file system is used; therefore, deactivate the configuration components such as tS3Configuration or tAzureFSConfiguration that provides connection information to a remote file system, if you have placed these components in your Job.

You can launch your Job without any further configuration.
Clear the Use local mode check box to display the list of the available Hadoop distributions and from this list, select the distribution corresponding to your Spark cluster to be used.
This distribution could be:
- Databricks
- Amazon EMR
  For this distribution, Talend supports:
  
  Yarn client
  
  Yarn cluster
  
  Information noteImportant: Delta Lake is not supported on Amazon EMR.
- Cloudera
  For this distribution, Talend supports:
  
  Standalone
  
  Yarn client
  
  Yarn cluster
- Cloudera Altus
  For this distribution, Talend supports:
  
  Yarn cluster
  
  Your Altus cluster should run on the following Cloud providers:
  
  Azure
  
  The support for Altus on Azure is a technical preview feature.
  
  AWS
As a Job relies on Avro to move data among its components, it is recommended to set your cluster to use Kryo to handle the Avro types. This not only helps avoid this Avro known issue but also brings inherent performance gains. The Spark property to be set in your cluster is:
```
spark.serializer org.apache.spark.serializer.KryoSerializer
```
If you cannot find the distribution corresponding to yours from this drop-down list, this means the distribution you want to connect to is not officially supported by Talend . In this situation, you can select Custom, then select the Spark version of the cluster to be connected and click the [+] button to display the dialog box in which you can alternatively:
1. Select Import from existing version to import an officially supported distribution as base and then add other required jar files which the base distribution does not provide.
2. Select Import from zip to import the configuration zip for the custom distribution to be used. This zip file should contain the libraries of the different Hadoop/Spark elements and the index file of these libraries.
  
  Note that custom versions are not officially supported by Talend. Talend and its community provide you with the opportunity to connect to custom versions from Talend Studio but cannot guarantee that the configuration of whichever version you choose will be easy. As such, you should only attempt to set up such a connection if you have sufficient Hadoop and Spark experience to handle any issues on your own.
For a step-by-step example about how to connect to a custom distribution and share this connection, see Hortonworks.

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