Below are the step by step instruction on how to upgrade Apache Spark to V3.4.

Step 1:

Go to AzSynapseSparkPool Powershell from the Azure Portal

Step: 2:

Upgrade Apache Spark pool using Update-AzSynapseSparkPool powershell cmdlet as shown below.

Check the version of the Apache Spark:

get-AzSynapsesparkpool -WorkspaceName <Synapseworkspacename>

Update the version of the Spark:

update-AzSynapseSparkPool -WorkspaceName <Synapseworkspacename> -Name <SparkPoolName> -sparkversion 3.4