Create Polybase tables from DataBricks

Question

Being new to Datawarehouse, I have a new requirement to create EXTERNAL TABLE from Datalake(GEN1/GEN2) into DWH from Databricks. I used the link to create the below code.

// Set up the Blob storage account access key in the notebook session conf.
spark.conf.set(
  "fs.azure.account.key.<your-storage-account-name>.blob.core.windows.net",
  "<your-storage-account-access-key>")

// Get some data from a SQL DW table.
val df: DataFrame = spark.read
  .format("com.databricks.spark.sqldw")
  .option("url", "jdbc:sqlserver://<the-rest-of-the-connection-string>")
  .option("tempDir", "wasbs://<your-container-name>@<your-storage-account-name>.blob.core.windows.net/<your-directory-name>")
  .option("forwardSparkAzureStorageCredentials", "true")
  .option("dbTable", "my_table_in_dw")
  .load()

The code that I have written

%scala

Class.forName("com.databricks.spark.sqldw.DefaultSource")

import org.apache.spark.sql.functions._ 
import org.apache.spark.sql.{DataFrame, SQLContext}


spark.conf.set("fs.azure.account.key.xxxxxxxxx.blob.core.windows.net", "xxxxxxxxxxxxxxx")

    // Load data from a SQL DW query
   val df: DataFrame = spark.read
  .format("com.databricks.spark.sqldw")
  .option("url", "jdbc:sqlserver://xxxxxxxxxxx.database.windows.net:1433;database=xxxxxxxx")
  .option("tempDir", "wasbs://[email protected]")
  .option("forwardSparkAzureStorageCredentials", "true")
  .option("dbTable", "dbo.EXT_TEST") 
  .load()

This is throwing an error : com.databricks.spark.sqldw.SqlDWConnectorException: Exception encountered in SQL DW connector code. Where am I going wrong? Any help would be apreciated.

Answer 1

Make sure to pass the "tempDir" as shown in the below format.

tempDir = "wasbs://" + blobContainer + "@" + blobStorage +"/tempDirs"

Reference: Load data into Azure SQL Data Warehouse

You may refer the suggestions outlined on GitHub issue, which addresses similar issue.

Hope this helps.