Genpact Data Engineer Interview Questions and Answers

Different types of joins available in Databricks include inner join, outer join, left join, right join, and cross join.

• Inner join: Returns only the rows that have matching values in both tables.

• Outer join: Returns all rows when there is a match in either table.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Cross join: Returns the Cartesian prod...read more

Implementing fault tolerance in a data pipeline involves redundancy, monitoring, and error handling.

• Use redundant components to ensure continuous data flow

• Implement monitoring tools to detect failures and bottlenecks

• Set up automated alerts for immediate response to issues

• Design error handling mechanisms to gracefully handle failures

• Use checkpoints and retries to ensure data integrity

To connect to different services in Azure, you can use Azure SDKs, REST APIs, Azure Portal, Azure CLI, and Azure PowerShell.

• Use Azure SDKs for programming languages like Python, Java, C#, etc.

• Utilize REST APIs to interact with Azure services programmatically.

• Access and manage services through the Azure Portal.

• Leverage Azure CLI for command-line interface interactions.

• Automate tasks using Azure PowerShell scripts.

Spark architecture involves transformations like map, filter, reduce, and join. Python programs can be written using PySpark API.

• Spark architecture includes components like Driver, Executor, and Cluster Manager.

• Transformations like map, filter, reduce, and join are commonly used in Spark.

• PySpark API allows writing Python programs for Spark applications.

• Example: Using map transformation to square each element in an RDD.

Linked Services are connections to external data sources or destinations in Azure Data Factory.

• Linked Services define the connection information needed to connect to external data sources or destinations.

• They can be used in Data Factory pipelines to read from or write to external systems.

• Examples of Linked Services include Azure Blob Storage, Azure SQL Database, and Amazon S3.

AutoLoader is a feature in data engineering that automatically loads data from various sources into a data warehouse or database.

• Automates the process of loading data from different sources

• Reduces manual effort and human error

• Can be scheduled to run at specific intervals

• Examples: Apache Nifi, AWS Glue