Capgemini Pyspark Developer Interview Questions and Answers

Q1. Why Spark is used?
Ans. 
Spark is used for big data processing due to its speed, scalability, and ease of use.
• Spark is used for processing large volumes of data quickly and efficiently.

• It offers in-memory processing which makes it faster than traditional MapReduce.

• Spark provides a wide range of libraries for diverse tasks like SQL, streaming, machine learning, and graph processing.

• It can run on various platforms like Hadoop, Kubernetes, and st...read more
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Q2. What are RDDs and DataFrames
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RDDs and DataFrames are data structures in Apache Spark for processing and analyzing large datasets.
• RDDs (Resilient Distributed Datasets) are the fundamental data structure of Spark, representing a collection of elements that can be operated on in parallel.

• DataFrames are distributed collections of data organized into named columns, similar to a table in a relational database.

• DataFrames are built on top of RDDs, providi...read more
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Basic python coding, list, dict, generators etc

Q1. Salary negotiation
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Q1. Conceptual questions
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Q1. Basic SQL and Python Questions
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Q1. What are oops concepts in java, explain real time scenario
Ans. 
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
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Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
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SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
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Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
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Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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