Wipro Technical Lead Interview Questions, Process, and Tips

Spark optimization techniques involve various strategies to improve performance and efficiency.

• Use partitioning to distribute data evenly

• Cache intermediate results for reuse

• Avoid shuffling data unnecessarily

• Optimize joins by broadcasting smaller tables

• Use appropriate data serialization formats

Hive table loads can be done incrementally by using partitioning or by using timestamp columns.

• Partition the table based on a column like date or timestamp to load data incrementally

• Use dynamic partition inserts to add new data to specific partitions

• Utilize timestamp columns to filter and load only new data

• Consider using tools like Apache NiFi or Apache Sqoop for efficient incremental data loading

Use DISTINCT keyword in SELECT query to eliminate duplicate records in a Hive table

• Use SELECT DISTINCT * FROM table_name to retrieve unique records

• Consider using GROUP BY clause with appropriate columns to eliminate duplicates

• Utilize the ROW_NUMBER() window function to assign a unique row number to each record and filter out duplicates

Dependency Injection is a design pattern used in Magento 2 to inject dependencies into a class.

• Dependency Injection is a way to achieve loose coupling between classes.

• It allows for easier testing and maintenance of code.

• In Magento 2, dependencies are injected through constructor or setter methods.

• Example: injecting a logger object into a class that needs to log messages.

Virtual Type tag in Magento2 is used to create virtual classes and objects.

• Virtual types are defined in XML files and can be used to create objects without explicitly defining a class

• They are useful for creating objects that require complex configuration or dependencies

• Virtual types can be used in dependency injection and factory classes

• Example: Creating a virtual type for a custom payment method that requires addition

Proxy design pattern is a structural pattern that provides a surrogate or placeholder for another object to control access to it.

• Used to provide a level of indirection when accessing an object

• Can be used to implement lazy loading, caching, access control, etc.

• Example: Magento 2 uses proxy pattern to load product data only when it is needed

• Example: Proxy pattern can be used to restrict access to sensitive data or resour

Factory design pattern in Magento 2 is used to create objects without exposing the creation logic to the client.

• Factory pattern is a creational pattern

• It provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created

• In Magento 2, factory classes are used to create objects of a specific class

• Factory classes are generated automatically by Magento 2's co...read more

Spring Boot is a Java-based framework used for building standalone, production-grade applications.

• Spring Boot provides a simpler and faster way to set up, configure, and run both web and non-web applications.

• It eliminates the need for XML configurations and boilerplate code.

• It comes with embedded servers like Tomcat, Jetty, and Undertow, making it easy to deploy applications.

• It provides a wide range of starter projects...read more

Spring Boot provides rapid application development and microservices architecture.

• Easy configuration and setup

• Embedded servers for faster development

• Auto-configuration of dependencies

• Supports multiple data sources

• Promotes microservices architecture

• Provides a wide range of plugins and extensions

• Facilitates easy testing and debugging

• Reduces boilerplate code

• Improves productivity and efficiency