GlobalLogic Skin Trainer Interview Questions and Answers

Q1. What is mapreduce in Hadoop
Ans. 
MapReduce is a programming model used to process large datasets in parallel on a Hadoop cluster.
• MapReduce breaks down the input data into smaller chunks and processes them in parallel.

• It consists of two phases: Map phase and Reduce phase.

• Map phase processes the input data and produces intermediate key-value pairs.

• Reduce phase takes the output of Map phase and combines the values with the same key.

• Examples of MapReduce ...read more
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Q2. How spark lauches job on Yarn
Ans. 
Spark launches job on Yarn by creating an application master and containers for executors.
• Spark submits a job to Yarn ResourceManager

• Yarn launches an ApplicationMaster on a NodeManager

• ApplicationMaster requests containers for executors from ResourceManager

• Containers are launched on NodeManagers

• Executors run tasks on data partitions

• Results are returned to the driver program
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Q1. Tell about your self and experience
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Q2. Tell me about your self
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They have focused on logic while writing the code not actual implementation

Q1. Related to projects and technologies
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Q1. Basic concepts.
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Q1. One and one coding and technical questions.
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Q1. About previous work and responsibilities.
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Q1. Java concepts and java 8 related coding question
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Q1. Java 8 features
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Q1. Basic HR discussions
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Q1. It's easy to get into it
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Q2. Java basic interview questions
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Q3. Oppos interview concepts
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Q1. Whats is jvm and jdk
Ans. 
JVM is a virtual machine that executes Java bytecode. JDK is a software development kit that includes the JVM and other tools.
• JVM stands for Java Virtual Machine

• JVM is responsible for executing Java bytecode

• JDK stands for Java Development Kit

• JDK includes the JVM, compiler, debugger, and other tools

• JDK is used for developing Java applications
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Basic questions

Online test conducted

Coding online conducted

GD on random topic given

Q1. Technical round
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Q2. Basics of technology
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Q1. Indepth technical discussion
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Q1. About ourself , why should I hire you
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Q1. Peoplesoft peopletools
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Q2. App designer basics, sqr
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Q1. Salary expectations
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Round duration - 60 minutes
Round difficulty - Medium

This round started with 1 coding question related to Prime Numbers in which I was first asked to explain my approach and then write the pseudo code for it. This was followed by some preety standard questions from OOPS and Java.

Q1. 
Nth Prime Number Problem Statement
Find the Nth prime number given a number N.
Explanation:
A prime number is greater than 1 and is not the product of two smaller natural numbers. A prime number has exa...read more
Ans. 
The task is to find the Nth prime number given a number N.
• A prime number is a number greater than 1 that is not a product of two smaller natural numbers.

• Prime numbers have only two factors - 1 and the number itself.

• Start with a counter at 0 and a number at 2.

• Increment the number by 1 and check if it is prime.

• If it is prime, increment the counter.

• Repeat until the counter reaches N.

• Return the last prime number found.
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Q2. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class is a class that cannot be instantiated and can have both abstract and non-abstract methods. Interface is a blueprint for a class and can only have abstract methods.
• Abstract class can have constructors while interface cannot.

• A class can implement multiple interfaces but can only extend one abstract class.

• Abstract class can have instance variables while interface cannot.

• Abstract class can provide default i...read more
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Q3. What is the garbage collector in Java?
Ans. 
Garbage collector in Java is responsible for automatic memory management.
• Garbage collector automatically reclaims memory by freeing objects that are no longer referenced.

• It runs in the background and identifies unused objects based on reachability.

• Different garbage collection algorithms like Mark and Sweep, Copying, and Generational are used.

• Garbage collector can be tuned using JVM options like -Xmx and -Xms.

• Example: S...read more
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Q4. What is meant by exception handling?
Ans. 
Exception handling is a mechanism in programming to handle and manage errors or exceptional situations that may occur during program execution.
• Exception handling is used to catch and handle errors or exceptions in a program.

• It allows the program to gracefully handle errors and prevent abrupt termination.

• Exception handling involves the use of try-catch blocks to catch and handle exceptions.

• The catch block contains code ...read more
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Round duration - 60 minutes
Round difficulty - Medium

This round had 1 coding question related to LRU Cache where I had to code its implementation in a production-ready manner explaining my overall approach with proper complexity analysis. This was followed by some Mutithreading questions from Java and then at last the interviewer asked me some basic design patterns in Software Engineering and some more questions related to OOPS.

Q1. 
LRU Cache Design Problem Statement
Design and implement a data structure for a Least Recently Used (LRU) cache that supports the following operations:
• get(key) - Retrieve the value associated with the...read more
Ans. 
The question is about designing and implementing a data structure for LRU cache to support get and put operations.
• LRU cache is a cache replacement policy that removes the least recently used item when the cache reaches its capacity.

• The cache is initialized with a capacity and supports get(key) and put(key, value) operations.

• For each get operation, return the value of the key if it exists in the cache, otherwise return ...read more
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Q2. What are the start() and run() methods of the Thread class?
Ans. 
The start() method is used to start a new thread and execute the run() method.
• The start() method creates a new thread and calls the run() method.

• The run() method contains the code that will be executed in the new thread.

• Calling the run() method directly will not create a new thread.

• The start() method should be called to start the execution of the new thread.
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Q3. What is a BlockingQueue in the context of multithreading?
Ans. 
BlockingQueue is a thread-safe queue that blocks when it is full or empty.
• BlockingQueue is part of the Java Concurrency API.

• It provides methods like put() and take() to add and remove elements from the queue.

• When the queue is full, put() blocks until space becomes available.

• When the queue is empty, take() blocks until an element is available.

• It is commonly used in producer-consumer scenarios.
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Q4. What is thread starvation?
Ans. 
Thread starvation occurs when a thread is unable to access the CPU resources it needs to execute its tasks.
• Thread starvation happens when a thread is constantly waiting for a resource that is being monopolized by other threads.

• It can occur due to poor resource management or priority scheduling.

• Examples include a low-priority thread being constantly preempted by high-priority threads or a thread waiting indefinitely for
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Q5. What is a thread scheduler and how does time slicing work?
Ans. 
Thread Scheduler is responsible for managing the execution of multiple threads in a multitasking environment.
• Thread Scheduler determines the order in which threads are executed.

• It allocates CPU time to each thread based on priority and scheduling algorithm.

• Time Slicing is a technique used by Thread Scheduler to allocate a fixed time slice to each thread before switching to another.

• It ensures fair execution of threads a...read more
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Q6. Can you explain the SOLID principles in Object Oriented Design?
Ans. 
SOLID principles are a set of design principles that promote maintainability, extensibility, and reusability in object-oriented design.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes must be substitutable for their base types.

• I - Interface S...read more
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Q7. What makes a HashSet different from a TreeSet?
Ans. 
HashSet is an unordered collection that uses hashing to store elements, while TreeSet is a sorted collection that uses a binary search tree.
• HashSet does not maintain any order of elements, while TreeSet maintains elements in sorted order.

• HashSet allows null values, while TreeSet does not allow null values.

• HashSet has constant time complexity for basic operations like add, remove, and contains, while TreeSet has logarit...read more
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Round duration - 30 minutes
Round difficulty - Easy

This is a cultural fitment testing round. HR was very frank and asked standard questions. Then we discussed about my role.

Q1. Why should we hire you?
Ans. 
I have extensive experience in software development and a proven track record of delivering high-quality solutions.
• I have a strong technical background and expertise in various programming languages and frameworks.

• I have successfully led and delivered complex software projects on time and within budget.

• I am a quick learner and adapt easily to new technologies and methodologies.

• I have excellent problem-solving and analy...read more
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Q2. Why are you looking for a job change?
Ans. 
Seeking new challenges and growth opportunities in a different environment.
• Looking for a role that allows me to work on more complex projects.

• Interested in expanding my skill set and learning new technologies.

• Seeking a company culture that aligns with my values and promotes collaboration.

• Wanting to take on more leadership responsibilities and mentor junior engineers.

• Desire for better work-life balance or location chang
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