Walmart Labs Interview Questions, Process, and Tips

Q1. Why does zookeeper have odd number of nodes
Ans. 
Zookeeper uses odd number of nodes to ensure a majority quorum for leader election and data consistency.
• Odd number of nodes helps in avoiding split-brain scenarios where multiple nodes claim to be the leader

• With an odd number of nodes, a majority quorum can be established to elect a leader and maintain data consistency

• In case of network partitions, having an odd number of nodes ensures that there is always a majority t
Answered by AI
Add your answer

Q1. Basic Teradata and DBA questions.
Add your answer
Q2. Cloud technologies related questions.
Add your answer

Q1. Advanced DBA questions on Teradata.
Add your answer
Q2. How we document the processes in current project.
Add your answer

Q1. General Personal questions.
Add your answer
Q2. HR shared different perks and benefits.
Add your answer
Q3. Salary structure and negotiation.
Add your answer

Aptitude test to filter students for next round

Coding test Data structure Algorithm to filter for next round

Q1. Thread related question
Add your answer

Q1. Simple conversation
Add your answer

Q1. Recursive CTE related SQL
Add your answer
Q2. Python program to parse JSON
Ans. 
Python program to parse JSON
• Use the json module in Python to parse JSON data

• Use the loads() method to load JSON data into a Python dictionary

• Access the data in the dictionary using keys
Answered by AI
Add your answer

Q1. Advanced SQL on JOINs and Windowing
Add your answer
Q2. Spark Optimization on JOIN queries
Ans. 
Optimizing JOIN queries in Spark involves partitioning data, using broadcast joins, and optimizing shuffle operations.
• Partition data to avoid shuffling unnecessary data across the network

• Use broadcast joins for small tables that can fit in memory of each executor

• Optimize shuffle operations by tuning shuffle partitions and memory settings
Answered by AI
Add your answer

No case study was asked. HM asked about my experience and project details.

Coding round on D2C - codehers

Q1. Create stack using queue and vice-versa, some sql queries.
Add your answer
Q2. OSI model and other CS fundamentals
Add your answer

Q1. Send 0s to the back of the array.
Ans. 
Move all 0s to the end of the array while maintaining the order of other elements.
• Iterate through the array and keep track of the index to place non-zero elements.

• After iterating, fill the remaining positions with 0s.
Answered by AI
Add your answer

Q1. General HR questions
Add your answer

Easy medium level leetcode problems

Q1. Reverse a linkedlist, sorting algorithms
Ans. 
Reverse a linked list and discuss sorting algorithms.
• To reverse a linked list, you can use a three-pointer approach.

• Sorting algorithms include bubble sort, insertion sort, merge sort, quicksort, etc.

• Discuss the time complexity and space complexity of each sorting algorithm.

• Provide examples of how each sorting algorithm works.
Answered by AI
Add your answer

Q1. Java concepts, syncroniszed and one lld problem
Add your answer

Q1. Resume discussion, behavioural questions
Add your answer