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Cognizant Big Data Engineer Interview Questions, Process, and Tips for Experienced
Cognizant Big Data Engineer Interview Experiences for Experienced
1 interview found
Selected
I applied via Naukri.com and was interviewed in Apr 2023. There were 3 interview rounds.
(5 Questions)
- Q1. What is speculative execution in Hadoop?
- Ans.
Speculative execution in Hadoop is a feature that allows the framework to launch duplicate tasks for a job, with the goal of completing the job faster.
Speculative execution is used when a task is taking longer to complete than expected.
Hadoop identifies slow-running tasks and launches duplicate tasks on other nodes.
The first task to complete is used, while the others are killed to avoid duplication of results.
This help...
- Q2. Spark Architecture
- Q3. Difference in list , tuple,sets
- Ans.
Lists are mutable ordered collections, tuples are immutable ordered collections, and sets are mutable unordered collections.
Lists are mutable and ordered, allowing for duplicate elements. Example: [1, 2, 3, 3]
Tuples are immutable and ordered, allowing for duplicate elements. Example: (1, 2, 3, 3)
Sets are mutable and unordered, not allowing for duplicate elements. Example: {1, 2, 3}
- Q4. Difference in rank, dense rank in sql
- Ans.
Rank assigns a unique rank to each distinct row, while dense rank assigns consecutive ranks to rows with the same values.
Rank function assigns unique ranks to each distinct row in the result set
Dense rank function assigns consecutive ranks to rows with the same values
Rank function leaves gaps in the ranking sequence if there are ties, while dense rank does not
- Q5. Add data into a partitioned hive table
- Ans.
To add data into a partitioned hive table, you can use the INSERT INTO statement with the PARTITION clause.
Use INSERT INTO statement to add data into the table.
Specify the partition column values using the PARTITION clause.
Example: INSERT INTO table_name PARTITION (partition_column=value) VALUES (data);
WAP to add index wise elements of a list . A=[1,2,3] , B=[4,5,7] C should be [5,7,10]
Interview Preparation Tips
- Spark Architecture
- Sql window functions
- Python data structures
- Spark and hive optimisation
- Pyspark dataframe operations
Skills evaluated in this interview
Interview questions from similar companies
I applied via Company Website and was interviewed in Nov 2023. There were 3 interview rounds.
(1 Question)
- Q1. Overall exp was good
(1 Question)
- Q1. Overall exp was good
(1 Question)
- Q1. Salary discussion
Manshi Raghuvanshi
(1 Question)
- Q1. Coalesce vs repartition
- Ans.
Coalesce is used to reduce the number of partitions in a DataFrame, while repartition is used to increase the number of partitions.
Coalesce is a narrow transformation that can only decrease the number of partitions without shuffling data.
Repartition is a wide transformation that can both increase or decrease the number of partitions and involves shuffling data across the cluster.
Coalesce is more efficient for reducing ...
Rank vs dense rank quetions ctes
Python data structure
Raj
Selected
I applied via Approached by Company and was interviewed before Oct 2022. There were 2 interview rounds.
(2 Questions)
- Q1. Scala , Hadoop Spark, SQL, sqoop
- Q2. Scala Hadoop Spark SQL sqoop
(1 Question)
- Q1. Scala Hadoop Spark SQL sqoop
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Jan 2021. There were 5 interview rounds.
Interview Questionnaire
2 Questions
- Q1. Mostly on Hive, scala questions for first round which is of 43 theory questions and one coding question was asked for
- Q2. 2nd and 3rd round would be on F2F online technical round where it was completely conversing about your project and the stuffs you had used while working. It would basically purely on your work experience s...
Interview Preparation Tips
Selected
I applied via Naukri.com and was interviewed in Mar 2024. There was 1 interview round.
(2 Questions)
- Q1. Tell. me about youself
- Q2. Sql question , pyspark questions
Data Engineer Interview Questions & Answers
Societe Generale Global Solution Centre
Anonymous
posted on 19 Nov 2024
Selected
I applied via Naukri.com and was interviewed in May 2024. There was 1 interview round.
1. Questions on spark basica
2. Sql coding questions
3. Java or scala basics
Selected
I applied via Naukri.com and was interviewed in Aug 2023. There were 4 interview rounds.
I will do tha study for all company cases
I will give aptitude test
(7 Questions)
- Q1. I will try to solved all technical issue
- Q2. Asked tha questions to releted data entry operator
- Q3. I take my work time
- Q4. Slove tha query who give me dara
- Q5. Give any response to short time
- Ans.
Respond promptly with concise information
Provide relevant details quickly
Avoid unnecessary elaboration
Be clear and concise in communication
- Q6. Asked how to do group discussion.
- Q7. How can slove tha all data questions
Interview Preparation Tips
(2 Questions)
- Q1. Self introduced and my skills knowledge
- Q2. My name name is Aasif and I have done my graduation b.com. I have good knowledge English and Hindi in oral and writing. I have done excel, ms word, PowerPoint Data entry.
(3 Questions)
- Q1. Study and skills
- Q2. Like my work speciality’s
- Q3. Study speciality’s
Interview Preparation Tips
Thanks
Daniyal Shaikh
(1 Question)
- Q1. Data Sceince related questions
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