Crisil Data Engineer Interview Questions and Answers

Aws, scala and cloud concept

Q1. Python question
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Q1. What is pip in python
Ans. 
pip is a package manager for Python that allows you to install and manage libraries and dependencies.
• pip is used to install Python packages from the Python Package Index (PyPI)

• It can also be used to uninstall packages, upgrade packages, and list installed packages

• Example: 'pip install numpy' installs the numpy package
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Q2. Questions on join
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Basic aptitude questions

Q1. SQL basics questions like joins
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Q2. Pandas basics for data manipulation
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Q1. Spark arcitecture
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Q2. Partitions and bucketing
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Q1. Windows function on sql
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Window functions in SQL are used to perform calculations across a set of table rows related to the current row.
• Window functions are used to calculate values based on a set of rows related to the current row

• They do not cause rows to become grouped into a single output row like aggregate functions

• Common window functions include ROW_NUMBER(), RANK(), DENSE_RANK(), and NTILE()
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Q1. Pandas questions
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Q1. Asked regarding the previous project
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Apptitude test happen in first go it was quite easy

GD happen between 10 group member we have speak for sometime

Q1. Question on OOPS
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Q2. Quesion on SQL and python
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Q1. Explain hadoop ecosystem
Ans. 
Hadoop ecosystem is a collection of open-source software tools used for distributed storage and processing of big data.
• Hadoop Distributed File System (HDFS) for storage

• MapReduce for processing

• Apache Hive for data warehousing

• Apache Pig for data analysis

• Apache Spark for real-time processing

• Apache HBase for NoSQL database

• Apache Kafka for real-time data streaming
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Q2. Explain YARN architecture
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YARN architecture is a resource management layer in Hadoop ecosystem for job scheduling and cluster resource management.
• YARN stands for Yet Another Resource Negotiator.

• It consists of ResourceManager, NodeManager, ApplicationMaster, and Container.

• ResourceManager manages resources and schedules applications.

• NodeManager runs on each node and manages resources available on that node.

• ApplicationMaster negotiates resources w...read more
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Q3. Hive external and internal tables
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Q4. Sort by and order by difference
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Sort by is used to arrange data in a specific order, while order by is used to specify the sorting order in SQL queries.
• Sort by is used in programming languages to arrange data based on a specific criteria

• Order by is used in SQL queries to specify the sorting order of the result set

• Sort by is more commonly used in programming languages like Python, while order by is used in SQL queries
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Q5. Broadcast and accumulator
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Q6. Optimization techniques
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Optimization techniques are methods used to improve the efficiency and performance of data processing.
• Use indexing to speed up data retrieval

• Implement caching to reduce redundant computations

• Utilize parallel processing for faster execution

• Optimize algorithms for better performance

• Use data compression techniques to reduce storage space
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Q1. It was a managerial round which was mostly around the project work and working experience in a team
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Q2. What was your role and responsisbility in the project
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Q3. Why is the approach of the project in this manner
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Q4. Few scenario based question
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Q1. Compensation and salary discussion
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