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Python libraries commonly used by data engineers include Pandas, NumPy, Matplotlib, and Scikit-learn.
Pandas: Used for data manipulation and analysis.
NumPy: Provides support for large, multi-dimensional arrays and matrices.
Matplotlib: Used for creating visualizations and plots.
Scikit-learn: Offers machine learning algorithms and tools for data analysis.
PySpark is a Python API for Apache Spark, a powerful open-source distributed computing system.
PySpark allows users to write Spark applications using Python programming language.
It provides high-level APIs in Python for Spark's functionality, making it easier to work with large datasets.
PySpark can be used for data processing, machine learning, graph processing, and more.
Example: PySpark can be used to perform data anal...
Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads.
Provides ACID transactions for big data workloads
Ensures data reliability and quality by enabling schema enforcement and data versioning
Supports batch and streaming data processing
Improves data quality and reliability by enabling schema enforcement and data versioning
Create end to end pipelines in Data Factory with SQL and ASQL as source and target respectively.
Use Copy Data activity to move data from SQL source to ASQL target
Define linked services for SQL and ASQL in Data Factory
Create datasets for SQL and ASQL tables
Map columns between source and target datasets
Configure data flow activities for any transformations needed
Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.
Node.js uses an event-driven, non-blocking I/O model.
It has a single-threaded event loop that handles all I/O operations.
Node.js modules are cached to improve performance.
It supports both synchronous and asynchronous programming.
Node.js has a built-in HTTP server module for creating web servers.
It can be used for building scalable network applicatio
Call, apply and bind are methods used to set the value of 'this' in a function.
Call and apply are used to invoke a function with a specific 'this' value and arguments passed as an array or list respectively.
Bind is used to create a new function with a specific 'this' value and arguments passed as an array or list.
Call and apply are similar, but apply is used when the number of arguments is not known beforehand.
Bind ret...
Worker threads are lightweight and share memory, while child processes are heavier and have separate memory spaces.
Worker threads are useful for tasks that require parallel processing and sharing of data.
Child processes are useful for tasks that require isolation and fault tolerance.
Worker threads are faster to create and destroy than child processes.
Examples of worker thread libraries include pthreads and Java's Execu...
I applied via Naukri.com and was interviewed in Aug 2020. There were 3 interview rounds.
I applied via Campus Placement and was interviewed before Feb 2020. There were 6 interview rounds.
I applied via Company Website and was interviewed before Feb 2020. There was 1 interview round.
I applied via Campus Placement and was interviewed in Oct 2020. There were 4 interview rounds.
Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.
Start from the first element and compare it with the next element
If the next element is smaller, swap them
Repeat this process for all elements in the array
Continue this process until no more swaps are needed
A program to print all prime numbers
Take input from user for range of numbers
Loop through the range and check if each number is prime
Print the prime numbers
Hashmap is a data structure that stores key-value pairs and allows constant time access to values based on their keys.
Hashmap uses a hash function to map keys to indices in an array.
Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.
Examples of hashmap implementations include Java's HashMap class and Python's dict type.
Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.
Inheritance allows code reuse and promotes code organization.
The existing class is called the parent or superclass, and the new class is called the child or subclass.
The child class inherits all the properties and methods of the parent class and can also add new properties and methods.
For...
I applied via Walk-in and was interviewed in Mar 2021. There was 1 interview round.
I applied via Campus Placement and was interviewed before Dec 2021. There were 2 interview rounds.
Basic logical reasoning and verbal questions . Easy to clear
I applied via Campus Placement and was interviewed before Oct 2020. There were 3 interview rounds.
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