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Magazine3 Technologies Interview Questions and Answers

Updated 16 Oct 2024
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Q1. What is difference between Cloud Run and Cloud Functions

Ans.

Cloud Run is a fully managed compute platform that automatically scales your stateless containers, while Cloud Functions is a serverless execution environment for building and connecting cloud services.

  • Cloud Run is designed for running containerized applications, while Cloud Functions is designed for running single-purpose functions.

  • Cloud Run allows you to run any stateless container, while Cloud Functions only supports specific programming languages like Node.js, Python, and...read more

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Q2. What is Data WareHouse..?

Ans.

A Data Warehouse is a centralized repository that stores integrated data from multiple sources for analysis and reporting.

  • Data Warehouses are designed for query and analysis rather than transaction processing.

  • They often contain historical data and are used for decision-making purposes.

  • Data Warehouses typically use a dimensional model with facts and dimensions.

  • Examples of Data Warehouse tools include Amazon Redshift, Snowflake, and Google BigQuery.

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Q3. What is the Underlying Architecture of bigquery

Ans.

BigQuery is a fully-managed, serverless data warehouse that uses a distributed architecture to process and analyze large datasets.

  • BigQuery uses a distributed architecture to store and process data, allowing for scalability and high performance.

  • It separates storage and compute, enabling users to scale each independently based on their needs.

  • BigQuery leverages Google's infrastructure to automatically handle tasks like replication, sharding, and load balancing.

  • It uses a columnar...read more

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Q4. Tell me about Azure data bricks

Ans.

Azure Databricks is a unified analytics platform that provides collaborative environment for big data and machine learning.

  • Azure Databricks is built on Apache Spark and provides a collaborative workspace for data engineers, data scientists, and machine learning engineers.

  • It offers integrated notebooks for interactive data exploration and visualization.

  • Azure Databricks allows for seamless integration with other Azure services like Azure Data Lake Storage, Azure SQL Data Wareho...read more

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Discover Magazine3 Technologies interview dos and don'ts from real experiences

Q5. nth highest salary, word count in pyspark

Ans.

To find the nth highest salary in pyspark, use the window function with row_number and filter on the desired rank.

  • Use window function with row_number to assign a rank to each salary

  • Filter the result to get the row with the desired rank

  • Example: df.withColumn('rank', F.row_number().over(Window.orderBy(F.col('salary').desc()))).filter(F.col('rank') == n).select('salary')

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Q6. Nested Queries in Bigquery..?

Ans.

Nested queries in BigQuery allow for querying data from within another query, enabling complex data analysis.

  • Nested queries are queries that are embedded within another query

  • They can be used to perform subqueries to filter, aggregate, or manipulate data

  • Nested queries can be used in SELECT, FROM, WHERE, and HAVING clauses

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Q7. What are spark optimization techniques

Ans.

Spark optimization techniques improve performance and efficiency of Spark jobs.

  • Partitioning data correctly to avoid data shuffling

  • Caching intermediate results to avoid recomputation

  • Using appropriate data formats like Parquet for efficient storage and retrieval

  • Tuning memory settings for optimal performance

  • Avoiding unnecessary data transformations

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Interview Process at Magazine3 Technologies

based on 19 interviews
3 Interview rounds
Technical Round - 1
Technical Round - 2
HR Round
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