Introduction

It is a famous quote that the future belongs to those who prepare for it. Now you are here to prepare for your interview and this shows your seriousness for the future. Below are some frequently asked AWS Glue interview questions that will definitely help you in enhancing your knowledge. Here we divide these questions into two categories, first is AWS Glue Interview Questions for freshers and second is for experienced professionals. So let’s come to the question.

AWS Glue Interview Questions For Freshers

Here We learn the First Category of AWS Glue Interview Questions for Freshers, and then we will move to our Second Category which is, AWS Glue interview Questions for Experienced Professionals.

1) What is AWS Glue? (Read carefully – Mostly this is the first question asked in AWS Glue Interview Questions)

AWS Glue is simply an event-driven, serverless ETL tool provided by Amazon. It is a part of Amazon Web Services. With AWS Glue we don’t need any additional coding scripts because first it runs code in response to events and then automatically manages the computing resources needed for that code. It helps you extract data from multiple sources, transform it to meet the needs of your project, and load it to the destination of your choice.

AWS Glue Working

AWS Glue Interview Questions

2) What are the key features of AWS Glue?

  • AWS Glue Data Catalog is a technical metadata repository in the AWS cloud. It is used to keep references to data that is used as sources and targets.
  • Automatic schema discovery Glue is used to automate crawlers that collect, store, and classify schema-related data into data catalogs that can be used later.
  • Automatic code generation and customization the ETL (extract, transform, load) process in AWS Glue automatically generates and optimizes code.
  • Provides API for developers The API provides additional tools for developers to work effectively and efficiently with the AWS Glue service.
  • Job scheduler Multiple jobs can be started at the same time in AWS Glue by scheduling and calling jobs using event-based triggers or on-demand triggers.
  • Developers endpoints Developers can use it to debug Glue, develop custom readers, writers, and transformations. And then it can also be imported into a custom library.

3) Why we are using AWS Glue?

  • It is a serverless data integration.
  • It’s a cost effective option.
  • Scala or Python is used in this
  • AWS Glue provides easy-to-use tools to create and track triggered activities.
  • It reduces data analysis time

Also Read – AWS Lambda Interview Questions

4) What are the difference between classifier and crawler in AWS Glue?

A classifier in Aws Glue is used to classify data stored in S3 and then used for ETL purposes. While crawlers are used to scan different types of data stored in S3.

5) Please give me an example of automated data processing using AWS Glue.

Last time I created an automated workflow that extracts data from various sources, transforms it into a consistent format, and then loads it into a data warehouse for analysis.

6) Explain the component of aws glue?

There are four components in aws glue –

  1. Data catalogs – it is a technical metadata repository which is used to keep references to data that is used as sources and targets.
  2. Crawler – it is used to scan different types of data stored in S3.
  3. Jobs – Jobs are workflows and it uses a data catalog to process data.
  4. Triggers – It automate the job execution process with event-based triggers or on-demand triggers.

7) Is there an alternative to AWS Glue? (Read carefully this question is mostly asked in AWS Glue interview questions)

Yes, there are some alternatives –

  • IBM DataStage
  • Talend Open Studio
  • Apache Airflow
  • Informatica PowerCenter

8) what are the limitations of aws glue?

  • Skilled team required.
  • Only support structured databases, not traditional databases.
  • Problems with real-time data in complex operations.
  • Job bookmarks are not supported.
  • It can be costly for large scale integration project.

9) What programming languages ​​are used in AWS Glue?

To develop ETL scripts, AWS Glue supports only two programming languages ​​as of now

  • Scala
  • Python

AWS Glue Interview Questions For Experienced Professionals –

Here We learn the Second Category which is, AWS Glue interview Questions for Experienced Professionals.

1) When an AWS Glue job times out, how do we retry it?

Retrying works if a task has failed, it does not work if it has timed out. To retry, we will need to create custom logic, like listening to Event Bridge Glue timeout events and then, after that, run a Lambda to restart our task.

2) What is AWS Glue Studio?

AWS Glue Studio is a drag and drop user interface that creates, manages, and monitors AWS Glue ETL jobs. It is used to define sources, transformations and targets by which ETL code is automatically generated. (This was also an important AWS Glue interview questions)

Also Read – AWS EC2 interview questions

3) What are some of the differences between using AWS Glue’s dynamic frames and Apache Spark’s data frames?

AWS Glue Interview Questions

4) How to use Machine Learning Transformations for data cleansing and preparation in aws glue?

Follow the steps given below to use Machine Learning Transformations for data cleansing and preparation in aws glue –

  • Create a Crawler
  • Define Schema
  • Develop ML Transforms
  • Train ML Model
  • Apply ML Model
  • Create Job
  • Execute and Monitor

5) Using Glue, what data stores can I crawl?

The crawler can crawl both table-based and file-based data stores. These are some of the data stores that the crawler can crawl –

  • Amazon Simple Storage Service (Amazon S3)
  • Amazon DynamoDB Amazon Redshift
  • Amazon Relational Database Service (Amazon RDS)
  • Amazon Aurora
  • Microsoft SQL Server
  • My SQL
  • Oracle

6) Which AWS services use AWS Glue Data Catalog?

These are some AWS services that use AWS Glue Data Catalog –

  • Amazon EMR
  • Amazon Athena
  • AWS Lake Creation
  • Amazon Redshift Spectrum
  • AWS Glue Data Catalog Client for Apache Hive Metastore

Conclusion

We know there is a lot to learn but we have included the most commonly asked AWS Glue interview questions and I think you will get some knowledge from it. If you want to know more about interview or technical preparation for your IT job then please contact us we can definitely help you with that. We helped many students to get their dream job. And now with our help they’ve gotten to where they wanted in less time than they ever imagined. Just contact us for more information.