AWS, Cloud Computing

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Transform Your ETL Workflow with AWS Glue

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Introduction to AWS Glue

AWS Glue is a serverless, fully-managed solution that provides ETL expertise. Extract, transform, and load is called ETL. With the aid of this service, you can easily categorize your data, modify it, augment it, and transmit it swiftly and safely between distinct information repositories. Extensive statistical streams that use the Amazon Glue service are updated, harmonized, encrypted, and monitored. It delivers a virtualized solution by minimizing the complicated tasks inherent in driving application development. Amazon Glue combines key data integration capabilities into a single service.

Those include integrated categorization, efficient ETL, data retrieval, cleansing, and transforming. There is no infrastructure to maintain due to it being serverless.

Amazon Glue provides the capability across various loading conditions and types of consumers by offering necessary flexibility for all workloads, including ETL, ELT, and broadcasting in a single service.

How does AWS Glue Work?


You would generate jobs using Amazon Glue using the specifications of the table in our Data Catalog. Jobs typically comprised scripts containing the computing logic required for the transformation. Triggers are utilized to initiate jobs periodically or per a predefined event. You choose which source data populates our target and where our target information is kept. Amazon Glue generates the required code to convert our raw data to target according to your given data. You can also submit scripts in the Amazon Glue User Experience or API to process our dataset.

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Data sources for ETL operation

The following systems and databases can be accessed and written using AWS Glue:

  • Amazon S3
  • DynamoDB by Amazon
  • Amazon Redshift
  • Relational Database Service via Amazon (Amazon RDS)
  • Accessible using JDBC third-party databases
  • Combining Amazon Document DB and MongoDB (with MongoDB compatibility)
  • More market connectors, in addition to Apache Spark plugins

Amazon Glue Data Catalog

The Amazon Glue Data Catalog provides a comprehensive metadata repository for all the data assets from different sources of data. It delivers a unified interface to store and explore data regarding data formats, schemas, and sources. This catalog serves the purpose of an Amazon Glue ETL job throughout execution to grasp data attributes and ensure reliable data processing.

  • Crawler

The generation of metadata tables in the Amazon Glue Data Catalog by software that links to a data repository (source or target) elaborates through a predetermined set of classifiers to decide the architecture for given data.

  • Classifier

It determines the data’s schema. AWS Glue supports classifiers for common file types like CSV, JSON, AVRO, XML, and others.

  • Database

It is a logical arrangement of a grouping of associated Data Catalog table definitions in AWS Glue.

  • Connections

It possesses the characteristics needed to get connected to your data store. It generates a reliable outcome between RDS (Postgres, MySQL, etc.), Redshift, ODBC, or JDBC servers, permitting Glue to retrieve the data held there.

  • Tables

Tables are not your typical relational data fields; rather, they are metadata table definitions for data sources as opposed to the definitions of the data. A Glue table shows you where the data is and what data fields and types you should find there, similar to a link with a preview. As well as data in traditional data stores like RDS tables, Glue tables can describe file-based information stored in Amazon S3, such as Parquet, CSV, or JSON. To be readily available, the latter sources should be interconnected and crawled.

ETL Operation

The scripts and tools used to extract, transform, and load data into the suitable point are kept in the ETL section. This area includes the information catalog’s set-up data.

The Jobs seem to be the heart of Glue ETL. A job comprises a script that can retrieve and modify data from the data catalog’s sources and modify it. You can construct your script in Python (PySpark) or Scala, or Glue can programmatically generate one. By attaching to a zip file in S3, Glue also facilitates you to import third-party modules and custom code within your project. We confined the Glue-specific code in the job script because we’d been developing before Glue could be run locally and subsequently migrated the rest.

A subsection of jobs termed “ML Transforms” “provides machine abilities to construct customized transforms to clean up your data.” For example, you can connect data stores from the catalogs and “tune transform” the data to identify duplicate data.

Run jobs are initiated. They accept the cron command and can perform on request, on schedule, or in reply to a job event.

Use Cases

  • Run queries using an Amazon S3 Data Lake: Aws Glue can render your data accessible for analytics without transferring it.
  • Investigate the log data in your Data Warehouse: ETL scripts are written to convert, compress, and enhance data from source to target.
  • Construct an event-driven ETL pipeline: By initiating AWS Glue ETL jobs with an AWS Lambda function, you can conduct an ETL process as soon as new data becomes available in Amazon S3.
  • A different overview of your data from several sources: With the Amazon Glue Data Catalog, you can search for and find all your datasets while retaining all required metadata in one repository.


Using the Amazon Well-Architected Framework guidance, we outlined some industry standards for creating and managing your data pipeline with AWS Glue in this blog. We further described various common design paradigms where AWS Glue might be implemented in a data processing pipeline.

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CloudThat is also the official AWS (Amazon Web Services) Advanced Consulting Partner and Training partner and Microsoft Gold Partner, helping people develop knowledge of the cloud and help their businesses aim for higher goals using best in industry cloud computing practices and expertise. We are on a mission to build a robust cloud computing ecosystem by disseminating knowledge on technological intricacies within the cloud space. Our blogs, webinars, case studies, and white papers enable all the stakeholders in the cloud computing sphere.

Drop a query if you have any questions regarding AWS Glue and I will get back to you quickly.

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1. How does AWS Glue relate to AWS Lake Formation?

ANS: – Amazon Web Services (AWS) includes two services, AWS Glue, and AWS Lake Formation, which have been commonly integrated in data lake scenarios. Data may be easily transferred between different data repositories and formats owing to the fully managed ETL (extract, transform, load) service offered by AWS Glue. It supplies a central metadata repository where sources of data, transformations, and job details are kept. Aws Glue can produce ETL code based on the metadata and supports various data sources and formats. On the other hand, AWS Lake Creation is a service that makes it easier to create, secure, and manage data lakes on AWS. It comprises functionalities and offers a centralized console for building and managing a data lake.

2. What analytics services use the AWS Glue Data Catalog?

ANS: – The AWS Glue Data Catalog’s metadata may be widely obtainable by Glue ETL, Amazon Athena, Amazon EMR, Amazon Redshift Spectrum, and other services.

WRITTEN BY Ritushree Dutta



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