https://aws.amazon.com/about-aws/whats-new/2024/11/amazon-s3-functionality-conditional-writes/

Skip to main content
Click here to return to Amazon Web Services homepage
About AWS Contact Us Support   English   My Account  
Sign In
Create an AWS Account

  * re:Invent
  * Products
  * Solutions
  * Pricing
  * Documentation
  * Learn
  * Partner Network
  * AWS Marketplace
  * Customer Enablement
  * Events
  * Explore More

[                    ]
Close

  * `rby
  * Bahasa Indonesia
  * Deutsch
  * English
  * Espanol
  * Francais
  * Italiano
  * Portugues

  * Tieng Viet
  * Turkce
  * Russkii
  * aithy
  * Ri Ben Yu 
  * hangugeo
  * Zhong Wen  (Jian Ti )
  * Zhong Wen  (Fan Ti )

Close

  * My Profile
  * Sign out of AWS Builder ID
  * AWS Management Console
  * Account Settings
  * Billing & Cost Management
  * Security Credentials
  * AWS Personal Health Dashboard

Close

  * Support Center
  * Expert Help
  * Knowledge Center
  * AWS Support Overview
  * AWS re:Post

Click here to return to Amazon Web Services homepage
Get Started for Free
Contact Us
[                    ]
  * re:Invent
  * Products
  * Solutions
  * Pricing
  * Introduction to AWS
  * Getting Started
  * Documentation
  * Training and Certification
  * Developer Center
  * Customer Success
  * Partner Network
  * AWS Marketplace
  * Support
  * AWS re:Post
  * Log into Console
  * Download the Mobile App

Amazon S3 adds new functionality for conditional writes

Posted on: Nov 25, 2024

Amazon S3 can now perform conditional writes that evaluate if an
object is unmodified before updating it. This helps you coordinate
simultaneous writes to the same object and prevents multiple
concurrent writers from unintentionally overwriting the object
without knowing the state of its content. You can use this capability
by providing the ETag of an object using S3 PutObject or
CompleteMultipartUpload API requests in both S3 general purpose and
directory buckets.

Conditional writes simplify how distributed applications with
multiple clients concurrently update data across shared datasets.
Similar to using the HTTP if-none-match conditional header to check
for the existence of an object before creating it, clients can now
perform conditional-write checks on an object's Etag, which reflects
changes to the object, by specifying it via the HTTP if-match header
in the API request. S3 then evaluates if the object's ETag matches
the value provided in the API request before committing the write and
prevents your clients from overwriting the object until the condition
is satisfied. This new conditional header can help improve the
efficiency of your large-scale analytics, distributed machine
learning, and other highly parallelized workloads by reliably
offloading compare and swap operations to S3.

This new conditional-write functionality is available at no
additional charge in all AWS Regions. You can use the AWS SDK, API,
or CLI to perform conditional writes. To learn more about conditional
writes, visit the S3 User Guide.

Sign In to the Console

Learn About AWS

  * What Is AWS?
  * What Is Cloud Computing?
  * AWS Accessibility
  * AWS Inclusion, Diversity & Equity
  * What Is DevOps?
  * What Is a Container?
  * What Is a Data Lake?
  * What is Artificial Intelligence (AI)?
  * What is Generative AI?
  * What is Machine Learning (ML)?
  * AWS Cloud Security
  * What's New
  * Blogs
  * Press Releases

Resources for AWS

  * Getting Started
  * Training and Certification
  * AWS Solutions Library
  * Architecture Center
  * Product and Technical FAQs
  * Analyst Reports
  * AWS Partners

Developers on AWS

  * Developer Center
  * SDKs & Tools
  * .NET on AWS
  * Python on AWS
  * Java on AWS
  * PHP on AWS
  * JavaScript on AWS

Help

  * Contact Us
  * Get Expert Help
  * File a Support Ticket
  * AWS re:Post
  * Knowledge Center
  * AWS Support Overview
  * Legal
  * AWS Careers

Create an AWS Account
 
 
 
 
 
 
 
 
Amazon is an Equal Opportunity Employer: Minority / Women /
Disability / Veteran / Gender Identity / Sexual Orientation / Age.

  * Language
  * `rby
  * Bahasa Indonesia
  * Deutsch
  * English
  * Espanol
  * Francais
  * Italiano
  * Portugues
  * Tieng Viet
  * Turkce
  * Russkii
  * aithy
  * Ri Ben Yu 
  * hangugeo
  * Zhong Wen  (Jian Ti )
  * Zhong Wen  (Fan Ti )

  * Privacy
  * |
  * Accessibility
  * |
  * Site Terms
  * |
  * Cookie Preferences
  * |
  * (c) 2024, Amazon Web Services, Inc. or its affiliates. All rights
    reserved.

Ending Support for Internet Explorer

Got it
AWS support for Internet Explorer ends on 07/31/2022. Supported
browsers are Chrome, Firefox, Edge, and Safari. Learn more >>
Got it