AMAZON S3 ADDS NEW FUNCTIONALITY FOR CONDITIONAL WRITES

Summary from the TLDR newsletter

Amazon S3 can now perform conditional writes that evaluate if an object is unmodified before updating it. This will help developers coordinate simultaneous writes to the same object and prevent multiple concurrent writers from unintentionally overwriting the object without knowing the state of its content. Conditional writes simplify how distributed applications with multiple clients concurrently update data across shared datasets. The new conditional header can help improve the efficiency of large-scale analytics, distributed machine learning, and other highly parallelized workloads by offloading compare and swap operations to S3. The new conditional-write functionality is available at no additional charge in all AWS regions.