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Amazon S3 Adds Put-If-Match (Compare-and-Swap)
Discover more about what's new at AWS with Amazon S3 adds new functionality for conditional writes
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. 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.
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