Read consistency after overwrite of S3 and ElastiCache

Question

I have a few questions regarding s3:
1. After we overwrite an object in S3 is there any issues like for a brief amount of time the read request will show older version of the object and if this is true what will be the time all the servers will be updated to the new version?
2. Is S3 suitable for real time applications that require immediate access to the latest data after an overwrite?
3. Is because of these reasons we should go with elasticache?
4. How ElastiCache ensure this read after overwrite consitency?

Answer

Hi,

1. S3 supports strong read-after-write consistency: https://aws.amazon.com/blogs/aws/amazon-s3-update-strong-read-after-write-consistency/
2.  based on 1., yes
3. No. Elasticache is to be used more when very low-latency is expected: elasticache reads from RAM while S3 from disk
4. No. Elasticache does not provide read after write consistency "out of the box": see question "`How does ElastiCache keep my read replica up-to-date with its primary node ?`" of https://aws.amazon.com/elasticache/faqs/
Best,

Didier

Read consistency after overwrite of S3 and ElastiCache

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