Amazon S3 and Cloud Front -

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how integrate amazon cloud front , s3 in photo sharing application?

i upload s3, , return cloudfront url has not been successful because appears there latency between s3 , cloudfront such returned url not valid.

does know how can work around this?

facebook uses akamai , if upload image available.

would appreciate ideas on this.

you must trying fetch object immediately through cloudfront. i'm unsure why might be, hitting limits of s3's eventual consistency model.

when upload object, message takes tiny amount of time propagate across s3 service. under 1 second , hard detect. (in previous life job, found reasonably guarantee files arrived within 10 seconds, , 99.9% within 1 second)

here's official word aws; it's worth reading whole page:

a process writes new object amazon s3 , lists keys within bucket. until change propagated, object might not appear in list.

there's longer discussion on stackoverflow question; assuming using standard s3 bucket, need change endpoint take advantage of read-after-write model.

further reading: * instrumental: why should stop using us-standard region in s3. right now™ * read-after-write consistency in amazon s3 (from 2009, contains dated info)

one way can debug/prove calling getobjectmetadata right before cloudfront call. should fail in case.


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