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There is a 5TB size limit in AWS S3 (TODO: check limits for other S3 implementations) , so larger files will need to be sharded over multiple S3 objects. The metadata of the shard UUIDs and their respective ranges would be stored in a container metadata object, and the name of this object would be is returned to the agent as a key. To distinguish container "shard metadata" objects from normal objects, the type in the URL could be changed to s3c, e.g.:
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name includes al ".shm" extension after the UUID.
s3://<bucketName>/<prefix>/o/UUID.shm
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