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Couldn't you just download the portion of the one file you want from S3? Unless EFS is significantly faster...

From a caching perspective, you wouldn't seem to gain much in lamda. You can cache in memory/tmpfs until your container eventually dies, and then you likely aren't on the same machine so there's no EFS level caching to take advantage of.

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Right that was my point. You most likely have to load the whole thing into memory, but in the rare case that you can seek directly to the right spot in the file, ECS might have an advantage for you in Lambda.

Yeah, I just meant that S3 has partial downloads, so you can still seek.

EFS/NFS makes a lot of sense I think when you have a lot of random/unpredictable access across large numbers of files. You could do the same thing with FUSE/S3 but across lots of smaller files/accesses I would think the overhead adds up faster.

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