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We use a similar approach with TrailDB. You can make S3 access totally seamless with user-space page fault handling, which is pretty cool: http://tech.adroll.com/blog/data/2016/11/29/traildb-mmap-s3....

This is pretty cool. Do you invalidate all pages if the file changes upstream on S3?

In our case all blobs in S3 are immutable, so no need to invalidate anything.