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mck35
Hi, we recently announced Quantcast File System version 1.2. Besides many bug fixes and improvements, it comes with the ability to use Amazon S3 as a backend store. You can check it out on QFS Github. I personally contributed to this release, and I'd be happy to answer any questions. Thanks.
lumens
For some context:

Quantcast moved off Hadoop in favor of a home-rolled solution (QFS) because of Hadoop wasn't scaling well to our needs (40PB+ data processed/day).

This release of QFS (https://github.com/quantcast/qfs) includes support for S3, among other improvements.

bertan
I wonder how it compares/relates to https://minio.io

Can it run on minio, for example?

mck35
One difference I see is that QFS is block-based and each file is composed of multiple S3 objects. Hence, there is no file size limit.