Summary:
Finally, arc diff works again! This has been sitting in my repo for a while.
I would like some comments on my BlobStore benchmark. We don't have to check this in.
Also, I don't do any fsync in the BlobStore, so this is all extremely fast. I'm not sure what durability guarantees we need from the BlobStore.
Test Plan: Nope
Reviewers: dhruba, haobo, kailiu, emayanke
Reviewed By: dhruba
CC: leveldb
Differential Revision: https://reviews.facebook.net/D13527
Igor Canadi