Summary:
There are blobs that fail to scrub and terminate the process early for a variety of reasons; when this is running as a background task, it'd be nice to get the remaining keys scrubbed, so that you don't have a large number of keys to fix up later.
Instead of simply outputting to stdout, write keys to one of three files in the format accepted on stdin:
1. Success; you can use `sort` and `comm -3` to remove these keys from the input dat, thus ensuring that you can continue scrubbing.
2. Missing; you can look at these keys to determine which blobs are genuinely lost from all blobstores, and fix up.
3. Error; these will need running through scrub again to determine what's broken.
Reviewed By: krallin
Differential Revision: D23574855
fbshipit-source-id: a613e93a38dc7c3465550963c3b1c757b7371a3b
Summary: There are no users waiting on manual scrub, so set it to use the background session mode.
Reviewed By: krallin
Differential Revision: D23054581
fbshipit-source-id: 985bcadbaf17d2a8c92fdec811ecb239cbca7b37
Summary: For populating the XDB blobstore, we'd like to copy data from Manifold - the easiest way to do that is to exploit MultiplexedBlobstore's scrub mode to copy data directly.
Reviewed By: krallin
Differential Revision: D22373838
fbshipit-source-id: 550a9c73e79059380337fa35ac94fe1134378196
