Author: Darth Emmett

Next ID: 3

This data is expected to appear in approximately 2 out of every 1,000 documents with an average of 2 fields per document. Rough order of size is in the hundreds of kilobytes per Mustang shard.

A BlobRef is used to refer to a blob in BlobStore. Clients may only manipulate blobs through BlobRefs. BlobRefs should not be sent in the clear outside of Google (for example, encoded in URLs, stored in a client cookie, or referred to in Javascript); for efficiency, the IDs expose internal details of the blobstore (such as machine IPs or cluster names). If clients need to store BlobRefs outside of Google, they must encrypt the BlobRef securely or use an alternative insecure identifier with an id->BlobRef mapping inside our network.

Resolved url and site spamscore for outlinks in updates (aka microposts).