Simon Willison’s Weblog

Amazon S3: Versioning Proposal. The us-west-1 S3 bucket region now optionally supports versioning—once enabled on a bucket, all previous versions of keys will be preserved. 24th January 2010, 1:38 pm

Semantic Versioning. Tom Preston-Werner provides a name, specification and URL describing the relatively widely used Major.Minor.Patch versioning system. This is really useful—by giving something a name and a spec, people can say “this project uses semantic versioning” and skip having to explain their backwards compatibility policy in full. 15th December 2009, 9:53 pm

Project Voldemort. Yet Another “big, distributed, persistent, fault-tolerant hash table”—this time from LinkedIn, released under the Apache 2.0 license. The approach to consistency is interesting—instead of using distributed transactions, they use versioning and “resolve inconsistencies at read time”. It also uses consistent hashing (as seen in libketama) to select servers. The design document has lots more information. 17th January 2009, 7:45 pm

Versioning REST Web Services. Peter Williams suggests using a vendor MIME media type in the Accept header to specify a required API version, because embedding the API version in the URL itself leads to a single resource ending up with many different URLs, one for each API version. 13th October 2008, 12:45 pm