Locking with S3

Question

What\'s the recommended way to implement a simple locking mechanism to be used in conjunction with S3?

Example of what I want to do:

• acquire lock by ob

Answer 1

i dont think that you can do this using S3 only, using simpleDB's consistency enhancements as james said is a good way that works

you can look for some examples here : Amazon SimpleDB Consistency Enhancements

another approach that might be fine is using the versioning feature of S3
so basically, store an object id/version id pair in simpleDB as the most "valid" version
and assure that all GET requests will retrieve that version
after a successful PUT of a modified object, update the version id in the DB

this way you could also use the ability to retrieve previous versions of an object for restoring if needed.