synchronization web service methodologies or papers

Posted by Grady Player on Programmers See other posts from Programmers or by Grady Player
Published on 2011-07-20T20:30:13Z Indexed on 2011/11/24 10:20 UTC
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I am building a web service (PHP+JSON) to sync with my iphone app. The main goals are:

  1. Backup
  2. Provide a web view for printing / sorting, manipulating.
  3. allow a group sync up and down.

I am aware of the logic problems with all of these items, Ie. if one person deletes something, do you persist this change to other users, collisions, etc.

I am looking for just any book or scholarly work, or even words of wisdom to address common issues.

  • when to detect changes of data with hashes, vs modified dates, or combination.
  • how do address consolidation of sequential ID's originating on different client nodes (can be sidestepped in my context, but it would be interesting.)
  • dealing with collisions (is there a universally safe way to do so?).
  • general best practices.
  • how to structure the actual data transaction (ask for whole list then detect changes...)

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