Write a NoSQL field backend
completed by: dmitrig01
mentors: Karoly Negyesi
Drupal 7 field API allows entrying, storing, retrieving and displaying structured arbitrary data. SQL is not the best match for this so it's underlying storage layer was designed with NoSQL data stores in mind. Implement the field storage engine hooks for Apache Cassandra or Riak allowing Drupal to store in either. Note that EntityFieldQuery does not mandate any operation to work.
The deliverable is a module that passes FieldAttachStorageTestCase with the default storage engine set to something else but field_sql_storage.
Your resources are the field_sql_storage.module in core and the mongodb field storage engine from http://drupal.org/project/mongodb