com.twitter.summingbird.scalding.service
A UniqueKeyedService covers the case where Keys are globally unique and either are not present or have one value. Examples could be Keys which are Unique IDs, such as UserIDs, content IDs, cryptographic hashes, etc...
Load the range of data to do a join
Return the maximum subset of the requested range that can be handled
You can override this to use hashJoin for instance
A UniqueKeyedService covers the case where Keys are globally unique and either are not present or have one value. Examples could be Keys which are Unique IDs, such as UserIDs, content IDs, cryptographic hashes, etc...