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Common thrift types
GFS uses several thrift datastructures which are common to multiple queries. They are listed below.
EdgeType
EdgeType is a thrift enum which specifies which edge types to query for the graph.
enum EdgeType {
FOLLOWING,
FOLLOWED_BY,
FAVORITE,
FAVORITED_BY,
RETWEET,
RETWEETED_BY,
REPLY,
REPLYED_BY,
MENTION,
MENTIONED_BY,
MUTUAL_FOLLOW,
SIMILAR_TO, // more edge types (like block, report, etc.) can be supported later.
RESERVED_12,
RESERVED_13,
RESERVED_14,
RESERVED_15,
RESERVED_16,
RESERVED_17,
RESERVED_18,
RESERVED_19,
RESERVED_20
}
For an example of how this is used, consider the GetNeighbors query. If we set the edgeType field
of the GfsNeighborsRequest, the response will contain all the users that the specified user follows.
If, on the other hand, we set edgeType to be FollowedBy it will return all the users who are
followed by the specified user.
FeatureType
FeatureType is a thrift struct which is used in queries which require two edge types.
struct FeatureType {
1: required EdgeType leftEdgeType // edge type from source user
2: required EdgeType rightEdgeType // edge type from candidate user
}(persisted="true")
UserWithScore
The candidate generation queries return lists of candidates together with a computed score for the
relevant feature. UserWithScore is a thrift struct which bundles together a candidate's ID with
the score.
struct UserWithScore {
1: required i64 userId
2: required double score
}