Avro is interesting but it is VERY complex. The schema negotiation is something I never felt comfortable with in an RPC context. You want something simple, and therefore bug free. This is why we like HTTP and JSON.
My vote goes for Thrift, but there are some features of protobuf which are interesting, notably the APIs for dealing with messages you dont know everything about, and ways to preserve unknown fields when you copy messages from A->B, this is in part how dapper works.
My vote goes for Thrift, but there are some features of protobuf which are interesting, notably the APIs for dealing with messages you dont know everything about, and ways to preserve unknown fields when you copy messages from A->B, this is in part how dapper works.