gistfile1.txt

shard01:PRIMARY> c = db.oplog.rs.find( { fromMigrate : { $exists : false } } ).addOption(  DBQuery.Option.tailable ).addOption(DBQuery.Option.awaitData)
{ "ts" : Timestamp(1422998530, 1), "h" : NumberLong(0), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "initiating set" } }
{ "ts" : Timestamp(1422998574, 1), "h" : NumberLong("-6781014703318499311"), "v" : 2, "op" : "i", "ns" : "test.mycollection", "o" : { "_id" : 1, "data" : "hello" } }
{ "ts" : Timestamp(1422998579, 1), "h" : NumberLong("-217362260421471244"), "v" : 2, "op" : "i", "ns" : "test.mycollection", "o" : { "_id" : 3, "data" : "hello" } }
{ "ts" : Timestamp(1422998584, 1), "h" : NumberLong("7215322058367374253"), "v" : 2, "op" : "i", "ns" : "test.mycollection", "o" : { "_id" : 5, "data" : "hello" } }
shard01:PRIMARY> c.hasNext()
true
shard01:PRIMARY> c.next()
{
	"ts" : Timestamp(1423049506, 1),
	"h" : NumberLong("5775895302295493166"),
	"v" : 2,
	"op" : "i",
	"ns" : "test.mycollection",
	"o" : {
		"_id" : 12,
		"data" : "hello"
	}
}
shard01:PRIMARY> c.hasNext()
false