Hi, a sharding cluster has two shard groups:

shards:

{ "_id" : "shard1", "host" : "shard1/10.136.16.67:27032,10.136.16.68:27032" } { "_id" : "shard2", "host" : "shard2/10.136.16.69:27032,10.136.16.70:27032" }

The shard shard1 is consisted by three nodes: two mongod nodes and a arbiter node. Then, a new secondary nodes was added. Like below.

shard1:
PRIMARY> rs.config()
{
"_id" : "youninameshard1",
"version" : 3,
"members" : [

{ "_id" : 0, "host" : "10.136.16.67:27032", "priority" : 2 }

,

{ "_id" : 1, "host" : "10.136.16.68:27032" }

,

{ "_id" : 2, "host" : "10.136.16.68:37032", "arbiterOnly" : true }

,

{ "_id" : 3, "host" : "10.136.16.73:27032" }

]
}

Now, how to add the member 3 node into the shard shard1?