mongoDB servers are not available when the master is down - mongodb

Question

Once I turn off the master node, the other nodes are down, too.
I can NOT get data from other nodes (if the master is down/off )
The following errors happends when the master replica is down
ConnectionPool::PoolShuttingDownError (ConnectionPool::PoolShuttingDownError):
Moped::Errors::ConnectionFailure (Could not connect to a primary node for replica set #<Moped::Cluster:70117691586500 #seeds=[<Moped::Node resolved_address="0.0.0.0:27017">]>
I have 3 mongoDB replicas.
It seems the primary replica is 172.19.16.109:27017
I don't understand why I shutdown the machine 172.19.16.109,
And remaining 2 replicas are unavailable to load data from its database.
Is it not making sense for the replicas ? Once if the master is shutdown, the others are also unavailable, too.
I expect that even if any replica is down, the others should work correctly.
My configurations are as below.
vvtk_dqa:PRIMARY> rs.conf()
{
"_id" : "vvtk_dqa",
"version" : 4,
"members" : [
{
"_id" : 1,
"host" : "172.19.16.109:27017"
},
{
"_id" : 2,
"host" : "172.19.16.104:27017"
},
{
"_id" : 3,
"host" : "192.168.14.7:27017"
}
]
}
mongodb.conf
# Where to store the data.
dbpath=/var/lib/mongodb
#where to log
logpath=/var/log/mongodb/mongodb.log
logappend=true
bind_ip = 0.0.0.0
#port = 27017
# Enable journaling, http://www.mongodb.org/display/DOCS/Journaling
journal=true
replSet=vvtk_dqa
isMaster
vvtk_dqa:PRIMARY> rs.isMaster()
{
"setName" : "vvtk_dqa",
"setVersion" : 4,
"ismaster" : true,
"secondary" : false,
"hosts" : [
"172.19.16.109:27017",
"192.168.14.7:27017",
"172.19.16.104:27017"
],
"primary" : "172.19.16.109:27017",
"me" : "172.19.16.109:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2015-02-11T02:05:12.021Z"),
"maxWireVersion" : 2,
"minWireVersion" : 0,
"ok" : 1
}
After I shutdown the 172.19.16.109, and type rs.status() on 192.168.14.7
and still can not get any data from 192.168.14.7 or 172.19.16.104
vvtk_dxa:PRIMARY> rs.status()
{
"set" : "vvtk_dqa",
"date" : ISODate("2015-02-12T01:51:37Z"),
"myState" : 1,
"members" : [
{
"_id" : 1,
"name" : "172.19.16.109:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : Timestamp(1423649845, 1),
"optimeDate" : ISODate("2015-02-11T10:17:25Z"),
"lastHeartbeat" : ISODate("2015-02-12T01:51:28Z"),
"lastHeartbeatRecv" : ISODate("2015-02-11T10:31:04Z"),
"pingMs" : 0,
"syncingTo" : "192.168.14.7:27017"
},
{
"_id" : 2,
"name" : "172.19.16.104:27017",
"health" : 1,
"state" : 4,
"stateStr" : "FATAL",
"uptime" : 64832,
"optime" : Timestamp(1423545748, 1),
"optimeDate" : ISODate("2015-02-10T05:22:28Z"),
"lastHeartbeat" : ISODate("2015-02-12T01:51:37Z"),
"lastHeartbeatRecv" : ISODate("2015-02-12T01:51:35Z"),
"pingMs" : 0
},
{
"_id" : 3,
"name" : "192.168.14.7:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 64835,
"optime" : Timestamp(1423704914, 1),
"optimeDate" : ISODate("2015-02-12T01:35:14Z"),
"self" : true
}
],
"ok" : 1
}