Hello, We are trying to deploy our app on AWS. We are running a replica set configuration with 2 data nodes and 1 arbiter. Same configuration works fine on local environment but throws following exception on AWS

com.mongodb.MongoException: can't find a master
com.mongodb.DBTCPConnector.checkMaster(DBTCPConnector.java:434)
com.mongodb.DBTCPConnector.call(DBTCPConnector.java:209)
com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:305)
com.mongodb.DBCollection.findOne(DBCollection.java:647)
com.mongodb.DBCollection.findOne(DBCollection.java:626)
com.mongodb.DBApiLayer$MyCollection.createIndex(DBApiLayer.java:364)
com.mongodb.DBCollection.createIndex(DBCollection.java:436)
com.mongodb.DBCollection.ensureIndex(DBCollection.java:515)
com.google.code.morphia.DatastoreImpl.ensureIndex(DatastoreImpl.java:245)
com.google.code.morphia.DatastoreImpl.ensureIndexes(DatastoreImpl.java:310)
com.google.code.morphia.DatastoreImpl.ensureIndexes(DatastoreImpl.java:279)
com.google.code.morphia.DatastoreImpl.ensureIndexes(DatastoreImpl.java:340)
com.google.code.morphia.DatastoreImpl.ensureIndexes(DatastoreImpl.java:333)
com.intuit.spark.MongoConnectionManager.<init>(MongoConnectionManager.java:37)

Here is the config of replia set
PRIMARY> rs.config()
{
"_id" : "sparkReplicaSet",
"version" : 5,
"members" : [

{ "_id" : 0, "host" : "ip-10-46-223-117:27017" }

,

{ "_id" : 1, "host" : "ip-10-46-167-177.ec2.internal:27017" }

,

{ "_id" : 2, "host" : "domU-12-31-39-04-D6-95.compute-1.internal:27017", "arbiterOnly" : true }

]
}

I have installed mongo shell on the app server(TOMCAT) host and I am able to connect to PRIMARY via the shell, that rules out networking issue.

The code which gets the connection string is as follows
List<ServerAddress> addrs = getMongoAddress();
m = new Mongo(addrs);
morphia = new Morphia();

addrs List is created using
ec2-23-22-74-137.compute-1.amazonaws.com:27017
ec2-23-23-87-249.compute-1.amazonaws.com:27017
ec2-23-22-156-48.compute-1.amazonaws.com:27017

What are we missing in all this? Same code works on 3 node replica set on local machine. Here is config from my local setup
PRIMARY> rs.config()
{
"_id" : "sparkdb",
"version" : 3,
"members" : [

{ "_id" : 0, "host" : "MPKL09407ef8d.local:27017" }

,

{ "_id" : 1, "host" : "MPKL09407ef8d.local:27088" }

,

{ "_id" : 2, "host" : "MPKL09407ef8d.local:27098" }

]
}

Thanks
Sankate