vert.x cluster shared data not working

Node1

$ vertx run test.js -cluster
Starting clustering...
No cluster-host specified so using address 192.168.1.11
1.0

Node2

$ vertx run test.js -cluster
Starting clustering...
No cluster-host specified so using address 192.168.1.10
Prefer IPv4 stack is true.
Picked Address[192.168.1.10]:5701, using socket ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5701], bind any local is true
[192.168.1.10]:5701 [dev] Hazelcast Community Edition 2.5.1 (20130427) starting at Address[192.168.1.10]:5701
[192.168.1.10]:5701 [dev] Copyright (C) 2008-2013 Hazelcast.com
[192.168.1.10]:5701 [dev] Address[192.168.1.10]:5701 is STARTING
[192.168.1.10]:5701 [dev] Connecting to master node: Address[192.168.1.11]:5701
[192.168.1.10]:5701 [dev] 53264 accepted socket connection from /192.168.1.11:5701
[192.168.1.10]:5701 [dev]

Members [2] {
  Member [192.168.1.11]:5701
	Member [192.168.1.10]:5701 this
}

[192.168.1.10]:5701 [dev] Address[192.168.1.10]:5701 is STARTED
1.0

output

Both nodes output is "1.0"

test.js

hared_data = require('shared_data');
console = require('console');

map = shared_data.getMap('testmap');

tstamp = new Date();
map.put(tstamp.getTime(), 'hello');

console.log(map.size());