java.net.ConnectException: Connection refused

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java.net.ConnectException: Connection refused	at java.net.PlainSocketImpl.socketConnect(Native Method)	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)	at java.net.Socket.connect(Socket.java:589)	at org.apache.giraph.zk.ZooKeeperManager.onlineZooKeeperServers(ZooKeeperManager.java:701)	at org.apache.giraph.graph.GraphTaskManager.startZooKeeperManager(GraphTaskManager.java:357)	at org.apache.giraph.graph.GraphTaskManager.setup(GraphTaskManager.java:188)	at org.apache.giraph.graph.GraphMapper.setup(GraphMapper.java:60)	at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:90)	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)	at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:223)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)