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This exception has no message.
java.nio.channels.UnresolvedAddressException: 	at sun.nio.ch.Net.checkAddress(Unknown Source)	at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)	at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:192)	at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:530)	at org.apache.hadoop.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1622)	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1420)	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1373)	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:600)