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org.apache.hadoop.ipc.RemoteException: Server IPC version 7 cannot 
communicate with client version 4	at org.apache.hadoop.ipc.Client.call(Client.java:1107)	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)	at sun.proxy.$Proxy5.getProtocolVersion(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:616)	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85)	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62)	at sun.proxy.$Proxy5.getProtocolVersion(Unknown Source)	at org.apache.hadoop.ipc.RPC.checkVersion(RPC.java:422)	at org.apache.hadoop.hdfs.DFSClient.createNamenode(DFSClient.java:183)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:281)	at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:245)	at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:100)	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1437)	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1455)	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:123)	at org.apache.hama.bsp.BSPMaster.(BSPMaster.java:317)	at org.apache.hama.bsp.BSPMaster.startMaster(BSPMaster.java:489)	at org.apache.hama.bsp.BSPMaster.startMaster(BSPMaster.java:475)	at org.apache.hama.BSPMasterRunner.run(BSPMasterRunner.java:46)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)	at org.apache.hama.BSPMasterRunner.main(BSPMasterRunner.java:56)