Unknown protocol to name node: org.apache.hadoop.mapred.JobSubmissionProtocol

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Cannot connect to the Map/Reduce location: hadoop
java.io.IOException: Unknown protocol to name node: org.apache.hadoop.mapred.JobSubmissionProtocol
at org.apache.hadoop.hdfs.server.namenode.NameNode.getProtocolVersion(NameNode.java:152)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:578)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1393)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1389)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)

at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1387)

记录一下，解决方法是：mapreduce的jobtracker和namenode端口配置错误了

Map/Reduce Master

Host:192.168.10.125

Port:9101

DFS Master

Host:192.168.10.125

Port:9100

User name:root(是linux的用户名)