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hadoop jar hadoop-mapreduce-examples-2.6.0-cdh5.15.1.jar pi 2 3

执行这个命令就报
Number of Maps = 2
Samples per Map = 3
19/08/29 11:05:39 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable
java.net.ConnectException: Call From iz2zef2y4ij2cmapfgykw2z/172.17.149.29 to iz2zef2y4ij2cmapfgykw2z:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:791)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:731)
at org.apache.hadoop.ipc.Client.call(Client.java:1508)
at org.apache.hadoop.ipc.Client.call(Client.java:1441)
at org.apache.hadoop.ipc.ProtobufRpcEngine $I n v o k e r . i n v o k e (P r o t o b u f R p c E n g i n e . j a v a : 230) a t c o m . s u n . p r o x y .$ Proxy10.getFileInfo(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:788)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:258)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104)
at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)
at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2168)
at org.apache.hadoop.hdfs.DistributedFileSystem$20.doCall(DistributedFileSystem.java:1266)
at org.apache.hadoop.hdfs.DistributedFileSystem $20 . d o C a l l (D i s t r i b u t e d F i l e S y s t e m . j a v a : 1262) a t o r g . a p a c h e . h a d o o p . f s . F i l e S y s t e m L i n k R e s o l v e r . r e s o l v e (F i l e S y s t e m L i n k R e s o l v e r . j a v a : 81) a t o r g . a p a c h e . h a d o o p . h d f s . D i s t r i b u t e d F i l e S y s t e m . g e t F i l e S t a t u s (D i s t r i b u t e d F i l e S y s t e m . j a v a : 1262) a t o r g . a p a c h e . h a d o o p . f s . F i l e S y s t e m . e x i s t s (F i l e S y s t e m . j a v a : 1418) a t o r g . a p a c h e . h a d o o p . e x a m p l e s . Q u a s i M o n t e C a r l o . e s t i m a t e P i (Q u a s i M o n t e C a r l o . j a v a : 278) a t o r g . a p a c h e . h a d o o p . e x a m p l e s . Q u a s i M o n t e C a r l o . r u n (Q u a s i M o n t e C a r l o . j a v a : 354) a t o r g . a p a c h e . h a d o o p . u t i l . T o o l R u n n e r . r u n (T o o l R u n n e r . j a v a : 70) a t o r g . a p a c h e . h a d o o p . e x a m p l e s . Q u a s i M o n t e C a r l o . m a i n (Q u a s i M o n t e C a r l o . j a v a : 363) a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 (N a t i v e M e t h o d) a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e (N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 62) a t s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e (D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43) a t j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e (M e t h o d . j a v a : 498) a t o r g . a p a c h e . h a d o o p . u t i l . P r o g r a m D r i v e r$ ProgramDescription.invoke(ProgramDriver.java:71)
at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.run(RunJar.java:226)
at org.apache.hadoop.util.RunJar.main(RunJar.java:141)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:530)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:494)
at org.apache.hadoop.ipc.Client $C o n n e c t i o n . s e t u p C o n n e c t i o n (C l i e n t . j a v a : 648) a t o r g . a p a c h e . h a d o o p . i p c . C l i e n t$ Connection.setupIOstreams(Client.java:744)
at org.apache.hadoop.ipc.Client$Connection.access$3000(Client.java:396)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1557)
at org.apache.hadoop.ipc.Client.call(Client.java:1480)
… 34 more
而且执行命令后 jps 之后 namenode 这个进程不见了 20241 NodeManager
20146 ResourceManager
21572 Jps
19993 SecondaryNameNode
19834 DataNode
20778 MRAppMaste