HDFS连接不上

来源：3-16 HDFS API编程之开发环境搭建

ccmfirst

2021-05-15

命令行可操作，防火墙已关闭
[hadoop@hadoop001 cloudera]$ hadoop fs -copyFromLocal cdh_version.properties /
21/05/15 15:40:53 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable
[hadoop@hadoop001 cloudera]$ hadoop fs -ls /
21/05/15 15:41:11 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable
Found 2 items
-rw-r–r-- 1 hadoop supergroup 1366 2021-05-15 15:17 /README.txt
-rw-r–r-- 1 hadoop supergroup 548 2021-05-15 15:40 /cdh_version.properties
[hadoop@hadoop001 cloudera]$ sudo firewall-cmd --state
[sudo] hadoop 的密码：
not running
[hadoop@hadoop001 cloudera]$ hostname
hadoop001
[hadoop@hadoop001 cloudera]$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 08:00:27:e7:3e:72 brd ff:ff:ff:ff:ff:ff
inet 10.8.11.200/24 brd 10.8.11.255 scope global noprefixroute dynamic enp0s3
valid_lft 43sec preferred_lft 43sec
inet6 fe80::1c96:e2a8:bb57:1267/64 scope link noprefixroute
valid_lft forever preferred_lft forever

HDFS连接报错信息
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread “main” java.net.ConnectException: Call From caicm.local/127.0.0.1 to hadoop001:8020 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.mkdirs(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.mkdirs(ClientNamenodeProtocolTranslatorPB.java:575)
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.mkdirs(Unknown Source)
at org.apache.hadoop.hdfs.DFSClient.primitiveMkdir(DFSClient.java:3155)
at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:3122)
at org.apache.hadoop.hdfs.DistributedFileSystem$19.doCall(DistributedFileSystem.java:1005)
at org.apache.hadoop.hdfs.DistributedFileSystem $19 . d o C a l l (D i s t r i b u t e d F i l e S y s t e m . j a v a : 1001) a t o r g . a p a c h e . h a d o o p . f s . F i l e S y s t e m L i n k R e s o l v e r . r e s o l v e (F i l e S y s t e m L i n k R e s o l v e r . j a v a : 81) a t o r g . a p a c h e . h a d o o p . h d f s . D i s t r i b u t e d F i l e S y s t e m . m k d i r s I n t e r n a l (D i s t r i b u t e d F i l e S y s t e m . j a v a : 1001) a t o r g . a p a c h e . h a d o o p . h d f s . D i s t r i b u t e d F i l e S y s t e m . m k d i r s (D i s t r i b u t e d F i l e S y s t e m . j a v a : 993) a t o r g . a p a c h e . h a d o o p . f s . F i l e S y s t e m . m k d i r s (F i l e S y s t e m . j a v a : 1970) a t h a d o o p . h d f s . H D F S A p p . m a i n (H D F S A p p . j a v a : 21) C a u s e d b y : j a v a . n e t . C o n n e c t E x c e p t i o n : C o n n e c t i o n r e f u s e d a t s u n . n i o . c h . S o c k e t C h a n n e l I m p l . c h e c k C o n n e c t (N a t i v e M e t h o d) a t s u n . n i o . c h . S o c k e t C h a n n e l I m p l . f i n i s h C o n n e c t (S o c k e t C h a n n e l I m p l . j a v a : 715) a t o r g . a p a c h e . h a d o o p . n e t . S o c k e t I O W i t h T i m e o u t . c o n n e c t (S o c k e t I O W i t h T i m e o u t . j a v a : 206) a t o r g . a p a c h e . h a d o o p . n e t . N e t U t i l s . c o n n e c t (N e t U t i l s . j a v a : 530) a t o r g . a p a c h e . h a d o o p . n e t . N e t U t i l s . c o n n e c t (N e t U t i l s . j a v a : 494) a t o r g . a p a c h e . h a d o o p . i p c . C l i e n t$ Connection.setupConnection(Client.java:648)
at org.apache.hadoop.ipc.Client $C o n n e c t i o n . s e t u p I O s t r e a m s (C l i e n t . j a v a : 744) a t o r g . a p a c h e . h a d o o p . i p c . C l i e n t$ Connection.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)
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