Question

我正在尝试安装RMR（RHadoop）软件包，但我设法弄乱了我的hadoop设置。现在，它给出了连接拒绝错误，我无法找到解决方案。任何帮助，将不胜感激。感谢

 java.net.ConnectException: Call to master/***.***.***.***:54310 failed on connection exception: java.net.ConnectException: Connection refused
at org.apache.hadoop.ipc.Client.wrapException(Client.java:1095)
at org.apache.hadoop.ipc.Client.call(Client.java:1071)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
at $Proxy2.getProtocolVersion(Unknown Source)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)
at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:119)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:238)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:203)
at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:123)
at org.apache.hadoop.mapred.Child$4.run(Child.java:254)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)
at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434)
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560)
at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1202)
at org.apache.hadoop.ipc.Client.call(Client.java:1046)
... 18 more

Answer 1

当您看到这一点时，它基本上意味着您无法连接到NameNode。它不是在不同的端口上运行或运行。如果您备份了正在运行的* -site.xml文件，那么您可以返回到工作版本，而无需在您的问题的评论中完全重新安装。

Answer 2

我已经挣扎了两天两夜，找出了这个问题的答案。

在我的情况下（我确定这是大多数情况下的问题）必须手动创建hadoop临时文件夹并将它们添加到hdfs-site.xml！

<property>
<name>dfs.data.dir</name>
<value>/home/stefan/Downloads/hadoop-2.7.1/tmp/dfs/name/data</value>
<final>true</final> 
</property> 
<property> 
<name>dfs.name.dir</name>
<value>/home/stefan/Downloads/hadoop-2.7.1/tmp/dfs/name</value> 
<final>true</final> 
</property>

我希望这可以帮助你们不要像我一样经历同样的痛苦。

除此之外

chown user_name hadoop_folder hadoop_temp_folder
chmod 755 hadoop_folder hadoop_temp_folder

Hadoop连接拒绝错误

2 个答案: