图文精华

About云-梭伦科技»专题 › 技术学习(版主发帖区) › 大数据学习 › Hadoop|YARN › 总结型› hadoop编程操作hdfs错误总结
分享

hadoop编程操作hdfs错误总结

admin 2014-2-24 15:42:10 发表于 总结型 [显示全部楼层] 回帖奖励 阅读模式 关闭右栏 0 6871
About云VIP帮助找工作和提升




阅读本文可以带着下面问题：

1.什么情况下会出现连接不上集群，包端口错误？


2.hdfs权限检测在哪里可以配置？如何配置，具体哪个参数？

3.修改完配置文件，运行照样错误？是什么原因造成的？



当我们对hdfs操作的时候，我们可能会碰到如下错误
错误1：权限问题 
  1. Exception in thread "main" org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security.AccessControlException: Permission denied: user=,

  2. access=WRITE, inode="":root:supergroup:rwxr-xr-x

  3.  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

  4.  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

  5.  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

  6.  at java.lang.reflect.Constructor.newInstance(Constructor.java:525)

  7.  at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:95)

  8.  at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:57)

  9.  at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:1216)

  10.  at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:321)

  11.  at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1126)

  12.  at hdfs.hdoopapi.main(hdoopapi.java:19)

  13. Caused by: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.security.AccessControlException: Permission denied: user=hyj, access=WRITE,

  14. inode="":root:supergroup:rwxr-xr-x

  15.  at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:199)

  16.  at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:180)

  17.  at org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:128)

  18.  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:5214)

  19.  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAncestorAccess(FSNamesystem.java:5188)

  20.  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2060)

  21.  at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2029)

  22.  at org.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:817)

  23.  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

  24.  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

  25.  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

  26.  at java.lang.reflect.Method.invoke(Method.java:606)

  27.  at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)

  28.  at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)

  29.  at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)

  30.  at java.security.AccessController.doPrivileged(Native Method)

  31.  at javax.security.auth.Subject.doAs(Subject.java:415)

  32.  at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)

  33.  at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)

  34.  at org.apache.hadoop.ipc.Client.call(Client.java:1070)

  35.  at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)

  36.  at sun.proxy.$Proxy1.mkdirs(Unknown Source)

  37.  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

  38.  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

  39.  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

  40.  at java.lang.reflect.Method.invoke(Method.java:601)

  41.  at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)

  42.  at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)

  43.  at sun.proxy.$Proxy1.mkdirs(Unknown Source)

  44.  at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:1214)

  45.  ... 3 more
复制代码
回答：产生这个错误的原因,是因为HDFS配置文件hdfs-site.xml中，配置了对权限的检查，我们需要把dfs.permissions，value值改为false。
同样友情提醒：改完配置文件，为了保证生效建议重启reboot
  1. <configuration>

  2. <property>

  3. <name>dfs.replication</name>

  4. <value>1</value>

  5. </property>

  6. <property>

  7. <name>hadoop.tmp.dir</name>

  8. <value>/home/work/hadoop_tmp</value>

  9. </property>

  10. <property>

  11. <name>dfs.permissions</name>

  12. <value>true</value>

  13. </property>

  14. </configuration>
复制代码
还存在另外一种情况：如下，就是我们对其配置，这个也会产生这个错误。
  1. <configuration>

  2. <property>

  3. <name>dfs.replication</name>

  4. <value>1</value>

  5. </property>

  6. <property>

  7. <name>hadoop.tmp.dir</name>

  8. <value>/home/work/hadoop_tmp</value>

  9. </property>

  10. </configuration>
复制代码
错误2：端口问题
  1. 14/02/24 14:10:45 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 0 time(s).

  2. 14/02/24 14:10:47 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 1 time(s).

  3. 14/02/24 14:10:49 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 2 time(s).

  4. 14/02/24 14:10:51 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 3 time(s).

  5. 14/02/24 14:10:53 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 4 time(s).

  6. 14/02/24 14:10:55 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 5 time(s).

  7. 14/02/24 14:10:57 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 6 time(s).

  8. 14/02/24 14:10:59 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 7 time(s).

  9. 14/02/24 14:11:01 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 8 time(s).

  10. 14/02/24 14:11:03 INFO ipc.Client: Retrying connect to server: /192.168.159.10:9000. Already tried 9 time(s).

  11. Exception in thread "main" java.net.ConnectException: Call to aboutyun/192.168.159.10:9000 failed on connection exception: java.net.ConnectException: Connection

  12. refused: no further information

  13.  at org.apache.hadoop.ipc.Client.wrapException(Client.java:1099)

  14.  at org.apache.hadoop.ipc.Client.call(Client.java:1075)

  15.  at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)

  16.  at sun.proxy.$Proxy1.getProtocolVersion(Unknown Source)

  17.  at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)

  18.  at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)

  19.  at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:119)

  20.  at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:238)

  21.  at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:203)

  22.  at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)

  23.  at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386)

  24.  at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)

  25.  at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404)

  26.  at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)

  27.  at hdfs.hdoopapi.getFileSystem(hdoopapi.java:29)

  28.  at hdfs.hdoopapi.main(hdoopapi.java:17)

  29. Caused by: java.net.ConnectException: Connection refused: no further information

  30.  at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

  31.  at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692)

  32.  at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)

  33.  at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:489)

  34.  at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434)

  35.  at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560)

  36.  at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)

  37.  at org.apache.hadoop.ipc.Client.getConnection(Client.java:1206)

  38.  at org.apache.hadoop.ipc.Client.call(Client.java:1050)

  39.  ... 14 more
复制代码
上面是的也是错误，看到很多说是修改配置文件，其实发生这个问题的原因
1.你们之间通信确实产生了问题
2.看一下集群是否已经启动（这个很重要）
试一下start-all.sh或许这个就能解决你的问题。
同样友情提醒：改完配置文件，为了保证生效建议重启reboot






来自群组: Hadoop技术组
thread, access
关注公众号，获取大数据、人工智能20套、区块链资源5阶段等资源，随时更新，获取最新技术资源
回复

使用道具 举报

相关帖子

自定义广告语

没找到任何评论，期待你打破沉寂

高级模式
B Color Image Link Quote Code Smilies
您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

发表新帖
admin

管理员

关注

  • 1819

    主题

  • 2045

    帖子

  • 166

    粉丝

TA的主题
关闭

推荐上一条 /2 下一条

关于我们· 联系我们· 加入我们· 小黑屋· 合作伙伴   

Copyright © 2001-2024 About云-梭伦科技 Powered by Discuz! X3.4 Licensed Discuz Team.

简书 / Smrz 京ICP备2020039040号 Wxb 简书网举报电话：021-34700000