设置数据节点时Hadoop中的特权操作异常？

Question

我在我的mac OS X中设置了hadoop框架。使用virtualbox，我安装了ubuntu服务器（一个nameNode）和另外两个ubuntu服务器作为datanode。 我已经根据我的知识正确设置了core-site.xml和其他配置。当我使用start-all.sh启动框架时，一切似乎都很好。在NameNode上执行jps，每个数据节点都显示该进程处于活动状态。但是在GUI网址上，我看到没有节点存在。看附图。 以下是来自日志文件的错误消息：

2014-06-23 18:00:01,167 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Web-server up at: 0.0.0.0:50070
2014-06-23 18:00:01,174 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting
2014-06-23 18:00:01,175 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 10001: starting
2014-06-23 18:00:01,178 INFO org.apache.hadoop.ipc.Server: IPC Server handler 0 on 10001: starting
2014-06-23 18:00:01,186 INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 10001: starting
2014-06-23 18:00:01,190 INFO org.apache.hadoop.ipc.Server: IPC Server handler 2 on 10001: starting
2014-06-23 18:00:01,195 INFO org.apache.hadoop.ipc.Server: IPC Server handler 3 on 10001: starting
2014-06-23 18:00:01,195 INFO org.apache.hadoop.ipc.Server: IPC Server handler 4 on 10001: starting
2014-06-23 18:00:01,196 INFO org.apache.hadoop.ipc.Server: IPC Server handler 5 on 10001: starting
2014-06-23 18:00:01,198 INFO org.apache.hadoop.ipc.Server: IPC Server handler 6 on 10001: starting
2014-06-23 18:00:01,201 INFO org.apache.hadoop.ipc.Server: IPC Server handler 7 on 10001: starting
2014-06-23 18:00:01,206 INFO org.apache.hadoop.ipc.Server: IPC Server handler 8 on 10001: starting
2014-06-23 18:00:01,213 INFO org.apache.hadoop.ipc.Server: IPC Server handler 9 on 10001: starting
2014-06-23 18:00:05,692 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:sridhar cause:java.io.IOException: File /usr/local/hadoop/tmp/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
2014-06-23 18:00:05,692 INFO org.apache.hadoop.ipc.Server: IPC Server handler 4 on 10001, call addBlock(/usr/local/hadoop/tmp/mapred/system/jobtracker.info, DFSClient_NONMAPREDUCE_1288778011_1, null) from 127.0.0.1:56524: error: java.io.IOException: File /usr/local/hadoop/tmp/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
java.io.IOException: File /usr/local/hadoop/tmp/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1920)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:783)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1432)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1428)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1426)
2014-06-23 18:00:06,716 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:sridhar cause:java.io.IOException: File /usr/local/hadoop/tmp/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
2014-06-23 18:00:06,716 INFO org.apache.hadoop.ipc.Server: IPC Server handler 0 on 10001, call addBlock(/usr/local/hadoop/tmp/mapred/system/jobtracker.info, DFSClient_NONMAPREDUCE_1288778011_1, null) from 127.0.0.1:56524: error: java.io.IOException: File /usr/local/hadoop/tmp/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1

PS：我确实在寻找其他显示类似错误的帖子。我试过了。但没有成功

编辑：

namenode服务器在发出jps命令时不显示datanode和tasktracker。 datanode上的日志如下所示:(可能datanode没有建立连接）

2014-06-23 17:14:16,003 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: ubuntuhadoop/69.91.135.178:10001. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 2014-06-23 17:14:17,005 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: ubuntuhadoop/69.91.135.178:10001. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 2014-06-23 17:14:18,006 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: ubuntuhadoop/69.91.135.178:10001. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

Answer 1

我让这个工作。虽然解决方案是微不足道的，但我想在此发布，以便其他新手Hadoopers可能会受益。

1）在主（core-site.xml）和所有从属（hdfs-site.xml）中都拥有mapred-site.xml，nameNode和dataNodes的完全副本。我认为高手中的core-site.xml和mapred-site.xml并不重要。但它是。他们打开他们听的端口。在这些端口上，dataNode可以达到nameNode。

2）当您在master上运行jps时，您将看不到DataNodes和TaskTracker的进程（至少我没有看到），假设您执行了start-all.sh主。原因是因为DataNodes和TaskTrackers线程在集群的不同节点上处理（在我的例子中，我有一个ubuntu盒作为主节点，两个ubuntu盒作为datanode）。

注意：在我的情况下，我没有让我的主人充当datanode（即作为奴隶）

Answer 2

从日志中可以看出，您的主节点无法连接其中一个数据节点（ubuntuhadoop / 69.91.135.178：10001）。

作为初始测试，请从主服务器ssh到数据节点，看看是否可以连接它。 以下链接可能有助于设置群集!!

http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/