未启动数据节点

Question

我正尝试使用以下指南在伪分布式配置中设置Hadoop 0.20.203.0版本：

http://www.javacodegeeks.com/2012/01/hadoop-modes-explained-standalone.html

运行start-all.sh脚本后，运行“jps”。

4825 NameNode
5391 TaskTracker
5242 JobTracker
5477 Jps
5140 SecondaryNameNode

bin/hadoop fs -put conf input

我有个错误：

hadoop@m1a2:~/software/hadoop$ bin/hadoop fs -put conf input
12/04/10 18:15:31 WARN hdfs.DFSClient: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/input/core-site.xml could only be replicated to 0 nodes, instead of 1
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:416)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)

        at org.apache.hadoop.ipc.Client.call(Client.java:1030)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:224)
        at $Proxy1.addBlock(Unknown Source)
        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:616)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
        at $Proxy1.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3104)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2975)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2255)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2446)

12/04/10 18:15:31 WARN hdfs.DFSClient: Error Recovery for block null bad datanode[0] nodes == null
12/04/10 18:15:31 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/hadoop/input/core-site.xml" - Aborting...
put: java.io.IOException: File /user/hadoop/input/core-site.xml could only be replicated to 0 nodes, instead of 1
12/04/10 18:15:31 ERROR hdfs.DFSClient: Exception closing file /user/hadoop/input/core-site.xml : org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/input/core-site.xml could only be replicated to 0 nodes, instead of 1
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:416)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)

org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/input/core-site.xml could only be replicated to 0 nodes, instead of 1
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:416)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)

        at org.apache.hadoop.ipc.Client.call(Client.java:1030)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:224)
        at $Proxy1.addBlock(Unknown Source)
        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:616)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
        at $Proxy1.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3104)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2975)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2255)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2446)

我不完全确定，但我相信这可能与datanode没有运行有关。

有谁知道我做错了什么，或者怎么解决这个问题吗？

编辑：这是datanode.log文件：

2012-04-11 12:27:28,977 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = m1a2/139.147.5.55
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 0.20.203.0
STARTUP_MSG:   build = http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-203 -r 1099333; compiled by 'oom' on Wed May  4 07:57:50 PDT 2011
************************************************************/
2012-04-11 12:27:29,166 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2012-04-11 12:27:29,181 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2012-04-11 12:27:29,183 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2012-04-11 12:27:29,183 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2012-04-11 12:27:29,342 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2012-04-11 12:27:29,347 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!
2012-04-11 12:27:29,615 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /tmp/hadoop-hadoop/dfs/data: namenode namespaceID = 301052954; datanode namespaceID = 229562149
        at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:232)
        at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:147)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:354)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:268)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1480)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1419)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1437)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1563)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1573)

2012-04-11 12:27:29,617 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at m1a2/139.147.5.55
************************************************************/

Answer 1

您在DN日志中得到的错误描述如下：http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/#java-io-ioexception-incompatible-namespaceids

从那一页：

目前，似乎有两个变通办法，如下所述。

我可以证明以下步骤解决了这个错误，但副作用不会让你高兴（我也是）。我找到的简陋的解决办法是：

1. 停止群集
2. 删除有问题的数据阳极上的数据目录：该目录由conf/hdfs-site.xml中的dfs.data.dir指定；如果您遵循了本教程，则相关目录为/app/hadoop/tmp/dfs/data
3. 重新格式化NameNode（注意：在此过程中所有HDFS数据都丢失了！）
4. 重新启动群集

当删除所有HDFS数据并从头开始听起来不是一个好主意时（在最初的设置/测试中可能没问题），您可以尝试第二种方法。

非常感谢Jared Stehler提出的以下建议。我自己还没有测试过，但请随时试用，并将您的反馈发送给我。这种变通方法是“微创”的，因为您只需在有问题的数据阳极上编辑一个文件：

1. 停止DataNode
2. 编辑/current/version中namespaceID的值以匹配当前namenode的值
3. 重新启动DataNode

如果您按照我的教程中的说明操作，相关文件的完整路径如下：

nameNode：/app/Hadoop/tmp/dfs/name/current/version

在本教程中使用/app/hadoop/tmp）。

如果你想知道版本的内容是什么样子的，下面是我的一个：

#/当前/版本的内容