Datanode未正确启动

Question

我试图以伪分布式模式安装Hadoop2.2.0。当我试图启动datanode服务时，它显示了以下错误，请告诉我如何解决这个问题吗？

**2**014-03-11 08:48:15,916 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Block pool <registering> (storage id unknown) service to localhost/127.0.0.1:9000 starting to offer service
2014-03-11 08:48:15,922 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting
2014-03-11 08:48:15,922 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 50020: starting
2014-03-11 08:48:16,406 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /home/prassanna/usr/local/hadoop/yarn_data/hdfs/datanode/in_use.lock acquired by nodename 3627@prassanna-Studio-1558
2014-03-11 08:48:16,426 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool BP-611836968-127.0.1.1-1394507838610 (storage id DS-1960076343-127.0.1.1-50010-1394127604582) service to localhost/127.0.0.1:9000
java.io.IOException: Incompatible clusterIDs in /home/prassanna/usr/local/hadoop/yarn_data/hdfs/datanode: namenode clusterID = CID-fb61aa70-4b15-470e-a1d0-12653e357a10; datanode clusterID = CID-8bf63244-0510-4db6-a949-8f74b50f2be9
    at**** org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:391)
    at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:191)
    at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:219)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:837)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:808)
    at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:280)
    at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:222)
    at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
    at java.lang.Thread.run(Thread.java:662)
2014-03-11 08:48:16,427 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool BP-611836968-127.0.1.1-1394507838610 (storage id DS-1960076343-127.0.1.1-50010-1394127604582) service to localhost/127.0.0.1:9000
2014-03-11 08:48:16,532 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Removed Block pool BP-611836968-127.0.1.1-1394507838610 (storage id DS-1960076343-127.0.1.1-50010-1394127604582)
2014-03-11 08:48:18,532 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
2014-03-11 08:48:18,534 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 0
2014-03-11 08:48:18,536 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: 

Answer 1

您可以执行以下方法，

复制到剪贴板数据节点clusterID中，CID-8bf63244-0510-4db6-a949-8f74b50f2be9

并在HADOOP_HOME/bin目录下运行以下命令

./hdfs namenode -format -clusterId CID-8bf63244-0510-4db6-a949-8f74b50f2be9

然后，这段代码用datanode集群ids格式化namenode。

Answer 2

你必须这样做：

• bin/stop-all.sh
• rm -Rf /home/prassanna/usr/local/hadoop/yarn_data/hdfs/*
• bin/hadoop namenode -format

我也遇到了同样的问题，直到我在本网站中找到了答案。

Answer 3

每当您遇到以下错误时，尝试在从计算机上启动DN：

java.io.IOException: Incompatible clusterIDs in /home/hadoop/dfs/data: namenode clusterID= ****; datanode clusterID = ****

这是因为在您设置集群之后，无论出于什么原因，您都决定重新格式化NN。您在奴隶上的DNs仍然引用旧的NN。

要解决这个问题，只需在本地Linux中删除和重新创建计算机上的数据文件夹，即/home/hadoop/dfs/data。

在机器上重新启动DN的守护进程将重新创建数据/文件夹的内容并解决问题。