HDFS NameNode 和 DataNode 未根据 DFS.REPLICATION 值启动

Question

由于我正处于Hadoop的学习阶段，我在Hadoop单集群设置方面遇到了问题。我正在使用Hadoop 2.9.0和Java 8。我已经完成了设置，如下所示

核心站点.xml

<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/ubuntu/hadooptmp/hadoop-${user.name}</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>

地图网站.xml

<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>localhost:9001</value>
</property>
</configuration>

纱线站点.xml

<configuration>
<!-- Site specific YARN configuration properties -->
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
</configuration>

HDFS-site.xml

<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property><name>dfs.name.dir</name>
<value>file:///home/ubuntu/hadoop/hdfs/namenode</value>
<final>true</final>
</property>
<property>
<name>dfs.data.dir</name>
<value>file:///home/ubuntu/hadoop/hdfs/datanode</value>
<final>true</final>
</property>
</configuration>

现在 hdfs-site.xml 中 dfs.replication 的值是 1。现在我正在做 start-all.sh，如果我检查状态 -

7536 ResourceManager
7025 NameNode
7378 SecondaryNameNode
8147 Jps
7667 NodeManager

现在我有 stop-all.sh，如果我将 hdfs-.xml site 中 dfs.replication 的值更改为 0(有些人提到这是解决方案(，然后再次 start-all.sh。状态是 -

9024 DataNode
9362 ResourceManager
9493 NodeManager
9815 Jps

正如我们所看到的，在这种情况下，名称节点停止运行。我尝试过格式化两者，但没有成功。我不明白我在设置中做错了什么，无法同时运行Namenode和数据节点。

我已经在 aws ubuntu 服务器上完成了所有单个集群设置。我尝试在mapred-site中给出 mapreduce.framework.name 的价值.xml作为"纱线"，但没有帮助。 如果有解决方案，请告诉我。

下面添加了数据节点日志

2018-08-23 15:08:14,494 INFO org.apache.hadoop.hdfs.server.common.Storage: Using 1 threads to upgrade data directories (dfs.datanode.parallel.volumes.load.threads.num=1, dataDirs=1)
2018-08-23 15:08:14,506 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /home/ubuntu/hadoop/hdfs/datanode/in_use.lock acquired by nodename [e-mail]
2018-08-23 15:08:14,509 WARN org.apache.hadoop.hdfs.server.common.Storage: Failed to add storage directory [DISK]file:/home/ubuntu/hadoop/hdfs/datanode/
java.io.IOException: Incompatible clusterIDs in /home/ubuntu/hadoop/hdfs/datanode: namenode clusterID = CID-e5d9317d-7c4d-40eb-8fa2-030c5a8cfad6; datanode clusterID = CID-f416763a-ed6f-41d7-8b9d-12c298c5d779
at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:760)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.loadStorageDirectory(DataStorage.java:293)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.loadDataStorage(DataStorage.java:409)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.addStorageLocations(DataStorage.java:388)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:556)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1649)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1610)
at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:374)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:280)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:816)
at java.lang.Thread.run(Thread.java:748)
2018-08-23 15:08:14,516 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for Block pool <registering> (Datanode Uuid 85d94537-7ccc-4d7d-aa2c-48c65a453399) service to localhost/127.0.0.1:9000. Exiting.
java.io.IOException: All specified directories have failed to load.
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:557)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1649)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1610)
at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:374)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:280)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:816)
at java.lang.Thread.run(Thread.java:748)
2018-08-23 15:08:14,516 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool <registering> (Datanode Uuid 85d94537-7ccc-4d7d-aa2c-48c65a453399) service to localhost/127.0.0.1:9000
2018-08-23 15:08:14,518 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Removed Block pool <registering> (Datanode Uuid 85d94537-7ccc-4d7d-aa2c-48c65a453399)
2018-08-23 15:08:16,520 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
2018-08-23 15:08:16,531 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at ip-172-31-29-76.us-east-2.compute.internal/172.31.29.76

Answer 1

我认为问题是名称节点和数据节点的集群ID之间的冲突。我运行了一个命令">sudo rm -rf/home/ubuntu/hadoop/hdfs/datanode/*"，它解决了现在Namenode和数据节点都在运行的问题。

4632 NameNode
4793 DataNode
5145 ResourceManager
5531 Jps
5276 NodeManager
4989 SecondaryNameNode

感谢您的帮助。如果我错过了什么，请告诉我。