- 查看日志:
<span style="font-size:24px;">/home/nbu/xu/hadoop/logs/ vi hadoop-nbu-datanode-hadoop211.log </span>
1、ERROR org.apache.hadoop.hdfs.server.datanode.DataNode:java.io.IOException: Incompatible namespaceIDs in/home/nbu/xu/app/hadoop/tmp/dfs/data: namenode namespaceID = 1284197876;datanode namespaceID = 421089197
说明namespaceIDs不匹配,需要删除临时文件/tmp 路径在core.site.xml中查看
2、ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.net.BindException: Problem binding to /0.0.0.0:50010 : Address already in use
说明一个集群上安装了多个hadoop,端口被占用,因此修改默认端口:修改hdfs-site.xml
<span style="font-size:24px;"><property>
<name>dfs.datanode.address</name>
<value>0.0.0.0:50011</value>
</property>
<property>
<name>dfs.datanode.http.address</name>
<value>0.0.0.0:50076</value>
</property>
<property>
<name>dfs.datanode.ipc.address</name>
<value>0.0.0.0:50021</value>
</property>
<property>
<name>dfs.replication</name>
<value>3</value>
</property>
</span>
前三个是新添加的