一个常见的问题:格式化namenode,造成无法启动datanode的问题. 问题描述: 无法启动datanode,查看日志,datanote尝试n次启动无效后,会出现这个语句 INFO org.apache.hadoop.ipc.RPC: Server at localhost/127.0.0.1:9000 not available yet, Zzzzz... 解决办法: 1.先清空tmp目录下的所有文件.因为每次namenode format会重新创建一个namen
NameNode类位于org.apache.hadoop.hdfs.server.namenode包下. NameNode serves as both directory namespace manager and "inode table" for the Hadoop DFS. There is a single NameNode running in any DFS deployment. (Well, except when there is a second backup/
报如下异常:*org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException): Datanode denied communication with namenode: DatanodeRegistration(127.0.0.1, storageID=DS-458765047-127.0.1.1-50010-1352144571385, infoP