There are 0 datanode(s) running and no node(s) are excluded in this operation

Question

I have set up a multi node Hadoop Cluster. The NameNode and Secondary namenode runs on the same machine and the cluster has only one Datanode. All the nodes are configured o

Answer 1

In my situation, I was missing the necessary properties inside hdfs-site.xml (Hadoop 3.0.0) installed using HomeBrew on MacOS. (The file:/// is not a typo.)

    dfs.namenode.name.dir
    file:///usr/local/Cellar/hadoop/hdfs/namenode



    dfs.datanode.data.dir
    file:///usr/local/Cellar/hadoop/hdfs/datanode