Hadoop namenode -format error java io IOException

Question

When I run ./hadoop namenode -format command, I get this error:

26/11/18 17:03:56 ERROR namenode.NameNode: java.io.IOException: Cannot create directory /your/path/to/hadoop/tmp/dir/hadoop-hadoop/dfs/name/current
    at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.clearDirectory(Storage.java:295)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1086)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1110)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:856)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:948)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)

sudo: no valid sudoers sources found, quitting

How to solve this?

Answer 1

Run the command as sudo or add the current user as sudoer , like this:

sudo usermod -a -G sudo <username>

and then run the command.