Namenode not getting started

Question

I was using Hadoop in a pseudo-distributed mode and everything was working fine. But then I had to restart my computer because of some reason. And now when I am trying to st

Answer 1

Add hadoop.tmp.dir property in core-site.xml

  
    fs.defaultFS
    hdfs://localhost:9000
  
  
    hadoop.tmp.dir
    /home/yourname/hadoop/tmp/hadoop-${user.name}
  

and format hdfs (hadoop 2.7.1):

$ hdfs namenode -format

The default value in core-default.xml is /tmp/hadoop-${user.name}, which will be deleted after reboot.