Everything else starting on Hadoop pseudo-distributed except namenode

Question

I have Hadoop 2.9.0 on Ubuntu at

/usr/local/hadoop

But when I try start-dfs.sh No error is shown while starting namenode But when I type jps, only

10900 SecondaryNameNode
11047 Jps
10696 DataNode

Seams to have started, not namenode

Things tried: => Removed temp files and formatted namenode hadoop namenode -format

terminal:

blaze@blazian:/tmp$ start-dfs.sh
Starting namenodes on [localhost]
blaze@localhost's password: 
localhost: starting namenode, logging to /usr/local/hadoop/logs/hadoop-blaze-namenode-blazian.out
blaze@localhost's password: 
localhost: starting datanode, logging to /usr/local/hadoop/logs/hadoop-blaze-datanode-blazian.out
Starting secondary namenodes [0.0.0.0]
blaze@0.0.0.0's password: 
0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-blaze-secondarynamenode-blazian.out
blaze@blazian:/tmp$ jps
10900 SecondaryNameNode
11047 Jps
10696 DataNode

Check the logs at /usr/local/hadoop/logs to find out what happened and add the details to your question. — Mobin Ranjbar, Mar 13 '18 at 06:24
The fact that you're prompted for a password means **passwordless** SSH was not setup correctly during Hadoop installation — OneCricketeer, Mar 13 '18 at 12:22

score 0 · Answer 1 · answered Apr 19 '18 at 19:23

You don't have a SSH setup with localhost. Please follow these steps and you'll be able to run the namenode.

Go to your system terminal and type:

cd(It will redirect you to ~)
ssh-keygen(hit enter three times and it will create a .ssh directory in ~)
cat id_rsa.pub >> authorized_keys(it will make sure that your localhost is the trusted source and give permission to make passwordless ssh.)

Then simply run start-all.sh and you're all set.

Everything else starting on Hadoop pseudo-distributed except namenode

1 Answers1