Hadoop 1.21 Name node startup issue

While I was trying to poke around in hadoop environment I noticed that namenode wouldn’t start up. After doing some research I found that its the IPv6 issue. So I summarized steps I took to resolve the issue

 

 

 

hadoop jps 1

 

hadoop start 2

 

 

We are starting the hadoop stack

hadoop missing name node 3

we can see the name node seems like it did not start as we can see in jps list

first step is make sure you can ssh local machine (127.0.0.1)

hadoop ssh port activity

I tried tee see port activity looks like entire hadoop stack is using Ip6. we can change this behavior by changing hadoop-env.sh file in conf directory

 

set hadoop to use ipv4

 

export HADOOP_OPTS=-Djava.net.preferIPv4Stack=true

stop all hadoop services and start hadoop stak

hadoop start 5 all

 

 

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