How to recover bad namenode from good namenode

Question

I want to share all , about how to recover second bad namenode when using the good namenode

• example of one bad namenode and one good namenode

So for this scenario lets say the following

The bad namenode is on machine hadoop1 The good namenode is on machine hadoop2

As all know the following folders are the most important folders on the namenode machines

/hadoop/hdfs/journal/hdfsha/current

/var/hadoop/hdfs/namenode/current

So the question is:

How to recover the bad namenode when using the folders - /hadoop/hdfs/journal/hdfsha/current , /var/hadoop/hdfs/namenode/current ?

For example , can we do the following ?

On bad namenode ( hadoop1 machine )

Stop all namenode services ( include journal nodes and zookeeper fail over )

mv  /hadoop/hdfs/journal/hdfsha/current   /hadoop/hdfs/journal/hdfsha/current_bad

mv /var/hadoop/hdfs/namenode/current /var/hadoop/hdfs/namenode/current_bad



mkdir /hadoop/hdfs/journal/hdfsha/current   

mkdir /var/hadoop/hdfs/namenode/current



chown hdfs:Hadoop /hadoop/hdfs/journal/hdfsha/current   

chown hdfs:Hadoop /var/hadoop/hdfs/namenode/current

copy the content of the good namenode folders /hadoop/hdfs/journal/hdfsha/current to bad namenode - /hadoop/hdfs/journal/hdfsha/current

copy the content of the good namenode /var/hadoop/hdfs/namenode/current to bad namenode - /var/hadoop/hdfs/namenode/current

start all HDFS service as namenode , journal nodes , zookeeper fail over

is this scenario can recover the bad namenode ? ,

NOTE - if some steps are missing then please share any info about this