CODEWITHSUNDEEP
hadoophdfshadoop2webhdfsbigdata
Sujoy
Sujoy

Reputation: 117

How to take namenode backup

I have a hadoop cluster with 6 datanode and 1 namenode. But I do not have any standby namenode or journal node. I know this is not a good practice but due to some constraints I have to continue with this for the time being.

Can any one tell me , how can I take backup of my namenode metadata manually? I have taken backup of fsimage by this command 

hdfs dfsadmin -fetchImage someFilename

But is this all I have to do? or I have to take a copy of dfs.namenode.name.dir directory also.

If fsimage is only thing, how can we restore the fsimage if my existing namenode goes down for hardware issue.

If I have the copy of dfs.namenode.name.dir directory and fsimage , in that case also , how can I use those for restore purpose?

Please let me know if any one knows process to take backup and restore of namenode metadata manually.

Thanks in advance....

Upvotes: 3

Views: 3224

Answers (1)

charan tej
charan tej

Reputation: 1054

Refer this link for the Backup of Namenode and Restoring of the Backup data:

http://www.cloudera.com/documentation/enterprise/5-5-x/topics/cm_mc_hdfs_metadata_backup.html

Upvotes: 2

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