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Hadoop >> mail # user >> Backup NameNode metadata in HA configuration

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Backup NameNode metadata in HA configuration

We are using following version of Hadoop software: 2.0.0-cdh4.1.1.

HDFS HA configuration is applied.

I would like to ask if there are any difference or possible side effects of
backing up namenode data directory.

It is ok to just copy NN data directory from active NN to another host,
what about standby NN?
Or it may NN metadate can be in inconsistent state?
Is there any advantages of using "hdfs dfsadmin -fetch <file>" command?

Best Regards
Ivan Tretyakov

Deployment Engineer
Grid Dynamics
+7 812 640 38 76
Skype: ivan.v.tretyakov