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Namenode to be in safemode while taking name node meta data and datanode backup ?

Namenode to be in safemode while taking name node meta data and datanode backup ?

Posts: 1,732
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Registered: ‎07-31-2013

Re: Namenode to be in safemode while taking name node meta data and datanode backup ?

Assuming by a NameNode backup you mean a simple 'hdfs dfsadmin -fetchImage' command, the NameNode does not need to be in a safe-mode to run it.

Am not sure what you mean by a DataNode backup. Data is replicated in HDFS, so a loss of single DataNode or a disk under a DataNode will not require backups to restore and will auto-heal.
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