You can run "hadoop fsck / " to see how many blocks are missing on your cluster.
See definition of safe mode here.
http://lucene.apache.org/hadoop/api/org/apache/hadoop/dfs/NameNode.html#setSafeMode(org.apache.hadoop.dfs.FSConstants.SafeModeAction)

--Konstantin

erolagnab wrote:

Hi all,

Just wondering what is the reason causing NameNode is on SafeMode forever?
I've left my machine running for 2 days and it's still on Safe Mode.

Trung

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