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Hadoop >> mail # user >> Issue:  Namenode is in safe mode

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Re: Issue: Namenode is in safe mode
How was the namenode A relieved of its duty and what was the default
replication factor?

If the replication factor was 1 and the datanode A was unplugged without
any care then you lost half of your files and your namenode is not really
happy about it (and is waiting for you to correct the mistake or let it
slip explicitely).



On Wed, Mar 6, 2013 at 10:51 AM, AMARNATH, Balachandar <

> Hi,
> I have created a hadoop cluster with two nodes (A and B). ‘A’ act both as
> namenode and datanode, and ‘B’ act as datanode only. With this setup, I
> could store, read files. Now, I added one more datanode ‘C’ and relieved
> ‘A’ from datanode duty. This means, ‘A’ act only as namenode, and both B
> and C act as datanodes. Now, I tried to create a directory, it says
> ‘ org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create
> directory Name node is in safe mode’
> Can someone tell me why the namenode now is in safe mode?
> With thanks and regards
> Balachandar
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