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From Brian Bockelman <bbock...@math.unl.edu>
Subject Namenode response to out-of-disk space?
Date Thu, 08 Jan 2009 18:34:56 GMT
Hey,

What happens to the namenode when it runs out of disk space.  From  
reading the lists, it appears that:

a) Journal writes use pre-allocated space, so when a sync is actually  
done, HDFS should be guaranteed to write the full sync and not a  
partial one.
b) When the namenode detects it can't write into a volume anymore, it  
will go into safe-mode -- allowing reads from the system to continue.

Are there any more precautions that are taken to prevent a corrupted  
image?

Brian
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