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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "NameNodeFailover" by SBertram
Date Wed, 10 Aug 2011 15:27:10 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "NameNodeFailover" page has been changed by SBertram:
http://wiki.apache.org/hadoop/NameNodeFailover?action=diff&rev1=7&rev2=8

Comment:
Removed incorrect assertion. Adding data nodes won't affect probability of namenode hardware
failure.  Statement was only true for fixed failures (e.g. "I will put an axe through one
server per week")

  === Introduction ===
- As of 0.20, Hadoop does not support automatic recovery in the case of a NameNode failure.
 This is a well known and recognized single point of failure in Hadoop.  The good news is
that as you add more nodes to a grid, the statistical probability that the NameNode will fail
goes down.
+ As of 0.20, Hadoop does not support automatic recovery in the case of a NameNode failure.
 This is a well known and recognized single point of failure in Hadoop.
  
  Experience at Yahoo! shows that NameNodes are more likely to fail due to misconfiguration,
network issues, and bad behavior amongst clients than actual hardware problems.  Out of fifteen
grids over three year period, only three NameNode failures were related to hardware problems.
  

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