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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "FAQ" by KonstantinShvachko
Date Fri, 27 Jun 2008 19:54:44 GMT
Dear Wiki user,

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

The following page has been changed by KonstantinShvachko:
http://wiki.apache.org/hadoop/FAQ

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  The only purpose of the secondary name-node is to perform periodic checkpoints.
  The secondary name-node periodically downloads current name-node image and edits log files,
  joins them into new image and uploads the new image back to the (primary and the only) name-node.
- See [http://hadoop.apache.org/core/docs/current/hdfs_user_guide.html#Secondary+Namenode
JavaDoc]
+ See [http://hadoop.apache.org/core/docs/current/hdfs_user_guide.html#Secondary+Namenode
User Guide].
  
  So if the name-node fails and you can restart it on the same physical node then there is
no need 
  to shutdown data-nodes, just the name-node need to be restarted.

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