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