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https://issues.apache.org/jira/browse/HDFS-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849495#action_12849495
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Jeff Hammerbacher commented on HDFS-1064:
-----------------------------------------

Sorry, can't edit the above, but wanted to link to Dhruba's blog posts in case 
others had missed them:
* http://hadoopblog.blogspot.com/2009/11/hdfs-high-availability.html
* http://hadoopblog.blogspot.com/2010/02/hadoop-namenode-high-availability.html

Also, a research paper: http://portal.acm.org/citation.cfm?id=1651271

> NN Availability - umbrella Jira
> -------------------------------
>
>                 Key: HDFS-1064
>                 URL: https://issues.apache.org/jira/browse/HDFS-1064
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Sanjay Radia
>
> This is an umbrella jira for discussing availability of the HDFS NN and 
> providing references to other Jiras that improve its availability. This 
> includes, but is not limited to, automatic failover. 

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