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https://issues.apache.org/jira/browse/HADOOP-6616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239067#comment-14239067
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Adam Faris commented on HADOOP-6616:
------------------------------------

It looks like all the topology information regarding rack awareness was removed 
as 'cruft' in HADOOP-8427, when an effort to convert forrest docs to APT.   See 
patch numbered 5 and the diff shows everything related to rack awareness has 
been removed.  Removal is unfortunate as the documentation is still relevant 
for current versions of Hadoop.

> Improve documentation for rack awareness
> ----------------------------------------
>
>                 Key: HADOOP-6616
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6616
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Jeff Hammerbacher
>            Assignee: Adam Faris
>              Labels: newbie
>             Fix For: 3.0.0
>
>         Attachments: hadoop-6616.patch, hadoop-6616.patch.2, 
> hadoop-6616.patch.3, hadoop-6616.patch.4
>
>
> The current documentation for rack awareness 
> (http://hadoop.apache.org/common/docs/r0.20.0/cluster_setup.html#Hadoop+Rack+Awareness)
>  should be augmented to include a sample script.



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