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https://issues.apache.org/jira/browse/HADOOP-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HADOOP-3862.
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Resolution: Duplicate
Closing this as a dupe of HADOOP-3625, which actually has a patch on it!
> Create network topology plugin that uses a configured rack ip mask
> ------------------------------------------------------------------
>
> Key: HADOOP-3862
> URL: https://issues.apache.org/jira/browse/HADOOP-3862
> Project: Hadoop Common
> Issue Type: New Feature
> Components: net
> Reporter: Owen O'Malley
>
> We should have a Java class that answers network topology questions by
> implementing DNSToSwitchMapping by using the host's IP address and a mask
> that defines the addresses that are on the same rack. Therefore, if your
> racks are defined by using the top 3 octets, you'd configure ff.ff.ff.00.
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