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https://issues.apache.org/jira/browse/HADOOP-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620142#action_12620142
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Allen Wittenauer commented on HADOOP-3862:
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Typically, netmasks are either defined as 0xffffff00 or 255.255.255.0 .
ff.ff.ff.00 just looks weird to me. :)
Also, what happens if IPv6 is in use?
> 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 Core
> Issue Type: New Feature
> 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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