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https://issues.apache.org/jira/browse/HADOOP-3625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717081#action_12717081
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Steve Loughran commented on HADOOP-3625:
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you can use {{netmask.length()==0) over "".equals(netmask); I think it is ever
so slightly faster.
> Add an ip address mask to rack name java plugin
> -----------------------------------------------
>
> Key: HADOOP-3625
> URL: https://issues.apache.org/jira/browse/HADOOP-3625
> Project: Hadoop Core
> Issue Type: Improvement
> Components: util
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Attachments: hadoop-3625.patch
>
>
> We should have a plugin that implements DNSToSwitchMapping with a
> configurable netmask that defines the rack. Therefore, if you use the high 26
> bits to determine your switch, you could configure it with "ff.ff.ff.c0"
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