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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3625) Add an ip address mask to rack name java plugin
Date Sun, 07 Jun 2009 19:05:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717081#action_12717081
] 

Steve Loughran commented on HADOOP-3625:
----------------------------------------

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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