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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6287) Support units for configuration knobs
Date Mon, 28 Sep 2009 10:36:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12760208#action_12760208

Steve Loughran commented on HADOOP-6287:

I think units are good, but they might need to be restricted to those conf values that are
asking for disk/memory capacity, rather than any integer. 

# if you are worrying about network rates, Gb for gigabit is the unit to consider, anyone
passing in PB is really in error
#  in {{dfs.blockreport.intervalMsec}}, and other time ranges, the value should be mS, S,
minutes, hours, etc.

While I am not proposing anyone rushes to do a complete type-safe framework, maybe a {{conf.getStorageValue()}}
might be the right method to return a storage value; other units of measurement could be patched
in for different types later

> Support units for configuration knobs
> -------------------------------------
>                 Key: HADOOP-6287
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6287
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Arun C Murthy
>            Assignee: Eli Collins
>         Attachments: hadoop-6287-1.patch
> We should add support for units in our Configuration system so that we can specify values
to be *1GB* or *1MB* rather than forcing every component which consumes such values to be
aware of these.

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