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https://issues.apache.org/jira/browse/MESOS-1162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14546181#comment-14546181
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Marco Massenzio commented on MESOS-1162:
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As I've been adding some functionality around {{stout::BaseFlags}} I'll be
looking into doing this: looks like a fun project and simple enough that I
won't be causing too much damage.
> Add a 'Percentage' abstraction.
> -------------------------------
>
> Key: MESOS-1162
> URL: https://issues.apache.org/jira/browse/MESOS-1162
> Project: Mesos
> Issue Type: Improvement
> Components: stout
> Reporter: Benjamin Mahler
> Assignee: Marco Massenzio
> Priority: Minor
>
> It is currently difficult to add a percentage-based flag, if one desires it
> to be specified in the "0%"-"100%" form. This requires creating a {{string}}
> flag and doing all the parsing / validation manually.
> An alternative is to use a {{double}} flag with 0.0-1.0 being the valid
> range, however, this may not read as intuitively to operators.
> Another alternative is to use a {{double}} flag with 0.0-100.0 as the valid
> range, with the '%' being implicit.
> However, these two alternative techniques can lead to confusion since it's
> not clear how we're interpreting the value. Requiring the '%' symbol is nice
> because it leaves no room for ambiguity.
> I would propose adding a 'Percentage' abstraction in stout that provides the
> parsing logic for use in flags. Percentages can basically be a wrapper around
> the underlying {{double}}.
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