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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6287) Support units for configuration knobs
Date Tue, 29 Sep 2009 05:39:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12760499#action_12760499
] 

eric baldeschwieler commented on HADOOP-6287:
---------------------------------------------

So what happens if I ask for the same config property, once as a time and once as storage?
It would seem clearer to spec what the unit is, valid ranges, etc in one place, where the
property is defined...

Can the current code be bent to support that style?  We could then put config documentation
in the same place and auto-generate all kinds of useful information.

It seems like we should allow long text (IE gigabytes) as well as GB.  We need to be careful
of bits vs bytes.  gB and gb are not the same thing.  Taking the shorthand seems error prone
in networking contexts where bits are the default.  Given that we know this is byes, taking
just the scale [pgmk] seems fine, but we would need to know that.  

We should probably throw an exception, not default or truncate when a value is out of range
or uses a surprising unit (bits for bytes for example).

> 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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