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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6287) Support units for configuration knobs
Date Tue, 29 Sep 2009 10:26:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12760547#action_12760547
] 

Steve Loughran commented on HADOOP-6287:
----------------------------------------

This is getting very complex, and I am starting to thing -1 is the correct reaction to this
problem. There is a risk that this ends up a bit like the XSD type system.

I'm also worried about the impact this has on my plans to add support for >1 configuration
back end, including LDAP.

FWIW, in the SmartFrog syntax we have basic math symbols, stops the caller having to care
about stuff. But it does mean the type system needs to differentiate between string and numeric
values, 

{code}
  dfs.balance.bandwidthPerSec  (1024 * 1024);
  dfs.block.size  (65536 * 1024);
  dfs.blockreport.intervalMsec  (60 * 60 * 1000);
  mapred.tasktracker.expiry.interval (10 * 60 * 1000);
  mapred.jobtracker.retirejob.check (60 * 1000);
{code}
Of course, then you need functions, evaluation order rules, etc, etc, which are bonus complexity,
especially if you start worrying about where that work takes place, in the getInt/getLong()
operation, or everywhere




> 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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