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From Lewis John Mcgibbney <lewis.mcgibb...@gmail.com>
Subject Re: Accessing a Configuration Description
Date Sat, 23 May 2015 00:38:14 GMT
ACK Chris.
https://issues.apache.org/jira/browse/HADOOP-12021
Thanks. Lets see how the conversation goes over there.
Lewis

On Fri, May 22, 2015 at 2:24 PM, Chris Nauroth <cnauroth@hortonworks.com>
wrote:

> I'm sorry to be the bearer of bad news.  :-)
>
> It's possible there could be some push-back on the grounds of performance
> or memory footprint.  It's admittedly small, but the vast majority of
> users wouldn't need programmatic access to descriptions.
>
> I do think it would be worthwhile for you to file a jira and describe the
> use case and the proposal.  Then, anyone interested can participate in a
> deeper discussion of the trade-offs on that issue.
>
> --Chris Nauroth
>
>
>
>
> On 5/22/15, 1:27 PM, "Lewis John Mcgibbney" <lewis.mcgibbney@gmail.com>
> wrote:
>
> >Thanks for your reply Chris.
> >The answer is exactly what I didn't want to hear :)
> >I am using the configuration descriptions within the Nutch 2.X Web
> >Application and they are very useful for providing additional user context
> >for augmenting configuration via the interface.
> >Sigh...
> >Would this be something which would be appreciated as a patch?
> >I can easily submit one if you guys think it would be useful.
> >Thanks for your response.
> >Lewis
> >
> >On Fri, May 22, 2015 at 1:20 PM, Chris Nauroth <cnauroth@hortonworks.com>
> >wrote:
> >
> >> Hello Lewis,
> >>
> >> The contents of <description> elements are not parsed and held in the
> >> Configuration data structure at runtime, so there isn't any way to
> >>access
> >> them programmatically.  You can of course use external tools to parse
> >>the
> >> files directly and pull out the <description>.  For example, we use XSL
> >>in
> >> the project's documentation to build an HTML table of the configuration
> >> properties, including <description>.
> >>
> >>
> >>
> http://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-common/co
> >>re
> >> -default.xml
> >>
> >>
> >> --Chris Nauroth
> >>
> >>
> >>
> >>
> >> On 5/22/15, 12:24 PM, "Lewis John Mcgibbney" <lewis.mcgibbney@gmail.com
> >
> >> wrote:
> >>
> >> >Hi Folks,
> >> >Does anyone have a solution for accessing the value of the
> >><description>
> >> >tag below?
> >> >I cant seem to find it from within the Configuration object accessors.
> >> >
> >> ><property>  <name>hadoop.tmp.dir</name>
> >> ><value>/tmp/hadoop-${user.name}</value>
> >> >
> >> >  <description>blah blah blah</description>
> >> >
> >> > </property>
> >> >
> >> >Thanks in advance for any help.
> >> >Lewis
> >> >
> >> >--
> >> >*Lewis*
> >>
> >>
> >
> >
> >--
> >*Lewis*
>
>


-- 
*Lewis*

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