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https://issues.apache.org/jira/browse/BIGTOP-492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238816#comment-13238816
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Roman Shaposhnik commented on BIGTOP-492:
-----------------------------------------
This is basically aimed at generalizing <foo>-env.sh. It can be used for having
a single client for multiple clusters or anything else where you might want to
have a system-level defaults and then
user-level ones. It is NOT explicitly for *xml. It is a
replacement/augmentation for *env.sh
The trouble with the current Hadoop ecosystem is that it is very
developer-centric in its use of <foo>-env.sh:
# this script must come from the HOME of the component and not system-level
location
# this script doesn't allow for a second level of defaults
Essentially, if you want to override things in, lets say, hadoop-env.sh you can
only do it at a system-level leaving the user to use .bashrc for user-level
overrides. That's the core issue this JIRA is trying to address.
> make our launcher scripts recognize cascading defaults
> ------------------------------------------------------
>
> Key: BIGTOP-492
> URL: https://issues.apache.org/jira/browse/BIGTOP-492
> Project: Bigtop
> Issue Type: Bug
> Components: General
> Affects Versions: 0.4.0
> Reporter: Roman Shaposhnik
> Assignee: Roman Shaposhnik
> Fix For: 0.4.0
>
>
> Almost all Unix (POSIX?) command line utilities have a nice feature of
> recognizing cascading defaults. The system-level one is typically named
> /etc/<util>rc and the user-level one is typically picked from ~/.<util>rc
> I propose that we introduce the same for all of the /usr/bin launcher scripts
> that we support in Bigtop. The proposed format of the rc files is that of
> POSIX-compatible sh(1) code snippet with an overall effect of exporting those
> variables that affect execution.
> Thoughts?
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