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From "Philip Zeyliger (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BIGTOP-492) make our launcher scripts recognize cascading defaults
Date Mon, 26 Mar 2012 17:48:28 GMT

    [ https://issues.apache.org/jira/browse/BIGTOP-492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238608#comment-13238608
] 

Philip Zeyliger commented on BIGTOP-492:
----------------------------------------

Is this to more easily support multiple Hadoop clusters on the same machine?  Is it for the
*xml files, the *env files, both? 

I'm not clear what this issue is trying to fix.  {{.my.cnf}}, something vaguely similar, lets
you specify MySQL client configs, but Hadoop's configs are very mixed client/server.
                
> 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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