[jira] [Commented] (MESOS-3340) Command-line flags should take precedence over OS Env variables

["Klaus Ma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-3340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14738963#comment-14738963 ] 

Klaus Ma commented on MESOS-3340:
---------------------------------

RR: https://reviews.apache.org/r/38259/ , [~bernd-mesos], would you help to shepherd on this ticket?
Current solution is to throw error if any duplicated item.

> Command-line flags should take precedence over OS Env variables
> ---------------------------------------------------------------
>
>                 Key: MESOS-3340
>                 URL: https://issues.apache.org/jira/browse/MESOS-3340
>             Project: Mesos
>          Issue Type: Improvement
>          Components: stout
>    Affects Versions: 0.24.0
>            Reporter: Marco Massenzio
>            Assignee: Klaus Ma
>              Labels: mesosphere, tech-debt
>
> Currently, it appears that re-defining a flag on the command-line that was already defined via a OS Env var ({{MESOS_*}}) causes the Master to fail with a not very helpful message.
> For example, if one has {{MESOS_QUORUM}} defined, this happens:
> {noformat}
> $ ./mesos-master --zk=zk://192.168.1.4/mesos --quorum=1 --hostname=192.168.1.4 --ip=192.168.1.4
> Duplicate flag 'quorum' on command line
> {noformat}
> which is not very helpful.
> Ideally, we would parse the flags with a "well-known" priority (command-line first, environment last) - but at the very least, the error message should be more helpful in explaining what the issue is.



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