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

["Marco Massenzio (JIRA)" <ji...@apache.org>]

Marco Massenzio created MESOS-3340:
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             Summary: 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


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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