[jira] [Created] (MESOS-9658) Make command-line and/or environment variables be able to unset a flag.

["Chun-Hung Hsiao (JIRA)" <ji...@apache.org>]

Chun-Hung Hsiao created MESOS-9658:
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             Summary: Make command-line and/or environment variables be able to unset a flag.
                 Key: MESOS-9658
                 URL: https://issues.apache.org/jira/browse/MESOS-9658
             Project: Mesos
          Issue Type: Improvement
            Reporter: Chun-Hung Hsiao


Currently if a Mesos master/agent command-line flag is of type {{Option}}, the only way to leave it as {{None}} is to unset the corresponding {{MESOS_}} environment variable and don't specify the flag. Although this works, it would be nice if the user could:
1. Override environment variable through command-line flags, e.g. {{--feature_flag=none}}.
2. Override environment variable with another value, e.g., {{MESOS_FEATURE_FLAG=none}}. This is especially useful if users are managing Mesos through systemd and specifying flags through environment files.



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