[jira] [Commented] (MESOS-2622) Document the semantic change in decorator return values

["Adam B (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-2622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498216#comment-14498216 ] 

Adam B commented on MESOS-2622:
-------------------------------

Probably belongs in the modules/hooks documentation, with a note in the upgrade doc for 0.23

> Document the semantic change in decorator return values
> -------------------------------------------------------
>
>                 Key: MESOS-2622
>                 URL: https://issues.apache.org/jira/browse/MESOS-2622
>             Project: Mesos
>          Issue Type: Documentation
>            Reporter: Niklas Quarfot Nielsen
>            Assignee: Niklas Quarfot Nielsen
>
> In order to enable decorator modules to _remove_ metadata (environment variables or labels), we changed the meaning of the return value for decorator hooks.
> The Result<T> return values means:
> ||State||Before||After||
> |Error|Error is propagated to the call-site|No change|
> |None|The result of the decorator is not applied|No change|
> |Some|The result of the decorator is *appended*|The result of the decorator *overwrites* the final labels/environment object|



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