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From "Niklas Quarfot Nielsen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MESOS-2622) Document the semantic change in decorator return values
Date Wed, 15 Apr 2015 23:36:59 GMT
Niklas Quarfot Nielsen created MESOS-2622:
---------------------------------------------

             Summary: 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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