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https://issues.apache.org/jira/browse/APEXCORE-528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15513525#comment-15513525
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Alex McCullough commented on APEXCORE-528:
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https://github.com/apache/apex-core/blob/master/engine/src/main/java/com/datatorrent/stram/plan/logical/LogicalPlan.java#L1748-L1773

> Output Ports Not Optional by Default During Validation
> ------------------------------------------------------
>
>                 Key: APEXCORE-528
>                 URL: https://issues.apache.org/jira/browse/APEXCORE-528
>             Project: Apache Apex Core
>          Issue Type: Bug
>    Affects Versions: 3.4.0
>            Reporter: Alex McCullough
>            Assignee: Alex McCullough
>            Priority: Minor
>
> The 'optional' OutputPortFieldAnnotation states that the default value is 
> true. When you build a DAG with multiple output ports the validator throws an 
> error telling you at least one must be connected. To fix, you must explicitly 
> add the annotation to all output ports and set the value to True, which is 
> supposed to already be the default.



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