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https://issues.apache.org/jira/browse/FLINK-3147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047255#comment-15047255
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Nick Dimiduk commented on FLINK-3147:
-------------------------------------

Looks like we should open up all the instance variables as protected as well. 
At least everything that's not already exposed via accessor methods. What's the 
preferred style: add protected accessor methods or mark the fields protected?

> HadoopOutputFormatBase should expose mutexes for subclasses
> -----------------------------------------------------------
>
>                 Key: FLINK-3147
>                 URL: https://issues.apache.org/jira/browse/FLINK-3147
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Nick Dimiduk
>            Priority: Minor
>
> While adopting PhoenixOutputFormat to a streaming job, I find that the 
> implementation of {{HadoopOutputFormatBase#close}} is not relevant when 
> there's no temp file to move. However, subclasses cannot effectively override 
> implementation because {{CLOSE_MUTEX}} is marked private.



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