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https://issues.apache.org/jira/browse/HDFS-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J updated HDFS-2931:
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    Target Version/s: 0.24.0, 0.23.2  (was: 0.23.2, 0.24.0)
              Status: Patch Available  (was: Open)
    
> Switch the DataNode's BlockVolumeChoosingPolicy to be a private-audience 
> interface
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-2931
>                 URL: https://issues.apache.org/jira/browse/HDFS-2931
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: data-node
>    Affects Versions: 0.23.0
>            Reporter: Harsh J
>            Assignee: Harsh J
>            Priority: Minor
>              Labels: api
>         Attachments: HDFS-2391.patch
>
>
> From Nicholas, at the tail of HDFS-1120:
> {quote}
> However, if we annotate it as public, all the classes associated with them 
> should also be annotated as public. Also, whenever we change the interface or 
> any of the associated classes, it is an incompatible change.
> In our case, BlockVolumeChoosingPolicy uses FSVolumeInterface, which is a 
> part of FSDatasetInterface. In FSDatasetInterface, there are many classes 
> should not be exposed. One way to solve it is to make FSVolumeInterface 
> independent of FSDatasetInterface. However, FSVolumeInterface is not yet a 
> well-designed interface for the public.
> For these reasons, it is justified to annotate it as private, the same as 
> BlockPlacementPolicy.
> {quote}
> We should switch BlockVolumeChoosingPolicy to for a private audience.

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