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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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Attachment: HDFS-2391.patch
> 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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