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From "Harsh J (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2931) Switch the DataNode's BlockVolumeChoosingPolicy to be a private-audience interface
Date Fri, 10 Feb 2012 03:24:09 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J updated HDFS-2931:
--------------------------

    Attachment:     (was: 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-2931.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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