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https://issues.apache.org/jira/browse/HDFS-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966948#action_12966948
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Wang Xu commented on HDFS-1405:
-------------------------------

I update HDFS-1362 and stop trying to make the FSDataset and related class 
pluggable. So this issue should be close.

> Make FSVolumeSet in FSDataSet pluggable
> ---------------------------------------
>
>                 Key: HDFS-1405
>                 URL: https://issues.apache.org/jira/browse/HDFS-1405
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.22.0
>            Reporter: Wang Xu
>            Assignee: Wang Xu
>         Attachments: HDFS-1405.txt, HDFS-1405v2.txt, HDFS-1405v3.txt
>
>
> I am trying to submit a patch for HDFS-1362, which enable online add or 
> remove a volume of a serving DataNode.
> I managed to create the patch  avoiding modify exist class, but FSVolumeSet 
> is an exception, the member "volumes" is an array, while I need a List to 
> facilitate the hotplug procedure. Thus I have 2 possible solutions:
> * Provide a abstract class as its super class, with the definition of all its 
> methods. OR
> * Modify the volumes' definition in FSVolumeSet, as a Gereral Type 
> Collection<>, which may use different implementation in subclasses.
> I will supply a patch for the first method for review

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