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https://issues.apache.org/jira/browse/HDFS-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wang Xu resolved HDFS-1405.
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Resolution: Won't Fix
All the changes has been done in HDFS-1362, and it is impractical to make the
FSDataset pluggable in this way.
> 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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