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From "Wang Xu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1405) Make FSVolumeSet in FSDataSet pluggable
Date Sun, 05 Dec 2010 14:20:12 GMT

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

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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