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From "Wang Xu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1405) Make FSVolumeSet in FSDataSet pluggable
Date Thu, 16 Sep 2010 23:12:33 GMT
Make FSVolumeSet in FSDataSet pluggable
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                 Key: HDFS-1405
                 URL: https://issues.apache.org/jira/browse/HDFS-1405
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 0.22.0
            Reporter: Wang Xu
            Assignee: Wang Xu


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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