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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