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https://issues.apache.org/jira/browse/HDFS-10225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15248950#comment-15248950
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Colin Patrick McCabe commented on HDFS-10225:
---------------------------------------------
It seems cleaner to remove the volume and re-add it with the new storage type,
rather than mutating the existing volume. Otherwise, we need to think about
synchronization here around every use of storage type.
There are also some changes that look unrelated, like moving the call to
parseChangedVolunes up several lines.
> DataNode hot swap drives should recognize storage type tags.
> -------------------------------------------------------------
>
> Key: HDFS-10225
> URL: https://issues.apache.org/jira/browse/HDFS-10225
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.7.2
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Attachments: HDFS-10225.000.patch, HDFS-10225.001.patch
>
>
> The current hot swap code only differentiate data dirs by their paths. People
> might want to change the types of certain data dirs from the default value in
> an existing cluster.
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