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https://issues.apache.org/jira/browse/HDFS-10225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15255358#comment-15255358
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Arpit Agarwal commented on HDFS-10225:
--------------------------------------

Hi [~eddyxu], I prefer we disallow changing the storage type of a directory 
without a restart. Is there a strong use case for doing this without restarts? 
Thanks.

> 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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