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https://issues.apache.org/jira/browse/HDFS-5115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745399#comment-13745399
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Arpit Agarwal commented on HDFS-5115:
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Patch to allocate new Storage IDs as UUIDs. This solves the collision problem.
Leaving existing Storage IDs as they are. They will be changed to UUIDs when we
handle DataNode upgrades for HDFS-2832.
Post 2832 we could consider refactoring the type of the Storage ID from a
String to a UUID wherever referenced.
> Make StorageID a UUID
> ---------------------
>
> Key: HDFS-5115
> URL: https://issues.apache.org/jira/browse/HDFS-5115
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: 3.0.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: h5115.01.patch
>
>
> The Storage ID is currently generated from the DataNode's IP+Port+Random
> components. This scheme will not work when we have separate Storage IDs for
> each storage directory as there is a possibility of conflicts when an
> unreliable storage is intermittently offline.
> Converting it to a UUID makes collisions very unlikely.
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