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https://issues.apache.org/jira/browse/HDFS-9715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127991#comment-15127991
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Vinayakumar B commented on HDFS-9715:
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{{TestDFSRollback}} is failing because it expects, all data dirs to have same
VERSION file, but it will not after changing {{UpgradeUtilities.java}}.
So its better to exclude only {{storageId}} while comparing the props between
VERSION files across data dirs.
> Check storage ID uniqueness on datanode startup
> -----------------------------------------------
>
> Key: HDFS-9715
> URL: https://issues.apache.org/jira/browse/HDFS-9715
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.7.2
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Attachments: HDFS-9715.00.patch, HDFS-9715.01.patch,
> HDFS-9715.02.patch
>
>
> We should fix this to check storage ID uniqueness on datanode startup. If
> someone has manually edited the storage ID files, or if they have duplicated
> a directory (or re-added an old disk) they could end up with a duplicate
> storage ID and not realize it.
> The HDFS-7575 fix does generate storage UUID for each storage, but not checks
> the uniqueness of these UUIDs.
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