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https://issues.apache.org/jira/browse/HDFS-4334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13540555#comment-13540555
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Konstantin Shvachko commented on HDFS-4334:
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> I feel the same way. Just have filed HDFS-4346 to do the refactoring.

I really don't understand why introduce code that is due to refactoring on 
delivery.
                
> Add a unique id to each INode
> -----------------------------
>
>                 Key: HDFS-4334
>                 URL: https://issues.apache.org/jira/browse/HDFS-4334
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>             Fix For: 3.0.0
>
>         Attachments: HDFS-4334.patch, HDFS-4334.patch, HDFS-4334.patch
>
>
> This JIRA is to track the task to add inode id, which is a 64bit number. 
> Unlike many local file systems, HDFS doesn't recycle inode id.

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