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https://issues.apache.org/jira/browse/HDFS-13469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16441543#comment-16441543
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Íñigo Goiri commented on HDFS-13469:
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As [~daryn] pointed out in HDFS-12615, each namesystem uses a special path 
under "/.reserved/.inodes" to handle inodes.
I'm not really sure about the structure of this and if there is a way to map 
inodes to subclusters.
I remember [~chris.douglas] added some full identifier.
Is the namespace id available there?
Does anybody have a pointer to the documentation for the inodes?

> RBF: Support InodeID in the Router
> ----------------------------------
>
>                 Key: HDFS-13469
>                 URL: https://issues.apache.org/jira/browse/HDFS-13469
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Priority: Major
>
> The Namenode supports identifying files through inode identifiers.
> Currently the Router does not handle this properly, we need to add this 
> functionality.



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