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https://issues.apache.org/jira/browse/HDFS-5104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742691#comment-13742691
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Suresh Srinivas commented on HDFS-5104:
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+1 for the patch with Jenkins +1.
> Support dotdot name in NFS LOOKUP operation
> -------------------------------------------
>
> Key: HDFS-5104
> URL: https://issues.apache.org/jira/browse/HDFS-5104
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: nfs
> Affects Versions: 3.0.0
> Reporter: Brandon Li
> Assignee: Brandon Li
> Attachments: HDFS-5104.patch, HDFS-5104.patch.2, HDFS-5104.patch.3
>
>
> Procedure LOOKUP searches a directory for a specific name and returns the
> file handle for the corresponding file system object. NFS client sets
> filename as ".." to get the parent directory information.
> Currently ".." is considered invalid name component. We only allow ".." when
> the path is an inodeID path as "/.reserved/.inodes/.."
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