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https://issues.apache.org/jira/browse/HDFS-10779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15531097#comment-15531097
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Kihwal Lee commented on HDFS-10779:
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+1 nice improvement to not re-resolve the same thing multiple times.
> Rename does not need to re-solve destination
> --------------------------------------------
>
> Key: HDFS-10779
> URL: https://issues.apache.org/jira/browse/HDFS-10779
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-10779.patch
>
>
> Rename uses {{FSDirectory.isDir(String)}} to determine if the destination is
> a directory. This dissect the path, creates an IIP, checks if the last inode
> is a directory. The rename operations already have the IIP and can check it
> directly.
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