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https://issues.apache.org/jira/browse/HDFS-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731611#action_12731611
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Hong Tang commented on HDFS-487:
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The wikipedia page tells you 5 ways of doing it.
> HDFS should expose a fileid to uniquely identify a file
> -------------------------------------------------------
>
> Key: HDFS-487
> URL: https://issues.apache.org/jira/browse/HDFS-487
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: fileid1.txt
>
>
> HDFS should expose a id that uniquely identifies a file. This helps in
> developing applications that work correctly even when files are moved from
> one directory to another. A typical use-case is to make the Pluggable Block
> Placement Policy (HDFS-385) use fileid instead of filename.
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