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https://issues.apache.org/jira/browse/HDFS-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732045#action_12732045
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Raghu Angadi commented on HDFS-487:
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Dhruba, can you describe _how_ fileid helps with pluggable block placement.
Many use cases are mentioned here but I can't find description of how.
'distcp -update' is not expected to be fool-proof (just like rsync). Even with
fileid, should distcp store fileids in previous update (or source and
destination files are expected to have same fileid?)?
> 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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