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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-487) HDFS should expose a fileid to uniquely identify a file
Date Thu, 16 Jul 2009 17:41:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732045#action_12732045
] 

Raghu Angadi commented on HDFS-487:
-----------------------------------

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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