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Date: Sat, 19 Sep 2009 23:24:16 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-487) HDFS should expose a fileid to
 uniquely identify a file
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    [ https://issues.apache.org/jira/browse/HDFS-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757713#action_12757713 ] 

dhruba borthakur commented on HDFS-487:
---------------------------------------

Hi folks, now that HDFS-385 has been committed I would like to resurrect the discussion about fileids for HDFS files. 

The negative feedback earlier was from Raghu who mentioned that it may be premature to introduce the concept of a fileid. In some sense, this is true but is more of a chicken-and-egg problem. The existence of a fileid simplifies many-a-applications. Can we have some discussion on what the possible dis-advantages of introducing a fileid might be?

 
> 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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