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Date: Thu, 26 May 2011 19:45:48 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2004) Enable replicating and pinning files
 to a data node
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    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039884#comment-13039884 ] 

Allen Wittenauer commented on HDFS-2004:
----------------------------------------

If an application requires a file have all its blocks local, it sounds incredibly flawed or it shouldn't be using HDFS. Having this type of semantic is basically completely against the whole design of HDFS.

> Enable replicating and pinning files to a data node
> ---------------------------------------------------
>
>                 Key: HDFS-2004
>                 URL: https://issues.apache.org/jira/browse/HDFS-2004
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer
>    Affects Versions: 0.23.0
>            Reporter: Jason Rutherglen
>
> Some HDFS applications require that a given file is on the local DataNode.  The functionality created here will allow pinning the file to any DataNode.

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