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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2004) Enable replicating and pinning files to a data node
Date Fri, 27 May 2011 21:09:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040446#comment-13040446
] 

Todd Lipcon commented on HDFS-2004:
-----------------------------------

The idea is for this to be a "LimitedPrivate" interface for use by specific applications,
perhaps governed by an ACL. HBase for example can guarantee that only one node will be requesting
a local replica at a time.

The difficulties in implementation are obvious - eg you don't want it to fight against a balancer
or other placement policies in action on the cluster. But that's a matter to evaluate after
the work is done, if someone is willing to put forth the work.

> 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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