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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2004) Enable replicating and pinning files to a data node
Date Fri, 27 May 2011 22:36:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040484#comment-13040484
] 

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

bq. The idea is for this to be a "LimitedPrivate" interface for use by specific applications

IIRC, the Hadoop interface definitions are based on what we had at Sun.  This type of usage
would likely have been called Contracted Private because it would basically be an agreement
between two non-related parties to support a non-public interface.  The terms of the Contract
would have dictated renewal agreements, change agreements, and other things.  IMO, that type
of agreement really can't exist in open source.  It is either open to be used or it isn't.
 

I understand that the ACL thing is so operations people have some control over who abuses
the system, but I think it's effectiveness will be zero, given how many shops have the development
team acting as the operations team.

> 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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