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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2004) Enable replicating and pinning files to a data node
Date Sun, 05 Jun 2011 19:38:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044613#comment-13044613
] 

Aaron T. Myers commented on HDFS-2004:
--------------------------------------

@Allen, what exactly are you vetoing, and for what reasons? It seems to me that a veto here
may be a little premature, given that so far there is no code posted, or even an exact design
settled upon.

In particular, several commenters have already said that "pinning" a block to a particular
DN is probably not feasible, but that "requesting" the NN move a block to a particular DN
may be doable, and would be very handy for HBase. Are you vetoing the former, the latter,
or both?

> 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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