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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 21:03:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040443#comment-13040443
] 

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

The space increase is still likely to happen:  if a file has a rep of 3, but is requested
by 5 hosts, the block still ends up over-replicated. To work around that, the block would
need to be auto-rep'd to 5.  At some point, HDFS growth is out of control because every idiot
is going to want their blocks local.

> 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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