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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2004) Enable replicating and pinning files to a data node
Date Sat, 28 May 2011 23:24:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040695#comment-13040695
] 

Jason Rutherglen commented on HDFS-2004:
----------------------------------------

{quote}If it indeed cannot work without a local replica, then I agree with Allen/Eli - you
should just plan on copying the blocks you need over to a local tmp directory and people will
take the capacity hit.{quote}

I think we may be a little out of scope for this issue.  The Lucene index isn't static, it'll
be updated somewhat frequently.  If we have a separate temp directory, there is a lot of room
for error, in addition to the natural redundancy.  As this is experimental/researchy I think
we can try the current system out, and if it doesn't work, examine other possibilities?

> 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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