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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 Sat, 28 May 2011 21:34:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040678#comment-13040678
] 

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

Note that this isn't likely to get committed to the 'append' branch unless it's committed
to trunk first. The idea of append was a stopgap so HBase would have something to use until
a later release is out. But it shouldn't be seen as a testing ground for new ideas.

bq. Unfortunately Lucene cannot work with non-local replicas

Let's separate "cannot work" from "cannot work as fast as it otherwise could".

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.

> 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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