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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1451) Extend the pluggable block placement policy interface to handle/allow file-level intelligence
Date Wed, 05 Dec 2012 18:18:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510654#comment-13510654
] 

Harsh J commented on HDFS-1451:
-------------------------------

Could you also post some use-cases behind this? What would drive one to use different placement
policies for different files in general?
                
> Extend the pluggable block placement policy interface to handle/allow file-level intelligence
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1451
>                 URL: https://issues.apache.org/jira/browse/HDFS-1451
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 0.21.0
>            Reporter: Harold Lim
>
> The current pluggable block placement policy interface (https://issues.apache.org/jira/browse/HDFS-385)
sets the policy globally. I propose to have this interface be extended to allow setting the
policy on a file-level basis. For example, there may be cases where certain files may simply
need the default policy and certain other files need more complex block placement policies.


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