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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4946) Allow preferLocalNode in BlockPlacementPolicyDefault to be configurable
Date Wed, 14 Aug 2013 15:47:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739790#comment-13739790
] 

Harsh J commented on HDFS-4946:
-------------------------------

bq. Allow preferLocalNode in BlockPlacementPolicyDefault to be disabled in configuration to
prevent *a client* from writing the first replica of every block (i.e. the entire file) to
the local DataNode.

The description reads to prevent specific clients, but the config toggle would shut off all
clients from writing locally, which may not be desirous. Ideally we would like a client sent
hint that influences the selection.
                
> Allow preferLocalNode in BlockPlacementPolicyDefault to be configurable
> -----------------------------------------------------------------------
>
>                 Key: HDFS-4946
>                 URL: https://issues.apache.org/jira/browse/HDFS-4946
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha
>            Reporter: James Kinley
>            Assignee: James Kinley
>         Attachments: HDFS-4946-1.patch
>
>
> Allow preferLocalNode in BlockPlacementPolicyDefault to be disabled in configuration
to prevent a client from writing the first replica of every block (i.e. the entire file) to
the local DataNode.

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