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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-867) Add a PowerTopology class to aid replica placement and enhance availability of blocks
Date Thu, 03 Mar 2011 02:44:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001834#comment-13001834
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Tsz Wo (Nicholas), SZE commented on HDFS-867:
---------------------------------------------

This is an interesting idea.  How should {{PowerTopology}} be implemented?

> Add a PowerTopology class to aid replica placement and enhance availability of blocks

> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-867
>                 URL: https://issues.apache.org/jira/browse/HDFS-867
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Jeff Hammerbacher
>            Priority: Minor
>
> Power outages are a common reason for a DataNode to become unavailable. Having a data
structure to represent to the power topology of your data center can be used to implement
a power-aware replica placement policy.

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