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https://issues.apache.org/jira/browse/HDFS-867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796665#action_12796665
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Steve Loughran commented on HDFS-867:
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How do plan to use this? In data placement? And balancing?
> 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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