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https://issues.apache.org/jira/browse/HDFS-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J Chouraria updated HDFS-1120:
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    Attachment: HDFS-1120.r3.diff

@Todd - Great comments, thank you!

I had initially wanted to construct FSVolumes myself, but I was not aware of 
Mockito's existence. It is a wonderful tool!

Attached a new patch with (hopefully) all your comments addressed.

> Make DataNode's block-to-device placement policy pluggable
> ----------------------------------------------------------
>
>                 Key: HDFS-1120
>                 URL: https://issues.apache.org/jira/browse/HDFS-1120
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Jeff Hammerbacher
>            Assignee: Harsh J Chouraria
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1120.r1.diff, HDFS-1120.r2.diff, HDFS-1120.r3.diff
>
>
> As discussed on the mailing list, as the number of disk drives per server 
> increases, it would be useful to allow the DataNode's policy for new block 
> placement to grow in sophistication from the current round-robin strategy.

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