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https://issues.apache.org/jira/browse/HDFS-5157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763125#comment-13763125
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Junping Du commented on HDFS-5157:
----------------------------------

Thanks for review and comments. Nicholas! I address your comments in updated 
(v2) patch. Please help to review it again. Thx!
Hi Eric, as I am having the same question, I would leave this for Nicholas or 
Arpit to answer (here or HDFS-4990). 
                
> Datanode should allow choosing the target storage
> -------------------------------------------------
>
>                 Key: HDFS-5157
>                 URL: https://issues.apache.org/jira/browse/HDFS-5157
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: Heterogeneous Storage (HDFS-2832)
>            Reporter: Arpit Agarwal
>            Assignee: Junping Du
>         Attachments: HDFS-5157-v1.patch, HDFS-5157-v2.patch
>
>
> Datanode should allow should choosing a target Storage or target Storage Type 
> as a parameter when creating a new block. Currently there are two ways in 
> which the target volume is chosen (via {{VolumeChoosingPolicy#chooseVolume}}.
> # AvailableSpaceVolumeChoosingPolicy
> # RoundRobinVolumeChoosingPolicy
> BlockReceiver and receiveBlock should also accept a new parameter for target 
> storage or storage type.

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