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https://issues.apache.org/jira/browse/HDFS-11530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924703#comment-15924703
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Arpit Agarwal commented on HDFS-11530:
--------------------------------------

[~linyiqun], let's hold off on doing this for now. We want to do more testing 
and validation with DFSNetorkTopology before making it the default.

> Use HDFS specific network topology to choose datanode in 
> BlockPlacementPolicyDefault
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-11530
>                 URL: https://issues.apache.org/jira/browse/HDFS-11530
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-11530.001.patch
>
>
> The work for {{chooseRandomWithStorageType}} has been merged in HDFS-11482. 
> But this method is contained in new topology {{DFSNetworkTopology}} which is 
> specified for HDFS. We should update this and let 
> {{BlockPlacementPolicyDefault}} use the new way since the original way is 
> inefficient.



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