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https://issues.apache.org/jira/browse/HDFS-11530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15926854#comment-15926854
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Chen Liang commented on HDFS-11530:
-----------------------------------

hi [~linyiqun],

I've created JIRA HDFS-11535 as a placeholder for the performance test results 
and any further discussion/suggestions. Also we proposed a way to integrate 
this new chooseRandom method, by a mixture of both the current and the new 
methods. Do you mind taking a look at this JIRA? Thanks!

> 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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