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https://issues.apache.org/jira/browse/HDFS-11242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16870486#comment-16870486
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Hadoop QA commented on HDFS-11242:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  6s{color} 
| {color:red} HDFS-11242 does not apply to trunk. Rebase required? Wrong 
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11242 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12843182/HDFS-11242.002.patch |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27043/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


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> Add refresh cluster network topology operation to dfs admin
> -----------------------------------------------------------
>
>                 Key: HDFS-11242
>                 URL: https://issues.apache.org/jira/browse/HDFS-11242
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Reid Chan
>            Priority: Minor
>         Attachments: HDFS-11242.002.patch, HDFS-11242.patch
>
>
> The network topology and dns to switch mapping are initialized at the start 
> of the namenode.
> If admin wants to change the topology because of new datanodes added, he has 
> to stop and restart namenode(s), otherwise those new added datanodes are 
> squeezed under /default-rack.
> It is a low frequency operation, but it should be operated appropriately, so 
> dfs admin should take the responsibility.



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