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https://issues.apache.org/jira/browse/HDFS-11242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16870634#comment-16870634
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Lars Francke commented on HDFS-11242:
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I'm afraid I still don't fully understand.
Either way [~reidchan] I think this is a good change and desperately needed.
Are you willing to rebase and bring up-to-date?
If you like I can ask on the mailing list about some review support before you
spent time on this.
> 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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