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https://issues.apache.org/jira/browse/HDFS-11242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17953240#comment-17953240
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Dheeren Beborrtha commented on HDFS-11242:
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Why is this not part of regular release ? This is an important bug/feature. We
should avoid restart of namenode.
In clusters where new hdfs datanodes are to be added, this needs a restart of
namenode. And this could be an expensive operation in a large loaded clusters.
> 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
> Labels: pull-request-available
> Attachments: HDFS-11242.002.patch, HDFS-11242.patch
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> 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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