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https://issues.apache.org/jira/browse/HDFS-5237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773861#comment-13773861
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Philip Zeyliger commented on HDFS-5237:
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Colin: I agree--totally reasonable for dfs.datanode.hostname to be a hostname.
(Or, at least, something that you can connect to (ip or hostname).)
> Get rid of nodes' registration names
> ------------------------------------
>
> Key: HDFS-5237
> URL: https://issues.apache.org/jira/browse/HDFS-5237
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Junping Du
> Fix For: 3.0.0
>
> Attachments: HDFS-5237.patch
>
>
> Per discussion in HDFS-5208 and may be some other discussions before, Node's
> registration name is pretty confusing and shouldn't be used in production
> environment as topology resolving issues. So we remove related configuration
> dfs.datanode.hostname or its old one "slave.host.name".
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