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https://issues.apache.org/jira/browse/HDFS-3164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243221#comment-13243221
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Aaron T. Myers commented on HDFS-3164:
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One question: given that you removed DFS_NAMENODE_UPGRADE_PERMISSION_DEFAULT,
can we not also remove DFS_NAMENODE_UPGRADE_PERMISSION_KEY?
Other than that, the patch looks good to me. +1 pending Jenkins and an answer
to the question above.
> Move DatanodeInfo#hostName to DatanodeID
> ----------------------------------------
>
> Key: HDFS-3164
> URL: https://issues.apache.org/jira/browse/HDFS-3164
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hdfs-3164.txt
>
>
> Like HDFS-3138 (the ipcPort) the hostName field in DatanodeInfo is not
> ephemeral and should be in DatanodeID. This also allows us to fixup the issue
> where the DatanodeID#name field is overloaded (the DN sets it to a hostname,
> then the NN clobbers it with an IP, and then the DN clobbers it's hostname
> field with this IP). If the DN can specify both a "name" and "hostname" in
> the DatanodeID then this code becomes simpler.
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