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https://issues.apache.org/jira/browse/HDFS-12390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153273#comment-16153273
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Jiandan Yang commented on HDFS-12390:
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[~djp] please review it and give me some comment.
> Support to refresh DNS to switch mapping
> ----------------------------------------
>
> Key: HDFS-12390
> URL: https://issues.apache.org/jira/browse/HDFS-12390
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: hdfs, hdfs-client
> Reporter: Jiandan Yang
> Assignee: Jiandan Yang
> Attachments: HDFS-12390.001.patch, HDFS-12390.002.patch,
> HDFS-12390-branch-2.8.2.001.patch
>
>
> As described in
> [HDFS-12200|https://issues.apache.org/jira/browse/HDFS-12200],
> ScriptBasedMapping may lead to NN cpu 100%. ScriptBasedMapping run
> sub_processor to get rack info of DN/Client, so we think it's a little
> heavy. We prepare to use TableMappingļ¼but TableMapping does not support
> refresh and can not reload rack info of newly added DataNodes.
> So we implement refreshDNSToSwitch in dfsadmin.
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