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From "Jiandan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12390) Support to refresh DNS to switch mapping
Date Tue, 05 Sep 2017 08:41:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153273#comment-16153273

Jiandan Yang  commented on HDFS-12390:

[~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-
> 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 TableMappingļ¼Œbut  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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