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https://issues.apache.org/jira/browse/HDFS-8953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14743194#comment-14743194
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Steve Loughran commented on HDFS-8953:
--------------------------------------

If you are confident that it doesn't open a port, then I revert my veto. It's 
just I'd identified HDFS-8880 as a source of intermittent jenkins port-in-use 
failures, so was auditing adjacent patches for similar issues.

> DataNode Metrics logging
> ------------------------
>
>                 Key: HDFS-8953
>                 URL: https://issues.apache.org/jira/browse/HDFS-8953
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kanaka Kumar Avvaru
>            Assignee: Kanaka Kumar Avvaru
>         Attachments: HDFS-8953-01.patch, HDFS-8953-02.patch, 
> HDFS-8953-03.patch, HDFS-8953-04.patch, HDFS-8953-05.patch
>
>
> HDFS-8880 added metrics logging at NameNode. Similarly, this JIRA is to  add 
> a separate logger for metrics at DN



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