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https://issues.apache.org/jira/browse/HDFS-12004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063279#comment-16063279
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Kihwal Lee commented on HDFS-12004:
-----------------------------------
I thought it was fixed in HDFS-8950.
> Namenode UI continues to list DNs that have been removed from include and
> exclude
> ---------------------------------------------------------------------------------
>
> Key: HDFS-12004
> URL: https://issues.apache.org/jira/browse/HDFS-12004
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.3.0
> Reporter: Erik Krogen
> Priority: Minor
>
> Initially in HDFS, after a DN was decommission and subsequently removed from
> the exclude file (thus removing all references to it), it would still appear
> in the NN UI as a "dead" node until the NN was restarted. In HDFS-1773,
> discussion about this was had, and it was decided that the web UI should not
> show these nodes. However when HDFS-5334 went through and the NN web UI was
> reimplemented client-side, the behavior reverted back to pre-HDFS-1773, and
> dead+decommissioned nodes once again showed in the dead list. This can be
> operationally confusing for the same reasons as discussed in HDFS-1773.
> I would like to open this discussion to determine if the regression was
> intentional or if we should carry forward the logic implemented HDFS-1773
> into the new UI.
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