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https://issues.apache.org/jira/browse/HDFS-11034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16173117#comment-16173117
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Brahma Reddy Battula commented on HDFS-11034:
---------------------------------------------

can we add one argument to {{hdfs dfsadmin -refreshNodes}} itself instead of 
new admin command..? 
May be something like {{clearDeadNodes}}..?

> Provide a command line tool to clear decommissioned DataNode information from 
> the NameNode without restarting.
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11034
>                 URL: https://issues.apache.org/jira/browse/HDFS-11034
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Chris Nauroth
>            Assignee: Gergely Novák
>
> Information about decommissioned DataNodes remains tracked in the NameNode 
> for the entire NameNode process lifetime.  Currently, the only way to clear 
> this information is to restart the NameNode.  This issue proposes to add a 
> way to clear this information online, without requiring a process restart.



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