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https://issues.apache.org/jira/browse/HDFS-11034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15589341#comment-15589341
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Chris Nauroth commented on HDFS-11034:
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We can add a new dfsadmin command to clear this state.
It's important to note that for some operations workflows, it's valuable to
retain the decommissioned node information. If the operator is working on a
series of decommission/recommission steps, then this information is valuable to
see which nodes are still remaining in decommissioned state. That likely means
that the command line needs to accept an argument for a specific host instead
of just blindly clearing all decommissioned node information.
Remember to clear from both NameNodes in an HA pair.
> 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
>
> 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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