[jira] [Commented] (HDFS-11034) Provide a command line tool to clear decommissioned DataNode information from the NameNode without restarting.

["Chris Nauroth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-11034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15589341#comment-15589341 ] 

Chris Nauroth commented on HDFS-11034:
--------------------------------------

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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