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From Gergely Novák (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HDFS-11034) Provide a command line tool to clear decommissioned DataNode information from the NameNode without restarting.
Date Tue, 25 Oct 2016 11:04:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604985#comment-15604985
] 

Gergely Novák commented on HDFS-11034:
--------------------------------------

I'm new here. [~cnauroth] could you please explain to me the difference between this expected
new dfsadmin command and removing the decommissioned datanode(s) from the {{dfs.hosts}} file
and executing {{hdfs dfsadmin -refreshNodes}}? Thank you.

> 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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