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Date: Tue, 3 Jul 2012 12:45:21 +0000 (UTC)
From: "Harsh J (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <1285741462.42.1341319521019.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Resolved] (HDFS-1125) Removing a datanode (failed or
 decommissioned) should not require a namenode restart
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     [ https://issues.apache.org/jira/browse/HDFS-1125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Harsh J resolved HDFS-1125.
---------------------------

    Resolution: Duplicate

Resolved via HDFS-1773. It was in the version after the one Allen tried above I think, thats why he may not have seen it? Please reopen if not.
                
> Removing a datanode (failed or decommissioned) should not require a namenode restart
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-1125
>                 URL: https://issues.apache.org/jira/browse/HDFS-1125
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.20.2
>            Reporter: Alex Loddengaard
>            Priority: Blocker
>
> I've heard of several Hadoop users using dfsadmin -report to monitor the number of dead nodes, and alert if that number is not 0.  This mechanism tends to work pretty well, except when a node is decommissioned or fails, because then the namenode requires a restart for said node to be entirely removed from HDFS.  More details here:
> http://markmail.org/search/?q=decommissioned%20node%20showing%20up%20ad%20dead%20node%20in%20web%20based%09interface%20to%20namenode#query:decommissioned%20node%20showing%20up%20ad%20dead%20node%20in%20web%20based%09interface%20to%20namenode+page:1+mid:7gwqwdkobgfuszb4+state:results
> Removal from the exclude file and a refresh should get rid of the dead node.

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