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Date: Mon, 20 Jun 2011 21:58:47 +0000 (UTC)
From: "Tanping Wang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2086) If the include hosts list contains
 host name, after restarting namenode, datanodes registrant is denied
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    [ https://issues.apache.org/jira/browse/HDFS-2086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052244#comment-13052244 ] 

Tanping Wang commented on HDFS-2086:
------------------------------------

There is a second part of this problem. When namenode checks datanode status by calling 
FSNameSystem#getDatanodeListForReport 

The namenode goes over its include hosts list and tries to determine if all the hosts in the include list are all registrant. If not, the host will be added into the dead list. In our case, as just mentioned early, after the namenode restarted, datanode registrants itself with its *IP address*. But the include list still
contains its *host name*. So the hostname is not recognized by namenode and is added into the dead list when namenode reports the datanodes status.  

> If the include hosts list contains host name, after restarting namenode, datanodes registrant is denied 
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2086
>                 URL: https://issues.apache.org/jira/browse/HDFS-2086
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Tanping Wang
>             Fix For: 0.23.0
>
>
> As the tile describes the problem:  if the include host list contains host name, after restarting namenodes, the datanodes registrant is denied by namenodes.  This is because after namenode is restarted, the still alive data node will try to register itself with the namenode and it identifies itself with its *IP address*.  However, namenode only allows all the hosts in its hosts list to registrant and all of them are hostnames. So namenode would deny the datanode registration.

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