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https://issues.apache.org/jira/browse/HDFS-2086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054147#comment-13054147
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Hudson commented on HDFS-2086:
------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #755 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/755/])
    HDFS-2086. If the include hosts list contains host names, after restarting 
namenode, data nodes registration is denied.  Contributed by Tanping Wang.

tanping : 
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1139090
Files : 
* 
/hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hdfs/CHANGES.txt
* 
/hadoop/common/trunk/hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestStartup.java


> 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
>            Assignee: Tanping Wang
>             Fix For: 0.23.0
>
>         Attachments: HDFS-2086.2.patch, HDFS-2086.3.patch, HDFS-2086.4.patch, 
> HDFS-2086.5.patch, HDFS-2086.6.patch, HDFS-2086.7.patch, HDFS-2086.patch
>
>
> As the title 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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