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https://issues.apache.org/jira/browse/HDFS-2086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tanping Wang updated HDFS-2086:
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    Description: 
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.


  was:
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.



> 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
>
>
> 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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