Thank yours response.
I am using hadoop-2.0.0-alpha from apache site.  In which version it should 
configure with HTTP/_h...@site.com?  I think not in hadoop-2.0.0-alpha. Because 
I login successful with other principal, pls refer below log:

2012-07-23 22:48:17,303 INFO 
org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler: 
Login using keytab /home/hdfs/keytab/nn.service.keytab, for principal 
nn/167-52-0-56.site@site
2012-07-23 22:48:17,310 INFO 
org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler: 
Initialized, principal [nn/167-52-0-56.site@site] from keytab 
[/home/hdfs/keytab/nn.service.keytab]


-----邮件原件-----
发件人: Arpit Gupta [mailto:ar...@hortonworks.com] 
发送时间: 2012年7月27日 9:22
收件人: common-dev@hadoop.apache.org
主题: Re: regarding _HOST token replacement in security hadoop

what version of hadoop are you using?

also

dfs.web.authentication.kerberos.principal should be set to HTTP/_h...@site.com

--
Arpit Gupta
Hortonworks Inc.
http://hortonworks.com/

On Jul 26, 2012, at 6:11 PM, Wangwenli <wangwe...@huawei.com> wrote:

> Hi all,
> 
>   I configured like below in hdfs-site.xml:
> 
> <property>
>  <name>dfs.namenode.kerberos.principal</name>
>  <value>nn/_HOST@site</value>
> </property>
> 
> 
> <property>
>    <name>dfs.web.authentication.kerberos.principal</name>
>    <value>nn/_HOST@site</value>
> </property>
> 
> 
>   When  start up namenode, I found, namenode will use principal : 
> nn/167-52-0-56@site to login, but the http server will use 
> nn/167-52-0-56.site@site<mailto:nn/167-52-0-56.site@site> to lgin,  so it 
> start failed.
> 
> I checked the code,
> 
> Namenode will use socAddr.getHostName() to get hostname in 
> org.apache.hadoop.hdfs.server.namenode.NameNode.loginAsNameNodeUser.
> 
> 
> But httpserver 's default hostname is 0.0.0.0, so in 
> org.apache.hadoop.security.SecurityUtil.replacePattern, it will get the 
> hostname by invoking getLocalHostName,there it use getCanonicalHostName(),
> 
> I think this inconsistent is wrong,  can someone confirm this? Need raise one 
> bug ? 
> 
> Thanks
> 

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