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From: Bryan Duxbury <bryan@rapleaf.com>
Subject: Re: HBase region server id problem with ipv6 address
Date: Mon, 28 Apr 2008 09:45:48 -0700
To: hbase-user@hadoop.apache.org
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Zhou,

Can you create an issue and post a patch of the changes you made?

-Bryan

On Apr 28, 2008, at 9:42 AM, Zhou wrote:

> Hi,
>
> I've met a problem startup HBase.
>
> I setup hbase with hdfs,
> My server's network card has a ipv4 address and also a ipv6 address.
>
> When I first startup hbase with default configuration file,
> I found that the region server can't
> register to master. And I found lots of 127.0.0.1 in log.
>
> So I suppose interface "default" would not work and add following:
>
> <property>
>   <name>dfs.datanode.dns.interface</name>
>   <value>eth0</value>
>   <description>The name of the Network Interface from which a data  
> node should
>   report its IP address.
>   </description>
>  </property>
>
> However, when this is done. HBase master crashes;
> And I see ipv6 addresses in the log.
>
> So I dig into the source code,
> found that HBase fails to deal with IPv6 address.
>
> Details is in following:
> In class  org.apache.hadoop.hbase.HRegionServer
> the method getThisIP() invoke the method of class belongs to Hadoop- 
> core package
> The class is: org.apache.hadoop.net.DNS
> the method is: getDefaultIP(String strInterface)
> This method invokes another method in the same class: getIPs(String  
> strInterface)
> Method getIPs always returns the first ip address  no matter it is  
> ipv4 or ipv6
>
> I have fixed it by modifying method of  
> org.apache.hadoop.net.DNS.getIPs(String
> strInterface)
> Such that it always returns ipv4 address
> It is working now for me.
> But when hadoop upgrades, I have to modify again.
>
> I hope that HBase can fix this problem.
>
> Many thanks,
>
> Zhou
>
>