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From "Lorenzo Thione (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-497) DataNodes and TaskTrackers should be able to report hostnames and ips relative to customizable network interfaces and nameservers
Date Fri, 01 Sep 2006 07:29:23 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-497?page=comments#action_12432081 ] 
Lorenzo Thione commented on HADOOP-497:

Just setting sun.net.spi.nameservice.nameservers worked for direct lookup but not for reverse
lookup, at least when I first looked at it. This new patch does the job without using an external
library, just using JNDI directly to query the DNS server. The new class  has a new name (DNS.java)
, and a new location (net) . A new package.html file was created as well.  Finally, now network
interface and nameserver are independently configurable for datanodes and tasktrackers. The
names of the new properties have been changed to 


> DataNodes and TaskTrackers should be able to report hostnames and ips relative to customizable
network interfaces and nameservers
> ---------------------------------------------------------------------------------------------------------------------------------
>                 Key: HADOOP-497
>                 URL: http://issues.apache.org/jira/browse/HADOOP-497
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred, dfs, util
>    Affects Versions: 0.6.0
>            Reporter: Lorenzo Thione
>            Priority: Minor
>         Attachments: dnsjava-2.0.2.jar, net-dns.patch, nif-utils.patch
> This patch allows for network configuration parameters to be aded to the hadoop-site.xml
file. These parameters specify a network interface name and an optional nameserver hostname
which DataNodes and TaskTrackers consult to resolve  their hostnames from the IP bound to
the specified network interface.
> This is useful when machines that are part of different physical or logical network need
to participate in hadoop clusters as client nodes. The hostname and IP reported by InetAddress.getLocalHost()
are not necessarily the ones that will allow the JobTracker and NameNode to reach the clients,
as well as not necessarily the ones through which the DFS clients can reach the DataNodes.
> The configuration parameters are
>  - cluster.report.nif
>  - cluster.report.ns
> nif: takes the name of a network interface, like en0, en1 (on macs), eth0, etc...
> ns: the host name of a DNS server to use when resolving the IP bound to the specified
> These parameters are set by default to the value "default" which will replicate the current
behavior of reporting InetAddress.getLocalHost().getHostName() and getHostAddress()
> As part of the patch, a new library dnsjava was added along with its license information
(BSD license). The list of affected files is:
> src
>  org.apache.hadoop.dfs.DataNode 
>  org.apache.hadoop.mapred.taskTracker 
>  org.apache.hadoop.util.NetworkUtils
> conf
>  hadoop-default.xml
> lib
>  dnsjava-2.0.2.jar
>  dnsjava-2.0.2.LICENSE.txt

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