Mailing-List: contact hadoop-dev-help@lucene.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hadoop-dev@lucene.apache.org
Message-ID: <28818520.1146782418401.JavaMail.jira@brutus>
Date: Thu, 4 May 2006 22:40:18 +0000 (GMT+00:00)
From: "alan wootton (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Created: (HADOOP-197) Hook
 InetAddress.getLocalHost().getHostName() to support cluster simulatation.
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Hook InetAddress.getLocalHost().getHostName() to support cluster simulatation.
------------------------------------------------------------------------------

         Key: HADOOP-197
         URL: http://issues.apache.org/jira/browse/HADOOP-197
     Project: Hadoop
        Type: Improvement

  Components: dfs, mapred  
 Environment: all
    Reporter: alan wootton
    Priority: Minor
 Attachments: InetAddressWrapper.patch

I have been running a simulation for weeks now (and also a 30 machine crawl). To make it work I need to sometimes 
let DataNodes, and TaskTrackers think they have a different machine-name than the one in InetAddress.getLocalHost()

The patch is:

1) replace InetAddress.getLocalHost().getHostName() with xxxx
	1.a)xxxx could be "conf.get("inetaddress.localhost.name",InetAddress.getLocalHost().getHostName())"
	1.b)or, xxxx could be a static call, I chose the latter: "InetAddressWrapper.getLocalHostName(conf)"
2) InetAddressWrapper.getLocalHostName(conf) checks the config for a hostname, and then calls InetAddress.getLocalHost().getHostName()

There's 3 places where it happens:
DataNode
DFSClient
TaskTracker

I did not patch the two tests that call InetAddress because they are not really using hostname.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira