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Date: Sun, 29 Nov 2009 18:42:20 +0000 (UTC)
From: "Christian Kunz (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-6397) topology script called with host
 names instead of IP addresses
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     [ https://issues.apache.org/jira/browse/HADOOP-6397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christian Kunz updated HADOOP-6397:
-----------------------------------

    Attachment: HADOOP-6397.patch

Patch for trunk. Works for hadoop-0.20.1 when in the file names java is replaced by core.

> topology script called with host names instead of IP addresses
> --------------------------------------------------------------
>
>                 Key: HADOOP-6397
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6397
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.20.1
>            Reporter: Christian Kunz
>         Attachments: HADOOP-6397.patch
>
>
> According to the 'Hadoop Rack Awareness' section on http://hadoop.apache.org/common/docs/r0.20.0/cluster_setup.html the script/program topology.script.file.name can assume that names are passed in as IP addresses.
> This seems to work for hdfs, but the rack-awareness of the JobTracker does not always work, depending on the hostnames of the cluster, because of a bug in the method normalizeHostName of org.apache.hadoop.net.NetUtils.java:
> It returns the host name as-is when it decides that the string passed-in is already an IP but actually it checks whether the string starts with a valid hex character!
> There is no need to check at all, because InetAddress.getByName is smart enough to not do a dns lookup when the name is an IP address.

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