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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6397) topology script called with host names instead of IP addresses
Date Mon, 30 Nov 2009 10:37:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783599#action_12783599

Steve Loughran commented on HADOOP-6397:

Well spotted. Assuming that any hostname beginning with a-f is hex is not that sensible.

I thought initially that this would be trivial to write tests for, but of course, it depends
on DNS working and the hostname passed in resolving. 

> 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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