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Posted to common-issues@hadoop.apache.org by "Christian Kunz (JIRA)" <ji...@apache.org> on 2009/11/29 19:42:20 UTC
[jira] Updated: (HADOOP-6397) topology script called with host
names instead of IP addresses
[ 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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