FAQ
topology script called with host names instead of IP addresses
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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


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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postedNov 29, '09 at 6:38p
activeNov 29, '09 at 6:38p
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