FAQ
The NN should determine its own hostname using the same method as the DN
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Key: HDFS-2193
URL: https://issues.apache.org/jira/browse/HDFS-2193
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node, security
Affects Versions: 0.23.0
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers


When the "{{_HOST}}" replacement feature of Kerberos principal names is used, the various Hadoop daemons must determine their own canonical hostname in order to form their principal name.

Presently, the NN determines its own hostname based on the configured value of "{{fs.default.name}}", whereas the DNs determine their hostnames based on the result of "{{InetAddress.getLocalHost().getCanonicalHostName()}}". This asymmetry can cause confusion during configuration of a secure cluster.

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postedJul 25, '11 at 9:10p
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