Ahad Rana created HADOOP-8919:
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Summary: Namenode Kerberos Login does not use proper hostname for
host qualified hdfs principal name.
Key: HADOOP-8919
URL: https://issues.apache.org/jira/browse/HADOOP-8919
Project: Hadoop Common
Issue Type: Bug
Components: security
Affects Versions: 2.0.2-alpha, 2.0.1-alpha, 2.0.0-alpha, 2.0.3-alpha
Environment: CDH4U1 using Kerberos on Ubuntu 12.01
Reporter: Ahad Rana
The Namenode uses the loginAsNameNodeUser method in NameNode.java to login
using the hdfs principal. This method in turn invokes SecurityUtil.login with a
hostname (last parameter) obtained via a call to InetAddress.getHostName. This
call does not always return the fully qualified host name, and thus causes the
namenode to login to fail due to kerberos's inability to find a matching hdfs
principal in the hdfs.keytab file. Instead it should use
InetAddress.getCanonicalHostName. This is consistent with what is used
internally by SecurityUtil.java to login in other services, such as the
DataNode.
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