Kevin Minder created HADOOP-11699:
-------------------------------------
Summary: _HOST not consistently resolving to lowercase fully
qualified hostname
Key: HADOOP-11699
URL: https://issues.apache.org/jira/browse/HADOOP-11699
Project: Hadoop Common
Issue Type: Bug
Components: security
Affects Versions: 2.6.0
Reporter: Kevin Minder
The _HOST marker used for Kerberos principals in various configuration files
does not always return lowercase fully qualified hostnames. For example this
setting in hdfs-site.xml
{code}
<property>
<name>dfs.namenode.kerberos.principal</name>
<value>hdfs/_h...@yourrealm.com</value>
</property>
{code}
In particular, this is impeding our work to have Hadoop work with equivalent
security on Windows as on Linux.
In the windows env in which I'm having the issue, I was able to get a fully
qualified host name using this version of method getLocalHostName() in .
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SecurityUtil.java
{code:java}
public static String getLocalHostName() throws UnknownHostException {
String hostname = InetAddress.getLocalHost().getCanonicalHostName();
if ( !hostname.contains( "." ) ) {
final String os = System.getProperties().getProperty( "os.name", "?"
).toLowerCase();
if ( os.startsWith( "windows" ) ) {
String domain = System.getenv( "USERDNSDOMAIN" );
if ( domain != null ) {
hostname += "." + domain.trim();
}
}
}
return hostname == null ? "localhost" : hostname.toLowerCase();
}
{code}
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