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https://issues.apache.org/jira/browse/HADOOP-11699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355772#comment-14355772
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Chris Nauroth commented on HADOOP-11699:
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[~jnp], thanks for pointing that out. In that case, it seems like
{{SecurityUtil#getLocalHostName}} ought to return lower case in all
environments, not just Windows, for agreement with
{{KerberosUtil#getServicePrincipal}}. Also, we should use
{{StringUtils#toLowerCase}} for the correct locale handling.
> _HOST not consistently resolving to lowercase fully qualified hostname on
> Windows
> ---------------------------------------------------------------------------------
>
> 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
> Assignee: Brahma Reddy Battula
>
> 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/[email protected]</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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