public class HadoopLoginUtil extends Object
UserGroupInformation#loginUserFromKeytab(String, String) changes the static fields of UserGroupInformation, especially the current logged-in user, and UserGroupInformation itself is not thread-safe. So it could introduce bugs if it is called multiple times in a JVM process. HadoopLoginUtil.loginHadoop guarantees at-most-once login in a JVM process. This should only be used on the daemon side.
|Constructor and Description|
|Modifier and Type||Method and Description|
Login if a HDFS keytab/principal have been supplied; otherwise, assume it’s already logged in or running on insecure HDFS.
Login if a HDFS keytab/principal have been supplied; otherwise, assume it’s already logged in or running on insecure HDFS. This also guarantees that login only happens at most once.
conf- the daemon conf
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