Package org.apache.storm.utils
Class HadoopLoginUtil
java.lang.Object
org.apache.storm.utils.HadoopLoginUtil
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.
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptionstatic SubjectloginHadoop(Map<String, Object> conf) Login if a HDFS keytab/principal have been supplied; otherwise, assume it's already logged in or running on insecure HDFS.
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Constructor Details- 
HadoopLoginUtilpublic HadoopLoginUtil()
 
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Method Details- 
loginHadoopLogin 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.- Parameters:
- conf- the daemon conf
- Returns:
- the logged in subject or null
 
 
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