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HADOOP-16707. NPE in UGI.getCurrentUser in ITestAbfsIdentityTransformer setup. 

Contributed by Steve Loughran.

Change-Id: I38fdba2fa70e534d78b15e61de19368912588b0c
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Steve Loughran 2019-11-20 14:32:12 +00:00 committed by GitHub
parent dfc61d8ea5
commit 1415ad3800
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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java
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@ -584,6 +584,7 @@ public class UserGroupInformation {
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation getCurrentUser() throws IOException {
ensureInitialized();
AccessControlContext context = AccessController.getContext();
Subject subject = Subject.getSubject(context);
if (subject == null || subject.getPrincipals(User.class).isEmpty()) {
@ -670,6 +671,7 @@ public class UserGroupInformation {
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation getLoginUser() throws IOException {
ensureInitialized();
UserGroupInformation loginUser = loginUserRef.get();
// a potential race condition exists only for the initial creation of
// the login user. there's no need to penalize all subsequent calls