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https://issues.apache.org/jira/browse/HADOOP-13805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15653489#comment-15653489
]
Alejandro Abdelnur commented on HADOOP-13805:
---------------------------------------------
A quick way to verify the proposed solution work is using running the following
snippet and wait until the TGT expires:
{code}
UserGroupInformation.setShouldRenewImmediatelyForTests(true);
UserGroupInformation.loginUserFromSubject(subject);
UserGroupInformation ugi = UserGroupInformation.getLoginUser();
for (int i = 0; i < 100; i++) {
System.out.printf("*******Into %dsecs\n", i * 30*1000);
ugi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws Exception {
URI uri = new URI("kms://http@localhost:16000/kms");
KMSClientProvider provider = (KMSClientProvider) new
KMSClientProvider.Factory().createProvider(uri, hConf);
System.out.println(provider.getKeys());
return null;
}
});
for (int j = 0; j < 30; j++) {
System.out.println("! " + j);
System.out.flush();
Thread.sleep(1000);
}
System.out.println();
}
{code}
> UGI.getCurrentUser() fails if user does not have a keytab associated
> --------------------------------------------------------------------
>
> Key: HADOOP-13805
> URL: https://issues.apache.org/jira/browse/HADOOP-13805
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.8.0, 2.9.0, 3.0.0-alpha2
> Reporter: Alejandro Abdelnur
> Priority: Blocker
>
> HADOOP-13558 intention was to avoid UGI from trying to renew the TGT when the
> UGI is created from an existing Subject as in that case the keytab is not
> 'own' by UGI but by the creator of the Subject.
> In HADOOP-13558 we introduced a new private UGI constructor
> {{UserGroupInformation(Subject subject, final boolean externalKeyTab)}} and
> we use with TRUE only when doing a {{UGI.loginUserFromSubject()}}.
> The problem is, when we call {{UGI.getCurrentUser()}}, and UGI was created
> via a Subject (via the {{UGI.loginUserFromSubject()}} method), we call {{new
> UserGroupInformation(subject)}} which will delegate to
> {{UserGroupInformation(Subject subject, final boolean externalKeyTab)}} and
> that will use externalKeyTab == *FALSE*.
> Then the UGI returned by {{UGI.getCurrentUser()}} will attempt to login using
> a non-existing keytab if the TGT expired.
> This problem is experienced in {{KMSClientProvider}} when used by the HDFS
> filesystem client accessing an an encryption zone.
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