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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16340431#comment-16340431
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Bharat Viswanadham commented on HADOOP-9747:
--------------------------------------------
Hi [~daryn]
Thank You for the patch.
I am going through the patch, have some questions when I am trying to
understand the code and also have some review comments.
* In hasKerberosCredential methods, add user!=null check, as it might throw
NPE, when user=null.
* In case of loginuserfromSubject, as we pass params as null to
doSubjectLogin, the configuration will be OS_SPECIFIC_LOGIN, but if it is a
subject which has keytab and principal, then how login happens. So, in this
case login fallbacks to Simple Auth login? Is this the expected behavior.
** @Override
public AppConfigurationEntry[] getAppConfigurationEntry(String appName) {
ArrayList<AppConfigurationEntry> entries = new ArrayList<>();
// login of external subject passes no params. technically only
// existing credentials should be used but other components expect
// the login to succeed with local user fallback if no principal.
if (params == null || appName.equals(SIMPLE_CONFIG_NAME)) {
entries.add(OS_SPECIFIC_LOGIN);
}
** So, the AppConfigEntry will have loginModule as OS_LOGIN_MODULE,
* renewTGT and refreshKrb5Config is not set in IBM_JAVA case, is there any
reason for this?
* @Test annotation is missing for tests in TestUGILoginFromKeytab.java
* Following 3 methods perform login and update the static loginUser. It might
make sense to add documentation that these update the global loginUser.
getLoginUser, loginUserFromSubject and loginUserFromKeytab
I am still going through patch, and still reviewing test cases. Will update if
I have more comments.
> Reduce unnecessary UGI synchronization
> --------------------------------------
>
> Key: HADOOP-9747
> URL: https://issues.apache.org/jira/browse/HADOOP-9747
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HADOOP-9747-trunk-03.patch, HADOOP-9747-trunk.01.patch,
> HADOOP-9747-trunk.02.patch, HADOOP-9747.2.branch-2.patch,
> HADOOP-9747.2.trunk.patch, HADOOP-9747.branch-2.patch, HADOOP-9747.trunk.patch
>
>
> Jstacks of heavily loaded NNs show up to dozens of threads blocking in the
> UGI.
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