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Date: Thu, 29 Sep 2011 21:43:45 +0000 (UTC)
From: "Jonathan Hsieh (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (HBASE-4515) User.getCurrent() can cause NPE.
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     [ https://issues.apache.org/jira/browse/HBASE-4515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Hsieh updated HBASE-4515:
----------------------------------

    Attachment: 0001-HBASE-4515-User.getCurrent-can-cause-NPE.patch
    
> User.getCurrent() can cause NPE.
> --------------------------------
>
>                 Key: HBASE-4515
>                 URL: https://issues.apache.org/jira/browse/HBASE-4515
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.0, 0.94.0
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>         Attachments: 0001-HBASE-4515-User.getCurrent-can-cause-NPE.patch
>
>
> When testing with miniclusters that shutdown and are restarted, sometimes a call to User.getCurrent().getName() NPEs when attempting to restart hbase.  Oddly this happens consistently on particular branches and not on others. I don't know or understand why this happens but it has something to do with the getCurrentUGI call in  o.a.h.h.security.User.HadoopUser sometimes returning null and sometimes returning data.
> {code}
>    private HadoopUser() {
>       try {
>         ugi = (UserGroupInformation) callStatic("getCurrentUGI");
>         if (ugi == null) {
>           LOG.warn("Although successfully retrieved UserGroupInformation" 
>               + "  it was null!");
>         }
>       } catch (RuntimeException re) {
> {code}
> This patch essentially is a workaround -- it propagates the null so that clients can check and avoid the NPE.

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