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
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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