ZanderXu opened a new pull request, #4821:
URL: https://github.com/apache/hadoop/pull/4821
### Description of PR
NameNode should use NameNode.getRemoteUser() to log audit event to avoid
possible NPE.
The relate code is:
```
private void logAuditEvent(boolean succeeded, String cmd, String src,
String dst, FileStatus stat) throws IOException {
if (isAuditEnabled() && isExternalInvocation()) {
logAuditEvent(succeeded, Server.getRemoteUser(), Server.getRemoteIp(),
cmd, src, dst, stat);
}
}
// the ugi may be null.
private void logAuditEvent(boolean succeeded,
UserGroupInformation ugi, InetAddress addr, String cmd, String src,
String dst, FileStatus status) {
final String ugiStr = ugi.toString();
...
}
```
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