Hexiaoqiao commented on a change in pull request #2887:
URL: https://github.com/apache/hadoop/pull/2887#discussion_r631544089



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/NamenodeHeartbeatService.java
##########
@@ -170,7 +172,20 @@ protected void serviceInit(Configuration configuration) 
throws Exception {
 
   @Override
   public void periodicInvoke() {
-    updateState();
+    try {
+      SecurityUtil.doAsCurrentUser(
+          new PrivilegedExceptionAction<Object>() {

Review comment:
       Thanks @goiri and @bolerio for your comments. I am just concern if is it 
necessary to do as current user here because Router has login when start daemon 
and it is already execute with current login user. Do you meet some exception 
here? Thanks.




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