HDFS-8693. Addendum patch to execute the command using UGI. Contributed by 
Brahma Reddy Battula.

(cherry picked from commit 35c17351cab645dcc72e0d2ae1608507aa787ffb)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/fb088564
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/fb088564
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/fb088564

Branch: refs/heads/branch-3.1
Commit: fb088564a2cb2637ab2d1644357c8faa0f4964df
Parents: aad3958
Author: Brahma Reddy Battula <bra...@apache.org>
Authored: Mon Feb 12 22:14:34 2018 +0530
Committer: Brahma Reddy Battula <bra...@apache.org>
Committed: Mon Feb 12 22:16:41 2018 +0530

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 .../hdfs/server/datanode/BlockPoolManager.java       | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/fb088564/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
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diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
index f6a11c2..141550e 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
@@ -253,7 +253,20 @@ class BlockPoolManager {
           lifelineAddrs.add(nnIdToLifelineAddr != null ?
               nnIdToLifelineAddr.get(nnId) : null);
         }
-        bpos.refreshNNList(addrs, lifelineAddrs);
+        try {
+          UserGroupInformation.getLoginUser()
+              .doAs(new PrivilegedExceptionAction<Object>() {
+                @Override
+                public Object run() throws Exception {
+                  bpos.refreshNNList(addrs, lifelineAddrs);
+                  return null;
+                }
+              });
+        } catch (InterruptedException ex) {
+          IOException ioe = new IOException();
+          ioe.initCause(ex.getCause());
+          throw ioe;
+        }
       }
     }
   }


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