HADOOP-12567. NPE in SaslRpcServer. Contributed by Sergey Shelukhin.

(cherry picked from commit 7fab5c8cec0d2ab62acf50b7c33351fb69c8c187)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/397836a7
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/397836a7
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/397836a7

Branch: refs/heads/branch-2
Commit: 397836a7b3a8c0242c8032a6097a99aa161a638d
Parents: d8e6008
Author: cnauroth <[email protected]>
Authored: Tue Nov 17 15:59:57 2015 -0800
Committer: cnauroth <[email protected]>
Committed: Tue Nov 17 16:00:33 2015 -0800

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 hadoop-common-project/hadoop-common/CHANGES.txt                 | 2 ++
 .../src/main/java/org/apache/hadoop/security/SaslRpcServer.java | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/397836a7/hadoop-common-project/hadoop-common/CHANGES.txt
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diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt 
b/hadoop-common-project/hadoop-common/CHANGES.txt
index 6333c19..863f4fb 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -705,6 +705,8 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12560: Fix sprintf warnings in {{DomainSocket.c}} introduced by
     HADOOP-12344 (Mingliang Liu via Colin P. McCabe)
 
+    HADOOP-12567: NPE in SaslRpcServer (Sergey Shelukhin via cnauroth)
+
   OPTIMIZATIONS
 
     HADOOP-12051. ProtobufRpcEngine.invoke() should use Exception.toString()

http://git-wip-us.apache.org/repos/asf/hadoop/blob/397836a7/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcServer.java
----------------------------------------------------------------------
diff --git 
a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcServer.java
 
b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcServer.java
index f2b21e8..50acc5c 100644
--- 
a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcServer.java
+++ 
b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcServer.java
@@ -322,8 +322,9 @@ public class SaslRpcServer {
         }
         if (ac.isAuthorized()) {
           if (LOG.isDebugEnabled()) {
-            String username =
-              getIdentifier(authzid, secretManager).getUser().getUserName();
+            UserGroupInformation logUser =
+              getIdentifier(authzid, secretManager).getUser();
+            String username = logUser == null ? null : logUser.getUserName();
             LOG.debug("SASL server DIGEST-MD5 callback: setting "
                 + "canonicalized client ID: " + username);
           }

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