HADOOP-10581. TestUserGroupInformation#testGetServerSideGroups fails. Contributed by Mit Desai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1593357 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -458,6 +458,10 @@ Release 2.5.0 - UNRELEASED
     HADOOP-10517. InputStream is not closed in two methods of JarFinder.
     (Ted Yu via cnauroth)
 
+    HADOOP-10581. TestUserGroupInformation#testGetServerSideGroups fails
+    because groups stored in Set and ArrayList are compared. 
+    (Mit Desai via kihwal)
+
 Release 2.4.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUserGroupInformation.java

@@ -17,7 +17,6 @@
 package org.apache.hadoop.security;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.metrics2.MetricsRecordBuilder;
 import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
@@ -36,9 +35,8 @@ import java.io.IOException;
 import java.io.InputStreamReader;
 import java.lang.reflect.Method;
 import java.security.PrivilegedExceptionAction;
+import java.util.ArrayList;
 import java.util.Collection;
-import java.util.LinkedHashSet;
-import java.util.Set;
 
 import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_USER_GROUP_METRICS_PERCENTILES_INTERVALS;
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTH_TO_LOCAL;
@@ -208,7 +206,7 @@ public class TestUserGroupInformation {
 
     System.out.println(userName + ":" + line);
    
-    Set<String> groups = new LinkedHashSet<String> ();    
+    ArrayList<String> groups = new ArrayList<String> ();    
     String[] tokens = line.split(Shell.TOKEN_SEPARATOR_REGEX);
     for(String s: tokens) {
       groups.add(s);