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stevel pushed a commit to branch branch-3.2
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The following commit(s) were added to refs/heads/branch-3.2 by this push:
     new edad6f1  HADOOP-16847. Test can fail if HashSet iterates in a 
different order.
edad6f1 is described below

commit edad6f1d0f193cf0bd3eddd1f33bed7cdff6880e
Author: testfixer <60407054+testfi...@users.noreply.github.com>
AuthorDate: Tue Feb 11 05:22:07 2020 -0600

    HADOOP-16847. Test can fail if HashSet iterates in a different order.
    
    
    Contributed by Testfixer
---
 .../src/test/java/org/apache/hadoop/security/TestGroupsCaching.java    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git 
a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
 
b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
index bba8152..6945568 100644
--- 
a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
+++ 
b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
@@ -22,6 +22,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
+import java.util.LinkedHashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Set;
@@ -67,7 +68,7 @@ public class TestGroupsCaching {
 
   public static class FakeGroupMapping extends ShellBasedUnixGroupsMapping {
     // any to n mapping
-    private static Set<String> allGroups = new HashSet<String>();
+    private static Set<String> allGroups = new LinkedHashSet<String>();
     private static Set<String> blackList = new HashSet<String>();
     private static int requestCount = 0;
     private static long getGroupsDelayMs = 0;


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