szetszwo commented on a change in pull request #3340:
URL: https://github.com/apache/hadoop/pull/3340#discussion_r697772269



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectoryAttributes.java
##########
@@ -32,6 +32,11 @@
   public QuotaCounts getQuotaCounts();
 
   public boolean metadataEquals(INodeDirectoryAttributes other);
+
+  static boolean validateFeature(INode.Feature left, INode.Feature right) {
+    return (left == right ||
+        (left != null && right != null && left.equals(right)));
+  }

Review comment:
       This is the same as Objects.equals(..) so that it is not needed.
   

##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
##########
@@ -890,12 +890,14 @@ public void cleanSubtree(ReclaimContext reclaimContext, 
final int snapshotId,
    */
   @Override
   public boolean metadataEquals(INodeDirectoryAttributes other) {
-    return other != null
-        && getQuotaCounts().equals(other.getQuotaCounts())
+    return other != null && getQuotaCounts().equals(other.getQuotaCounts())
         && getPermissionLong() == other.getPermissionLong()
-        && getAclFeature() == other.getAclFeature()
-        && getXAttrFeature() == other.getXAttrFeature();
+        && INodeDirectoryAttributes
+        .validateFeature(getAclFeature(), other.getAclFeature())
+        && INodeDirectoryAttributes
+        .validateFeature(getXAttrFeature(), other.getXAttrFeature());

Review comment:
       Use Objects.equals(..), i.e.
   ```
           && Objects.equals(getAclFeature(), other.getAclFeature())
           && Objects.equals(getXAttrFeature(), other.getXAttrFeature());
   ```

##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectoryAttributes.java
##########
@@ -58,11 +63,12 @@ public boolean isDirectory() {
 
     @Override
     public boolean metadataEquals(INodeDirectoryAttributes other) {
-      return other != null
-          && getQuotaCounts().equals(other.getQuotaCounts())
+      return other != null && getQuotaCounts().equals(other.getQuotaCounts())
           && getPermissionLong() == other.getPermissionLong()
-          && getAclFeature() == other.getAclFeature()
-          && getXAttrFeature() == other.getXAttrFeature();
+          && INodeDirectoryAttributes
+          .validateFeature(getAclFeature(), other.getAclFeature())
+          && INodeDirectoryAttributes
+          .validateFeature(getXAttrFeature(), other.getXAttrFeature());

Review comment:
       Similar to before, use Objects.equals(..), i.e.
   ```
           && Objects.equals(getAclFeature(), other.getAclFeature())
           && Objects.equals(getXAttrFeature(), other.getXAttrFeature());
   ```
   




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