cxorm commented on a change in pull request #94: HDDS-2255. Improve Acl Handler 
Messages
URL: https://github.com/apache/hadoop-ozone/pull/94#discussion_r340429508
 
 

 ##########
 File path: 
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/web/ozShell/keys/AddAclKeyHandler.java
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 @@ -91,10 +91,15 @@ public Void call() throws Exception {
             OzoneObj.StoreType.valueOf(storeType))
         .build();
 
-    boolean result = client.getObjectStore().addAcl(obj,
+    boolean aclExisted = client.getObjectStore().checkAclExist(obj,
         OzoneAcl.parseAcl(acl));
-
-    System.out.printf("%s%n", "Acl added successfully: " + result);
+    if (aclExisted) {
+      System.out.println("ACL already exists.");
+    } else {
+      boolean result = client.getObjectStore().addAcl(obj,
 
 Review comment:
   Thanks @bharatviswa504 
   
   Sorry for last comment.
   I found that
   
   ```ozone sh vol setacl --acls=user:newUser:wr,user:newUser:w,user:newUser:r 
/vol``` 
   will return ```false``` for the already existed acl.
   
   ```ozone sh bucket setacl 
--acls=user:newUser:wr,user:newUser:w,user:newUser:r /vol/buc```
   will return ```true```
   
   ```ozone sh key setacl --acls=user:newUser:wr,user:newUser:w,user:newUser:r 
/vol/buc/ikey```
   will return ```true```
   
   So I update the ```SetAclVolumeHandler```.
   
   Could we fix the ```SetAclBucketHandler``` &```SetAclKeyHandler``` to show 
the right message for the existed acl ?
   

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