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https://issues.apache.org/jira/browse/HDFS-16017?focusedWorklogId=594094&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-594094
 ]

ASF GitHub Bot logged work on HDFS-16017:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/May/21 16:31
            Start Date: 10/May/21 16:31
    Worklog Time Spent: 10m 
      Work Description: goiri commented on a change in pull request #2993:
URL: https://github.com/apache/hadoop/pull/2993#discussion_r629504887



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpc.java
##########
@@ -513,6 +513,44 @@ public void testProxyListFilesLargeDir() throws 
IOException {
     }
   }
 
+  @Test
+  public void testProxyListFilesWithOverwrite() throws IOException {
+    // Create a parent point as well as a subfolder mount
+    // /parent
+    //    ns0 -> /parent
+    // /parent/sub1
+    //    ns0 -> /parent/sub1
+    String parent = "/parent";
+    String sub1 = parent + "/sub1";
+    Path parentPath = new Path(parent);
+    // Add mount point
+    for (RouterContext rc : cluster.getRouters()) {
+      MockResolver resolver =
+          (MockResolver) rc.getRouter().getSubclusterResolver();
+      resolver.addLocation(parent, ns, parent);
+      resolver.addLocation(sub1, ns, sub1);
+    }
+    // The sub1 folder created is the same as the sub1 mount point directory
+    nnFS.mkdirs(new Path(sub1));
+
+    FileStatus[] routerFsResult = routerFS.listStatus(parentPath);
+    FileStatus[] nnFsResult = nnFS.listStatus(parentPath);
+    // Checking
+    assertEquals(1, routerFsResult.length);
+    assertEquals(1, nnFsResult.length);
+
+    FileStatus nnFileStatus = nnFsResult[0];
+    FileStatus routerFileStatus = routerFsResult[0];
+
+    assert nnFileStatus != null;

Review comment:
       Let's do a unit test assert instead.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 594094)
    Time Spent: 0.5h  (was: 20m)

> RBF: The getListing method should not overwrite the Listings returned by the 
> NameNode
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-16017
>                 URL: https://issues.apache.org/jira/browse/HDFS-16017
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.3.1
>            Reporter: zhu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Regarding the getListing method, when the directory returned by NameNode is a 
> mount point in MountTable, the list returned by Namenode shall prevail.



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