HADOOP-18109. Ensure that default permissions of directories under internal ViewFS directories are the same as directories on target filesystems. Contributed by Chentao Yu. (3953)

(cherry picked from commit 19d90e62fb28539f8c79bbb24f703301489825a6)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java

@@ -1495,11 +1495,6 @@ public class ViewFileSystem extends FileSystem {
       throw readOnlyMountTable("mkdirs",  dir);
     }
 
-    @Override
-    public boolean mkdirs(Path dir) throws IOException {
-      return mkdirs(dir, null);
-    }
-
     @Override
     public FSDataInputStream open(Path f, int bufferSize)
         throws AccessControlException, FileNotFoundException, IOException {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemHdfs.java

@@ -479,4 +479,23 @@ public class TestViewFileSystemHdfs extends ViewFileSystemBaseTest {
     assertEquals("The owner did not match ", owner, userUgi.getShortUserName());
     otherfs.delete(user1Path, false);
   }
+
+  @Test
+  public void testInternalDirectoryPermissions() throws IOException {
+    LOG.info("Starting testInternalDirectoryPermissions!");
+    Configuration localConf = new Configuration(conf);
+    ConfigUtil.addLinkFallback(
+        localConf, new Path(targetTestRoot, "fallbackDir").toUri());
+    FileSystem fs = FileSystem.get(FsConstants.VIEWFS_URI, localConf);
+    // check that the default permissions on a sub-folder of an internal
+    // directory are the same as those created on non-internal directories.
+    Path subDirOfInternalDir = new Path("/internalDir/dir1");
+    fs.mkdirs(subDirOfInternalDir);
+
+    Path subDirOfRealDir = new Path("/internalDir/linkToDir2/dir1");
+    fs.mkdirs(subDirOfRealDir);
+
+    assertEquals(fs.getFileStatus(subDirOfInternalDir).getPermission(),
+        fs.getFileStatus(subDirOfRealDir).getPermission());
+  }
 }