HDFS-14665. HttpFS: LISTSTATUS response is missing HDFS-specific fields (#1291) Contributed by Siyao Meng.

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java

@@ -174,7 +174,10 @@ public class HttpFSFileSystem extends FileSystem
   public static final String ACCESS_TIME_JSON = "accessTime";
   public static final String MODIFICATION_TIME_JSON = "modificationTime";
   public static final String BLOCK_SIZE_JSON = "blockSize";
+  public static final String CHILDREN_NUM_JSON = "childrenNum";
+  public static final String FILE_ID_JSON = "fileId";
   public static final String REPLICATION_JSON = "replication";
+  public static final String STORAGEPOLICY_JSON = "storagePolicy";
   public static final String XATTRS_JSON = "XAttrs";
   public static final String XATTR_NAME_JSON = "name";
   public static final String XATTR_VALUE_JSON = "value";

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java

@@ -37,6 +37,7 @@ import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.lib.service.FileSystemAccess;
 import org.apache.hadoop.util.StringUtils;
@@ -114,6 +115,16 @@ public class FSOperations {
         fileStatus.getModificationTime());
     json.put(HttpFSFileSystem.BLOCK_SIZE_JSON, fileStatus.getBlockSize());
     json.put(HttpFSFileSystem.REPLICATION_JSON, fileStatus.getReplication());
+    if (fileStatus instanceof HdfsFileStatus) {
+      // Add HDFS-specific fields to response
+      HdfsFileStatus hdfsFileStatus = (HdfsFileStatus) fileStatus;
+      json.put(HttpFSFileSystem.CHILDREN_NUM_JSON,
+          hdfsFileStatus.getChildrenNum());
+      json.put(HttpFSFileSystem.FILE_ID_JSON,
+          hdfsFileStatus.getFileId());
+      json.put(HttpFSFileSystem.STORAGEPOLICY_JSON,
+          hdfsFileStatus.getStoragePolicy());
+    }
     if (fileStatus.getPermission().getAclBit()) {
       json.put(HttpFSFileSystem.ACL_BIT_JSON, true);
     }

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/BaseTestHttpFSWith.java

@@ -43,6 +43,7 @@ import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.test.HFSTestCase;
 import org.apache.hadoop.test.HadoopUsersConfTestHelper;
@@ -345,6 +346,7 @@ public abstract class BaseTestHttpFSWith extends HFSTestCase {
 
   private void testListStatus() throws Exception {
     FileSystem fs = FileSystem.get(getProxiedFSConf());
+    boolean isDFS = fs instanceof DistributedFileSystem;
     Path path = new Path(getProxiedFSTestDir(), "foo.txt");
     OutputStream os = fs.create(path);
     os.write(1);
@@ -366,6 +368,18 @@ public abstract class BaseTestHttpFSWith extends HFSTestCase {
     assertEquals(status2.getOwner(), status1.getOwner());
     assertEquals(status2.getGroup(), status1.getGroup());
     assertEquals(status2.getLen(), status1.getLen());
+    if (isDFS && status2 instanceof HdfsFileStatus) {
+      assertTrue(status1 instanceof HdfsFileStatus);
+      HdfsFileStatus hdfsFileStatus1 = (HdfsFileStatus) status1;
+      HdfsFileStatus hdfsFileStatus2 = (HdfsFileStatus) status2;
+      // Check HDFS-specific fields
+      assertEquals(hdfsFileStatus2.getChildrenNum(),
+          hdfsFileStatus1.getChildrenNum());
+      assertEquals(hdfsFileStatus2.getFileId(),
+          hdfsFileStatus1.getFileId());
+      assertEquals(hdfsFileStatus2.getStoragePolicy(),
+          hdfsFileStatus1.getStoragePolicy());
+    }
 
     FileStatus[] stati = fs.listStatus(path.getParent());
     assertEquals(1, stati.length);