devmadhuu commented on code in PR #6318:
URL: https://github.com/apache/ozone/pull/6318#discussion_r1538774566


##########
hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryDiskUsageOrdering.java:
##########
@@ -0,0 +1,421 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.ozone.recon.api;
+
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.ozone.om.OMMetadataManager;
+import org.apache.hadoop.ozone.om.helpers.BucketLayout;
+import org.apache.hadoop.ozone.om.helpers.OmBucketInfo;
+import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
+import org.apache.hadoop.ozone.recon.api.types.DUResponse;
+
+import org.apache.hadoop.ozone.recon.spi.ReconNamespaceSummaryManager;
+import org.apache.hadoop.ozone.recon.spi.StorageContainerServiceProvider;
+import org.apache.hadoop.ozone.recon.spi.impl.OzoneManagerServiceProviderImpl;
+import 
org.apache.hadoop.ozone.recon.spi.impl.StorageContainerServiceProviderImpl;
+import org.apache.hadoop.ozone.recon.tasks.NSSummaryTaskWithFSO;
+import org.junit.jupiter.api.BeforeEach;
+import static 
org.apache.hadoop.ozone.recon.OMMetadataManagerTestUtils.getMockOzoneManagerServiceProviderWithFSO;
+import static 
org.apache.hadoop.ozone.recon.OMMetadataManagerTestUtils.getTestReconOmMetadataManager;
+import static 
org.apache.hadoop.ozone.recon.ReconServerConfigKeys.OZONE_RECON_NSSUMMARY_FLUSH_TO_DB_MAX_THRESHOLD;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.mock;
+import org.apache.hadoop.hdds.scm.container.ContainerManager;
+import org.apache.hadoop.hdds.scm.container.ContainerNotFoundException;
+import org.apache.hadoop.hdds.scm.server.OzoneStorageContainerManager;
+import org.apache.hadoop.ozone.om.OmMetadataManagerImpl;
+import org.apache.hadoop.ozone.recon.ReconTestInjector;
+import org.apache.hadoop.ozone.recon.recovery.ReconOMMetadataManager;
+import org.apache.hadoop.ozone.recon.scm.ReconNodeManager;
+import org.apache.hadoop.ozone.recon.scm.ReconStorageContainerManagerFacade;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import javax.ws.rs.core.Response;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.UUID;
+
+import static org.apache.hadoop.ozone.om.OMConfigKeys.OZONE_OM_DB_DIRS;
+import static 
org.apache.hadoop.ozone.recon.OMMetadataManagerTestUtils.writeDirToOm;
+import static 
org.apache.hadoop.ozone.recon.OMMetadataManagerTestUtils.writeKeyToOm;
+import static org.mockito.Mockito.when;
+
+/**
+ * Test NSSummary Disk Usage subpath ordering.
+ */
+public class TestNSSummaryDiskUsageOrdering {
+
+  @TempDir
+  private Path temporaryFolder;
+
+  private ReconOMMetadataManager reconOMMetadataManager;
+  private NSSummaryEndpoint nsSummaryEndpoint;
+  private OzoneConfiguration ozoneConfiguration;
+  private static final String ROOT_PATH = "/";
+  private static final String TEST_USER = "TestUser";
+  private OMMetadataManager omMetadataManager;
+  @BeforeEach
+  public void setUp() throws Exception {
+    ozoneConfiguration = new OzoneConfiguration();
+    ozoneConfiguration.setLong(OZONE_RECON_NSSUMMARY_FLUSH_TO_DB_MAX_THRESHOLD,
+        100);
+    omMetadataManager = initializeNewOmMetadataManager(
+        Files.createDirectory(temporaryFolder.resolve("JunitOmDBDir"))
+            .toFile());
+    OzoneManagerServiceProviderImpl ozoneManagerServiceProvider =
+        getMockOzoneManagerServiceProviderWithFSO();
+    reconOMMetadataManager = getTestReconOmMetadataManager(omMetadataManager,
+        
Files.createDirectory(temporaryFolder.resolve("OmMetataDir")).toFile());
+
+    ReconTestInjector reconTestInjector =
+        new ReconTestInjector.Builder(temporaryFolder.toFile())
+            .withReconOm(reconOMMetadataManager)
+            .withOmServiceProvider(ozoneManagerServiceProvider)
+            .withReconSqlDb()
+            .withContainerDB()
+            .addBinding(OzoneStorageContainerManager.class,
+                getMockReconSCM())
+            .addBinding(StorageContainerServiceProvider.class,
+                mock(StorageContainerServiceProviderImpl.class))
+            .addBinding(NSSummaryEndpoint.class)
+            .build();
+    ReconNamespaceSummaryManager reconNamespaceSummaryManager =
+        reconTestInjector.getInstance(ReconNamespaceSummaryManager.class);
+    nsSummaryEndpoint = reconTestInjector.getInstance(NSSummaryEndpoint.class);
+
+    // populate OM DB and reprocess into Recon RocksDB
+    populateOMDB();
+    NSSummaryTaskWithFSO nSSummaryTaskWithFso =
+        new NSSummaryTaskWithFSO(reconNamespaceSummaryManager,
+            reconOMMetadataManager, ozoneConfiguration);
+    nSSummaryTaskWithFso.reprocessWithFSO(reconOMMetadataManager);
+  }
+
+  /**
+   * Create a new OM Metadata manager instance with one user, one vol, and two
+   * buckets.
+   * @throws IOException ioEx
+   */
+  private static OMMetadataManager initializeNewOmMetadataManager(
+      File omDbDir)
+      throws IOException {
+    OzoneConfiguration omConfiguration = new OzoneConfiguration();
+    omConfiguration.set(OZONE_OM_DB_DIRS,
+        omDbDir.getAbsolutePath());
+    OMMetadataManager omMetadataManager = new OmMetadataManagerImpl(
+        omConfiguration, null);
+    return omMetadataManager;
+  }
+
+  @Test
+  public void testDiskUsageOrderingForRoot() throws Exception {
+    // root level DU
+    // Verify the ordering of subpaths under the root
+    verifyOrdering(ROOT_PATH);
+  }
+
+  @Test
+  public void testDiskUsageOrderingForVolume() throws Exception {
+    // volume level DU
+    // Verify the ordering of subpaths under the volume
+    verifyOrdering("/volA");
+    verifyOrdering("/volB");
+  }
+
+  @Test
+  public void testDiskUsageOrderingForBucket() throws Exception {
+    // bucket level DU
+    // Verify the ordering of subpaths under the bucket
+    verifyOrdering("/volA/bucketA1");
+    verifyOrdering("/volA/bucketA2");
+    verifyOrdering("/volA/bucketA3");
+    verifyOrdering("/volB/bucketB1");
+  }
+
+  private void verifyOrdering(String path)
+      throws IOException {
+    Response response =
+        nsSummaryEndpoint.getDiskUsage(path, true, false, true);
+    DUResponse duRes = (DUResponse) response.getEntity();
+    List<DUResponse.DiskUsage> duData = duRes.getDuData();
+    List<DUResponse.DiskUsage> sortedDuData = new ArrayList<>(duData);
+    // Sort the DU data by size in descending order to compare with the 
original.
+    sortedDuData.sort(
+        Comparator.comparingLong(DUResponse.DiskUsage::getSize).reversed());

Review Comment:
   Ok thanks @ArafatKhan2198 for explaining in detail. Its ok to have it this 
way. 



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