adoroszlai commented on code in PR #9326:
URL: https://github.com/apache/ozone/pull/9326#discussion_r2579755980


##########
hadoop-ozone/integration-test-recon/src/test/java/org/apache/hadoop/ozone/recon/TestStorageDistributionEndpoint.java:
##########
@@ -0,0 +1,289 @@
+/*
+ * 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
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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;
+
+import static 
org.apache.hadoop.hdds.HddsConfigKeys.HDDS_CONTAINER_REPORT_INTERVAL;
+import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_HEARTBEAT_INTERVAL;
+import static 
org.apache.hadoop.hdds.HddsConfigKeys.HDDS_SCM_WAIT_TIME_AFTER_SAFE_MODE_EXIT;
+import static org.apache.hadoop.hdds.client.ReplicationFactor.THREE;
+import static org.apache.hadoop.hdds.client.ReplicationType.RATIS;
+import static 
org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_HA_RATIS_SNAPSHOT_GAP;
+import static 
org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_HEARTBEAT_PROCESS_INTERVAL;
+import static 
org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_BLOCK_DELETING_SERVICE_INTERVAL;
+import static 
org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_BLOCK_DELETING_SERVICE_TIMEOUT;
+import static 
org.apache.hadoop.ozone.recon.TestReconEndpointUtil.getReconWebAddress;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.time.Duration;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdds.client.BlockID;
+import org.apache.hadoop.hdds.client.DefaultReplicationConfig;
+import org.apache.hadoop.hdds.client.ReplicationConfig;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.scm.ScmConfig;
+import org.apache.hadoop.hdds.scm.server.StorageContainerManager;
+import org.apache.hadoop.hdds.utils.IOUtils;
+import org.apache.hadoop.ozone.HddsDatanodeService;
+import org.apache.hadoop.ozone.MiniOzoneCluster;
+import org.apache.hadoop.ozone.OzoneConsts;
+import org.apache.hadoop.ozone.client.BucketArgs;
+import org.apache.hadoop.ozone.client.ObjectStore;
+import org.apache.hadoop.ozone.client.OzoneBucket;
+import org.apache.hadoop.ozone.client.OzoneClient;
+import org.apache.hadoop.ozone.client.OzoneVolume;
+import org.apache.hadoop.ozone.container.common.impl.ContainerSet;
+import org.apache.hadoop.ozone.container.common.interfaces.DBHandle;
+import 
org.apache.hadoop.ozone.container.common.statemachine.DatanodeConfiguration;
+import org.apache.hadoop.ozone.container.keyvalue.KeyValueContainerData;
+import org.apache.hadoop.ozone.container.keyvalue.helpers.BlockUtils;
+import org.apache.hadoop.ozone.om.OzoneManager;
+import org.apache.hadoop.ozone.om.helpers.BucketLayout;
+import org.apache.hadoop.ozone.om.helpers.OmKeyArgs;
+import org.apache.hadoop.ozone.om.helpers.OmKeyLocationInfo;
+import org.apache.hadoop.ozone.om.helpers.OmKeyLocationInfoGroup;
+import 
org.apache.hadoop.ozone.recon.api.types.StorageCapacityDistributionResponse;
+import org.apache.hadoop.ozone.recon.spi.impl.OzoneManagerServiceProviderImpl;
+import org.apache.ozone.test.GenericTestUtils;
+import org.apache.ratis.util.function.CheckedConsumer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Test class for the Storage Distribution REST endpoint in the
+ * Recon service. This class is responsible for setting up the
+ * testing environment, performing operations on an Ozone cluster,
+ * and validating the response of the storage distribution endpoint.
+ */
+public class TestStorageDistributionEndpoint {
+
+  private static final Logger LOG =
+      LoggerFactory.getLogger(TestStorageDistributionEndpoint.class);
+
+  private static OzoneConfiguration conf;
+  private static MiniOzoneCluster cluster;
+  private static OzoneManager om;
+  private static StorageContainerManager scm;
+  private static OzoneClient client;
+  private static ReconService recon;
+  private FileSystem fs;
+  private static final ObjectMapper MAPPER = new ObjectMapper();
+
+  private static final String STORAGE_DIST_ENDPOINT = 
"/api/v1/storageDistribution";
+
+  static List<Arguments> replicationConfigs() {
+    return Collections.singletonList(
+        Arguments.of(ReplicationConfig.fromTypeAndFactor(RATIS, THREE))
+    );
+  }
+
+  @BeforeAll
+  public static void setup() throws Exception {
+    conf = new OzoneConfiguration();
+    conf.setTimeDuration(OZONE_BLOCK_DELETING_SERVICE_INTERVAL, 100,
+        TimeUnit.MILLISECONDS);
+    conf.setTimeDuration(OZONE_BLOCK_DELETING_SERVICE_TIMEOUT, 100,
+        TimeUnit.MILLISECONDS);
+    conf.setTimeDuration(OZONE_SCM_HEARTBEAT_PROCESS_INTERVAL,
+        100, TimeUnit.MILLISECONDS);
+    conf.setLong(OZONE_SCM_HA_RATIS_SNAPSHOT_GAP, 1L);
+    conf.setTimeDuration(HDDS_HEARTBEAT_INTERVAL, 50,
+        TimeUnit.MILLISECONDS);
+    conf.setTimeDuration(HDDS_CONTAINER_REPORT_INTERVAL, 200,
+        TimeUnit.MILLISECONDS);
+
+    // Enhanced SCM configuration for faster block deletion processing
+    ScmConfig scmConfig = conf.getObject(ScmConfig.class);
+    scmConfig.setBlockDeletionInterval(Duration.ofMillis(100));
+    conf.setFromObject(scmConfig);
+    conf.set(HDDS_SCM_WAIT_TIME_AFTER_SAFE_MODE_EXIT, "0s");
+
+    // Enhanced DataNode configuration to move pending deletion from SCM to DN 
faster
+    DatanodeConfiguration dnConf =
+        conf.getObject(DatanodeConfiguration.class);
+    dnConf.setBlockDeletionInterval(Duration.ofMillis(100));
+    // Increase block delete queue limit to allow more queued commands on DN
+    dnConf.setBlockDeleteQueueLimit(50);
+    // Reduce the interval for delete command worker processing
+    dnConf.setBlockDeleteCommandWorkerInterval(Duration.ofMillis(100));
+    // Increase blocks deleted per interval to speed up deletion
+    dnConf.setBlockDeletionLimit(5000);
+    conf.setFromObject(dnConf);
+    // Increase DN delete threads for faster parallel processing
+    conf.setInt("ozone.datanode.block.delete.threads.max", 10);
+
+    recon = new ReconService(conf);
+    cluster = MiniOzoneCluster.newBuilder(conf)
+        .setNumDatanodes(3)
+        .addService(recon)
+        .build();
+    cluster.waitForClusterToBeReady();
+    om = cluster.getOzoneManager();
+    scm = cluster.getStorageContainerManager();
+    client = cluster.newClient();
+  }
+
+  @ParameterizedTest
+  @MethodSource("replicationConfigs")
+  public void testStorageDistributionEndpoint(ReplicationConfig 
replicationConfig) throws Exception {
+    ObjectStore objectStore = client.getObjectStore();
+    objectStore.createVolume("vol1");
+    BucketArgs bucketArgs = BucketArgs.newBuilder()
+        .setBucketLayout(BucketLayout.FILE_SYSTEM_OPTIMIZED)
+        .setDefaultReplicationConfig(new 
DefaultReplicationConfig(replicationConfig))
+        .build();
+
+    OzoneVolume volume = objectStore.getVolume("vol1");
+    volume.createBucket("bucket1", bucketArgs);
+    OzoneBucket bucket = volume.getBucket("bucket1");
+
+    String rootPath = String.format("%s://%s.%s/", 
OzoneConsts.OZONE_URI_SCHEME, bucket.getName(),
+        bucket.getVolumeName());
+
+    conf.set(CommonConfigurationKeysPublic.FS_DEFAULT_NAME_KEY, rootPath);
+    fs = FileSystem.get(conf);
+
+    Path dir1 = new Path("/dir1");
+    fs.mkdirs(dir1);
+    for (int i = 1; i <= 10; i++) {
+      Path path1 = new Path(dir1, "testKey" + i);
+      try (FSDataOutputStream stream = fs.create(path1)) {
+        stream.write(1);
+      }
+    }
+    Path dir2 = new Path("/dir2");
+    fs.mkdirs(dir2);
+    for (int i = 1; i <= 10; i++) {
+      Path path1 = new Path(dir2, "testKey" + i);
+      try (FSDataOutputStream stream = fs.create(path1)) {
+        stream.write(1);
+      }
+    }
+    waitForKeysCreated(replicationConfig);
+    Thread.sleep(10000);

Review Comment:
   > We can handle this in a follow-up PR for the same feature. No need to 
rerun the tests now and waste resources
   
   Addressing this in a follow-up requires more resources, not less:
   - same resources for PR run or re-run
   - +1 run after PR merge for the follow-up commit
   
   Even most of the first item could have been avoided, since this was noticed 
at around the same time when the PR workflow was approved to run.



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