HDFS-13444. Ozone: Fix checkstyle issues in HDFS-7240. Contributed by Lokesh Jain.

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsConfigKeys.java

@@ -1,6 +1,6 @@
 package org.apache.hadoop.hdds;
 
-public class HddsConfigKeys {
+public final class HddsConfigKeys {
   private HddsConfigKeys() {
   }
 }

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java

@@ -48,7 +48,7 @@ import static org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_ENABLED_DEFAULT;
 /**
  * HDDS specific stateless utility functions.
  */
-public class HddsUtils {
+public final class HddsUtils {
 
 
   private static final Logger LOG = LoggerFactory.getLogger(HddsUtils.class);

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/conf/HddsConfServlet.java

@@ -53,7 +53,8 @@ public class HddsConfServlet extends HttpServlet {
   private static final String COMMAND = "cmd";
   private static final OzoneConfiguration OZONE_CONFIG =
       new OzoneConfiguration();
-  transient Logger LOG = LoggerFactory.getLogger(HddsConfServlet.class);
+  private static final transient Logger LOG =
+      LoggerFactory.getLogger(HddsConfServlet.class);
 
 
   /**
@@ -152,25 +153,25 @@ public class HddsConfServlet extends HttpServlet {
     Configuration config = getOzoneConfig();
 
     switch (cmd) {
-      case "getOzoneTags":
-        out.write(gson.toJson(config.get("ozone.system.tags").split(",")));
-        break;
-      case "getPropertyByTag":
-        String tags = request.getParameter("tags");
-        Map<String, Properties> propMap = new HashMap<>();
-
-        for (String tag : tags.split(",")) {
-          if (config.isPropertyTag(tag)) {
-            Properties properties = config.getAllPropertiesByTag(tag);
-            propMap.put(tag, properties);
-          } else {
-            LOG.debug("Not a valid tag" + tag);
-          }
+    case "getOzoneTags":
+      out.write(gson.toJson(config.get("ozone.system.tags").split(",")));
+      break;
+    case "getPropertyByTag":
+      String tags = request.getParameter("tags");
+      Map<String, Properties> propMap = new HashMap<>();
+
+      for (String tag : tags.split(",")) {
+        if (config.isPropertyTag(tag)) {
+          Properties properties = config.getAllPropertiesByTag(tag);
+          propMap.put(tag, properties);
+        } else {
+          LOG.debug("Not a valid tag" + tag);
         }
-        out.write(gson.toJsonTree(propMap).toString());
-        break;
-      default:
-        throw new IllegalArgumentException(cmd + " is not a valid command.");
+      }
+      out.write(gson.toJsonTree(propMap).toString());
+      break;
+    default:
+      throw new IllegalArgumentException(cmd + " is not a valid command.");
     }
 
   }

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/container/package-info.java

@@ -0,0 +1,18 @@
+/**
+ * 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.hdds.scm.container;

hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/web/utils/package-info.java

@@ -0,0 +1,19 @@
+/**
+ * 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.web.utils;

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/HddsServerUtil.java

@@ -55,7 +55,10 @@ import static org.apache.hadoop.hdds.server.ServerUtils.sanitizeUserArgs;
 /**
  * Hdds stateless helper functions for server side components.
  */
-public class HddsServerUtil {
+public final class HddsServerUtil {
+
+  private HddsServerUtil() {
+  }
 
   private static final Logger LOG = LoggerFactory.getLogger(
       HddsServerUtil.class);

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/hdds/scm/package-info.java

@@ -0,0 +1,19 @@
+/**
+ * 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.hdds.scm;

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/HddsDatanodeService.java

@@ -227,7 +227,7 @@ public class HddsDatanodeService implements ServicePlugin {
     return new HddsDatanodeService(conf);
   }
 
-  public static void main(String args[]) {
+  public static void main(String[] args) {
     try {
       StringUtils.startupShutdownMessage(HddsDatanodeService.class, args, LOG);
       HddsDatanodeService hddsDatanodeService =

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/ChunkManagerImpl.java

@@ -107,6 +107,8 @@ public class ChunkManagerImpl implements ChunkManager {
         containerManager.incrWriteCount(containerName);
         containerManager.incrWriteBytes(containerName, info.getLen());
         break;
+      default:
+        throw new IOException("Can not identify write operation.");
       }
     } catch (ExecutionException | NoSuchAlgorithmException | IOException e) {
       LOG.error("write data failed. error: {}", e);

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/Dispatcher.java

@@ -464,7 +464,7 @@ public class Dispatcher implements ContainerDispatcher {
     byte[] data = null;
     if (msg.getWriteChunk().getStage() == ContainerProtos.Stage.WRITE_DATA
         || msg.getWriteChunk().getStage() == ContainerProtos.Stage.COMBINED) {
-       data = msg.getWriteChunk().getData().toByteArray();
+      data = msg.getWriteChunk().getData().toByteArray();
       metrics.incContainerBytesStats(Type.WriteChunk, data.length);
 
     }

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/protocol/commands/RegisteredCommand.java

@@ -195,13 +195,13 @@ public class RegisteredCommand extends
     /**
      * sets the hostname.
      */
-    public Builder setHostname(String hostname) {
-      this.hostname = hostname;
+    public Builder setHostname(String host) {
+      this.hostname = host;
       return this;
     }
 
-    public Builder setIpAddress(String ipAddress) {
-      this.ipAddress = ipAddress;
+    public Builder setIpAddress(String ipAddr) {
+      this.ipAddress = ipAddr;
       return this;
     }
 

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/protocolPB/package-info.java

@@ -0,0 +1,19 @@
+/**
+ * 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.protocolPB;

hadoop-hdds/container-service/src/test/java/org/apache/hadoop/ozone/container/common/ContainerTestUtils.java

@@ -34,7 +34,7 @@ import java.net.InetSocketAddress;
 /**
  * Helper utility to test containers.
  */
-public class ContainerTestUtils {
+public final class ContainerTestUtils {
 
   private ContainerTestUtils() {
   }

hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/ServerUtils.java

@@ -32,7 +32,7 @@ import java.net.InetSocketAddress;
 /**
  * Generic utilities for all HDDS/Ozone servers.
  */
-public class ServerUtils {
+public final class ServerUtils {
 
   private static final Logger LOG = LoggerFactory.getLogger(
       ServerUtils.class);

hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/TestUtils.java

@@ -27,7 +27,7 @@ import java.util.UUID;
 /**
  * Stateless helper functions to handler scm/datanode connection.
  */
-public class TestUtils {
+public final class TestUtils {
 
   private TestUtils() {
   }

hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/ozone/container/placement/TestContainerPlacement.java

@@ -89,8 +89,8 @@ public class TestContainerPlacement {
           capacityPlacer.chooseDatanodes(nodesRequired, containerSize);
       assertEquals(nodesRequired, nodesCapacity.size());
 
-      List<DatanodeDetails> nodesRandom = randomPlacer.chooseDatanodes(nodesRequired,
-          containerSize);
+      List<DatanodeDetails> nodesRandom =
+          randomPlacer.chooseDatanodes(nodesRequired, containerSize);
 
       // One fifth of all calls are delete
       if (x % 5 == 0) {

hadoop-hdds/tools/src/main/java/org/apache/hadoop/hdds/scm/cli/OzoneCommandHandler.java

@@ -59,7 +59,7 @@ public abstract class OzoneCommandHandler {
     this.err = err;
   }
 
-  public void logOut(String msg, String ... variable) {
+  public void logOut(String msg, String... variable) {
     this.out.println(String.format(msg, variable));
   }
 

hadoop-hdds/tools/src/main/java/org/apache/hadoop/hdds/scm/cli/SCMCLI.java

@@ -148,8 +148,9 @@ public class SCMCLI extends OzoneBaseCLI {
   }
 
   private static void addTopLevelOptions(Options options) {
-    Option containerOps = new Option(
-        ContainerCommandHandler.CONTAINER_CMD, false, "Container related options");
+    Option containerOps =
+        new Option(ContainerCommandHandler.CONTAINER_CMD, false,
+            "Container related options");
     options.addOption(containerOps);
     // TODO : add pool, node and pipeline commands.
   }

hadoop-hdds/tools/src/main/java/org/apache/hadoop/hdds/scm/cli/container/CloseContainerHandler.java

@@ -66,8 +66,9 @@ public class CloseContainerHandler extends OzoneCommandHandler {
     Options options = new Options();
     addOptions(options);
     HelpFormatter helpFormatter = new HelpFormatter();
-    helpFormatter.printHelp(SCMCLI.CMD_WIDTH, "hdfs scm -container -close <option>",
-        "where <option> is", options, "");
+    helpFormatter
+        .printHelp(SCMCLI.CMD_WIDTH, "hdfs scm -container -close <option>",
+            "where <option> is", options, "");
   }
 
   public static void addOptions(Options options) {

hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestHddsClientUtils.java

@@ -35,8 +35,8 @@ import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertThat;
 
 /**
- * This test class verifies the parsing of SCM endpoint config settings.
- * The parsing logic is in {@link org.apache.hadoop.hdds.scm.client.HddsClientUtils}.
+ * This test class verifies the parsing of SCM endpoint config settings. The
+ * parsing logic is in {@link org.apache.hadoop.hdds.scm.client.HddsClientUtils}.
  */
 public class TestHddsClientUtils {
   @Rule

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/KsmUtils.java

@@ -34,7 +34,7 @@ import static org.apache.hadoop.ozone.ksm.KSMConfigKeys.OZONE_KSM_PORT_DEFAULT;
  * Stateless helper functions for the server and client side of KSM
  * communication.
  */
-public class KsmUtils {
+public final class KsmUtils {
 
   private KsmUtils() {
   }

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/freon/OzoneGetConf.java

@@ -115,7 +115,7 @@ public class OzoneGetConf extends Configured implements Tool {
    * {@link OzoneGetConf.Command}.
    */
   static class CommandHandler {
-    String key; // Configuration key to lookup
+    protected String key; // Configuration key to lookup
 
     CommandHandler() {
       this(null);
@@ -136,7 +136,7 @@ public class OzoneGetConf extends Configured implements Tool {
       return -1;
     }
 
-    protected void checkArgs(String args[]) {
+    protected void checkArgs(String[] args) {
       if (args.length > 0) {
         throw new HadoopIllegalArgumentException(
             "Did not expect argument: " + args[0]);
@@ -144,7 +144,7 @@ public class OzoneGetConf extends Configured implements Tool {
     }
 
 
-    /** Method to be overridden by sub classes for specific behavior */
+    /** Method to be overridden by sub classes for specific behavior. */
     int doWorkInternal(OzoneGetConf tool, String[] args) throws Exception {
 
       String value = tool.getConf().getTrimmed(key);
@@ -205,10 +205,10 @@ public class OzoneGetConf extends Configured implements Tool {
    */
   private int doWork(String[] args) {
     if (args.length >= 1) {
-      OzoneGetConf.CommandHandler handler = OzoneGetConf.Command.getHandler(args[0]);
+      OzoneGetConf.CommandHandler handler =
+          OzoneGetConf.Command.getHandler(args[0]);
       if (handler != null) {
-        return handler.doWork(this,
-            Arrays.copyOfRange(args, 1, args.length));
+        return handler.doWork(this, Arrays.copyOfRange(args, 1, args.length));
       }
     }
     printUsage();
@@ -249,9 +249,9 @@ public class OzoneGetConf extends Configured implements Tool {
    */
   static class KeySpaceManagersCommandHandler extends CommandHandler {
     @Override
-    public int doWorkInternal(OzoneGetConf tool, String[] args) throws IOException {
-      tool.printOut(KsmUtils.getKsmAddress(tool.getConf())
-          .getHostName());
+    public int doWorkInternal(OzoneGetConf tool, String[] args)
+        throws IOException {
+      tool.printOut(KsmUtils.getKsmAddress(tool.getConf()).getHostName());
       return 0;
     }
   }

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/hdds/scm/container/TestContainerStateManager.java

@@ -44,7 +44,7 @@ public class TestContainerStateManager {
   private XceiverClientManager xceiverClientManager;
   private StorageContainerManager scm;
   private Mapping scmContainerMapping;
-  private ContainerStateManager stateManager;
+  private ContainerStateManager containerStateManager;
   private String containerOwner = "OZONE";
 
 
@@ -56,7 +56,7 @@ public class TestContainerStateManager {
     xceiverClientManager = new XceiverClientManager(conf);
     scm = cluster.getStorageContainerManager();
     scmContainerMapping = scm.getScmContainerManager();
-    stateManager = scmContainerMapping.getStateManager();
+    containerStateManager = scmContainerMapping.getStateManager();
   }
 
   @After
@@ -72,7 +72,7 @@ public class TestContainerStateManager {
     String container1 = "container" + RandomStringUtils.randomNumeric(5);
     scm.allocateContainer(xceiverClientManager.getType(),
         xceiverClientManager.getFactor(), container1, containerOwner);
-    ContainerInfo info = stateManager
+    ContainerInfo info = containerStateManager
         .getMatchingContainer(OzoneConsts.GB * 3, containerOwner,
             xceiverClientManager.getType(), xceiverClientManager.getFactor(),
             HddsProtos.LifeCycleState.ALLOCATED);
@@ -89,7 +89,7 @@ public class TestContainerStateManager {
     String container2 = "container" + RandomStringUtils.randomNumeric(5);
     scm.allocateContainer(xceiverClientManager.getType(),
         xceiverClientManager.getFactor(), container2, containerOwner);
-    int numContainers = stateManager
+    int numContainers = containerStateManager
         .getMatchingContainerIDs(containerOwner,
             xceiverClientManager.getType(), xceiverClientManager.getFactor(),
             HddsProtos.LifeCycleState.ALLOCATED).size();
@@ -139,13 +139,13 @@ public class TestContainerStateManager {
     scm.allocateContainer(xceiverClientManager.getType(),
         xceiverClientManager.getFactor(), container2, containerOwner);
 
-    ContainerInfo info = stateManager
+    ContainerInfo info = containerStateManager
         .getMatchingContainer(OzoneConsts.GB * 3, containerOwner,
             xceiverClientManager.getType(), xceiverClientManager.getFactor(),
             HddsProtos.LifeCycleState.OPEN);
     Assert.assertEquals(container1, info.getContainerName());
 
-    info = stateManager
+    info = containerStateManager
         .getMatchingContainer(OzoneConsts.GB * 3, containerOwner,
             xceiverClientManager.getType(), xceiverClientManager.getFactor(),
             HddsProtos.LifeCycleState.ALLOCATED);
@@ -158,7 +158,7 @@ public class TestContainerStateManager {
 
     // space has already been allocated in container1, now container 2 should
     // be chosen.
-    info = stateManager
+    info = containerStateManager
         .getMatchingContainer(OzoneConsts.GB * 3, containerOwner,
             xceiverClientManager.getType(), xceiverClientManager.getFactor(),
             HddsProtos.LifeCycleState.OPEN);
@@ -167,7 +167,7 @@ public class TestContainerStateManager {
 
   @Test
   public void testUpdateContainerState() throws IOException {
-    NavigableSet<ContainerID> containerList = stateManager
+    NavigableSet<ContainerID> containerList = containerStateManager
         .getMatchingContainerIDs(containerOwner,
             xceiverClientManager.getType(), xceiverClientManager.getFactor(),
             HddsProtos.LifeCycleState.ALLOCATED);
@@ -179,49 +179,49 @@ public class TestContainerStateManager {
     String container1 = "container" + RandomStringUtils.randomNumeric(5);
     scm.allocateContainer(xceiverClientManager.getType(),
         xceiverClientManager.getFactor(), container1, containerOwner);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.ALLOCATED).size();
     Assert.assertEquals(1, containers);
 
     scmContainerMapping.updateContainerState(container1,
         HddsProtos.LifeCycleEvent.CREATE);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.CREATING).size();
     Assert.assertEquals(1, containers);
 
     scmContainerMapping.updateContainerState(container1,
         HddsProtos.LifeCycleEvent.CREATED);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.OPEN).size();
     Assert.assertEquals(1, containers);
 
     scmContainerMapping
         .updateContainerState(container1, HddsProtos.LifeCycleEvent.FINALIZE);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.CLOSING).size();
     Assert.assertEquals(1, containers);
 
     scmContainerMapping
         .updateContainerState(container1, HddsProtos.LifeCycleEvent.CLOSE);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.CLOSED).size();
     Assert.assertEquals(1, containers);
 
     scmContainerMapping
         .updateContainerState(container1, HddsProtos.LifeCycleEvent.DELETE);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.DELETING).size();
     Assert.assertEquals(1, containers);
 
     scmContainerMapping
         .updateContainerState(container1, HddsProtos.LifeCycleEvent.CLEANUP);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.DELETED).size();
     Assert.assertEquals(1, containers);
@@ -235,7 +235,7 @@ public class TestContainerStateManager {
         HddsProtos.LifeCycleEvent.CREATE);
     scmContainerMapping
         .updateContainerState(container2, HddsProtos.LifeCycleEvent.TIMEOUT);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.DELETING).size();
     Assert.assertEquals(1, containers);
@@ -253,7 +253,7 @@ public class TestContainerStateManager {
         HddsProtos.LifeCycleEvent.FINALIZE);
     scmContainerMapping
         .updateContainerState(container3, HddsProtos.LifeCycleEvent.CLOSE);
-    containers = stateManager.getMatchingContainerIDs(containerOwner,
+    containers = containerStateManager.getMatchingContainerIDs(containerOwner,
         xceiverClientManager.getType(), xceiverClientManager.getFactor(),
         HddsProtos.LifeCycleState.CLOSED).size();
     Assert.assertEquals(1, containers);
@@ -275,7 +275,7 @@ public class TestContainerStateManager {
       long size = Math.abs(ran.nextLong() % OzoneConsts.GB);
       allocatedSize += size;
       // trigger allocating bytes by calling getMatchingContainer
-      ContainerInfo info = stateManager
+      ContainerInfo info = containerStateManager
           .getMatchingContainer(size, containerOwner,
               xceiverClientManager.getType(), xceiverClientManager.getFactor(),
               HddsProtos.LifeCycleState.OPEN);

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/MiniOzoneCluster.java

@@ -119,8 +119,8 @@ public interface MiniOzoneCluster {
    * @return StorageContainerLocation Client
    * @throws IOException
    */
-  StorageContainerLocationProtocolClientSideTranslatorPB
-  getStorageContainerLocationClient()  throws IOException;
+  StorageContainerLocationProtocolClientSideTranslatorPB getStorageContainerLocationClient()
+      throws IOException;
 
   /**
    * Restarts StorageContainerManager instance.
@@ -166,6 +166,9 @@ public interface MiniOzoneCluster {
     return new MiniOzoneClusterImpl.Builder(conf);
   }
 
+  /**
+   * Builder class for MiniOzoneCluster.
+   */
   abstract class Builder {
 
     protected static final int DEFAULT_HB_INTERVAL_MS = 1000;
@@ -280,7 +283,7 @@ public interface MiniOzoneCluster {
      *
      * @return MiniOzoneCluster.Builder
      */
-    public Builder setHbProcessorInterval (int val) {
+    public Builder setHbProcessorInterval(int val) {
       hbProcessorInterval = Optional.of(val);
       return this;
     }

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/MiniOzoneClusterImpl.java

@@ -179,8 +179,8 @@ public final class MiniOzoneClusterImpl implements MiniOzoneCluster {
    * @throws IOException if there is an I/O error
    */
   @Override
-  public StorageContainerLocationProtocolClientSideTranslatorPB
-  getStorageContainerLocationClient() throws IOException {
+  public StorageContainerLocationProtocolClientSideTranslatorPB getStorageContainerLocationClient()
+      throws IOException {
     long version = RPC.getProtocolVersion(
         StorageContainerLocationProtocolPB.class);
     InetSocketAddress address = scm.getClientRpcAddress();

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/ksm/TestContainerReportWithKeys.java

@@ -96,9 +96,10 @@ public class TestContainerReportWithKeys {
     ObjectStore objectStore = client.getObjectStore();
     objectStore.createVolume(volumeName);
     objectStore.getVolume(volumeName).createBucket(bucketName);
-    OzoneOutputStream key = objectStore.getVolume(volumeName).getBucket(bucketName)
-        .createKey(keyName, keySize, ReplicationType.STAND_ALONE,
-            ReplicationFactor.ONE);
+    OzoneOutputStream key =
+        objectStore.getVolume(volumeName).getBucket(bucketName)
+            .createKey(keyName, keySize, ReplicationType.STAND_ALONE,
+                ReplicationFactor.ONE);
     String dataString = RandomStringUtils.randomAlphabetic(keySize);
     key.write(dataString.getBytes());
     key.close();

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/scm/TestContainerSQLCli.java

@@ -96,7 +96,7 @@ public class TestContainerSQLCli {
   private final static long DEFAULT_BLOCK_SIZE = 4 * KB;
   private static HddsProtos.ReplicationFactor factor;
   private static HddsProtos.ReplicationType type;
-  private static final String containerOwner = "OZONE";
+  private static final String CONTAINER_OWNER = "OZONE";
 
 
   @Before
@@ -141,7 +141,7 @@ public class TestContainerSQLCli {
     }
     assertEquals(2, nodeManager.getAllNodes().size());
     AllocatedBlock ab1 = blockManager.allocateBlock(DEFAULT_BLOCK_SIZE, type,
-        factor, containerOwner);
+        factor, CONTAINER_OWNER);
     pipeline1 = ab1.getPipeline();
     blockContainerMap.put(ab1.getKey(), pipeline1.getContainerName());
 
@@ -154,7 +154,7 @@ public class TestContainerSQLCli {
     // the size of blockContainerMap will vary each time the test is run.
     while (true) {
       ab2 = blockManager
-          .allocateBlock(DEFAULT_BLOCK_SIZE, type, factor, containerOwner);
+          .allocateBlock(DEFAULT_BLOCK_SIZE, type, factor, CONTAINER_OWNER);
       pipeline2 = ab2.getPipeline();
       blockContainerMap.put(ab2.getKey(), pipeline2.getContainerName());
       if (!pipeline1.getContainerName().equals(pipeline2.getContainerName())) {

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/scm/node/TestQueryNode.java

@@ -14,7 +14,7 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-package org.apache.hadoop.hdds.scm.node;
+package org.apache.hadoop.ozone.scm.node;
 
 import org.apache.hadoop.ozone.MiniOzoneCluster;
 import org.apache.hadoop.hdds.conf.OzoneConfiguration;

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/BenchMarkContainerStateMap.java

@@ -42,89 +42,73 @@ import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
+
 import static org.apache.hadoop.hdds.protocol.proto.HddsProtos.LifeCycleState.OPEN;
 import static org.apache.hadoop.hdds.protocol.proto.HddsProtos.LifeCycleState.CLOSED;
-import static org.apache.hadoop.hdds.protocol.proto.HddsProtos.ReplicationType;
-import static org.apache.hadoop.hdds.protocol.proto.HddsProtos.ReplicationFactor;
 
 @State(Scope.Thread)
 public class BenchMarkContainerStateMap {
-    public ContainerStateMap stateMap;
-    public AtomicInteger containerID;
+  private ContainerStateMap stateMap;
+  private AtomicInteger containerID;
 
-    @Setup(Level.Trial)
-    public void initialize() throws IOException {
-      stateMap = new ContainerStateMap();
-      Pipeline pipeline = createSingleNodePipeline(UUID.randomUUID().toString());
-      Preconditions.checkNotNull(pipeline, "Pipeline cannot be null.");
-      int currentCount = 1;
-      for (int x = 1; x < 1000; x++) {
-        try {
-          ContainerInfo containerInfo = new ContainerInfo.Builder()
-              .setContainerName(pipeline.getContainerName())
-              .setState(CLOSED)
-              .setPipeline(pipeline)
-              // This is bytes allocated for blocks inside container, not the
-              // container size
-              .setAllocatedBytes(0)
-              .setUsedBytes(0)
-              .setNumberOfKeys(0)
-              .setStateEnterTime(Time.monotonicNow())
-              .setOwner("OZONE")
-              .setContainerID(x)
-              .build();
-          stateMap.addContainer(containerInfo);
-          currentCount++;
-        } catch (SCMException e) {
-          e.printStackTrace();
-        }
-      }
-      for (int y = currentCount; y < 2000; y++) {
-        try {
-          ContainerInfo containerInfo = new ContainerInfo.Builder()
-              .setContainerName(pipeline.getContainerName())
-              .setState(OPEN)
-              .setPipeline(pipeline)
-              // This is bytes allocated for blocks inside container, not the
-              // container size
-              .setAllocatedBytes(0)
-              .setUsedBytes(0)
-              .setNumberOfKeys(0)
-              .setStateEnterTime(Time.monotonicNow())
-              .setOwner("OZONE")
-              .setContainerID(y)
-              .build();
-          stateMap.addContainer(containerInfo);
-          currentCount++;
-        } catch (SCMException e) {
-          e.printStackTrace();
-        }
+  @Setup(Level.Trial)
+  public void initialize() throws IOException {
+    stateMap = new ContainerStateMap();
+    Pipeline pipeline = createSingleNodePipeline(UUID.randomUUID().toString());
+    Preconditions.checkNotNull(pipeline, "Pipeline cannot be null.");
+    int currentCount = 1;
+    for (int x = 1; x < 1000; x++) {
+      try {
+        ContainerInfo containerInfo = new ContainerInfo.Builder()
+            .setContainerName(pipeline.getContainerName()).setState(CLOSED)
+            .setPipeline(pipeline)
+            // This is bytes allocated for blocks inside container, not the
+            // container size
+            .setAllocatedBytes(0).setUsedBytes(0).setNumberOfKeys(0)
+            .setStateEnterTime(Time.monotonicNow()).setOwner("OZONE")
+            .setContainerID(x).build();
+        stateMap.addContainer(containerInfo);
+        currentCount++;
+      } catch (SCMException e) {
+        e.printStackTrace();
       }
+    }
+    for (int y = currentCount; y < 2000; y++) {
       try {
         ContainerInfo containerInfo = new ContainerInfo.Builder()
-            .setContainerName(pipeline.getContainerName())
-            .setState(OPEN)
+            .setContainerName(pipeline.getContainerName()).setState(OPEN)
             .setPipeline(pipeline)
             // This is bytes allocated for blocks inside container, not the
             // container size
-            .setAllocatedBytes(0)
-            .setUsedBytes(0)
-            .setNumberOfKeys(0)
-            .setStateEnterTime(Time.monotonicNow())
-            .setOwner("OZONE")
-            .setContainerID(currentCount++)
-            .build();
+            .setAllocatedBytes(0).setUsedBytes(0).setNumberOfKeys(0)
+            .setStateEnterTime(Time.monotonicNow()).setOwner("OZONE")
+            .setContainerID(y).build();
         stateMap.addContainer(containerInfo);
+        currentCount++;
       } catch (SCMException e) {
         e.printStackTrace();
       }
+    }
+    try {
+      ContainerInfo containerInfo = new ContainerInfo.Builder()
+          .setContainerName(pipeline.getContainerName()).setState(OPEN)
+          .setPipeline(pipeline)
+          // This is bytes allocated for blocks inside container, not the
+          // container size
+          .setAllocatedBytes(0).setUsedBytes(0).setNumberOfKeys(0)
+          .setStateEnterTime(Time.monotonicNow()).setOwner("OZONE")
+          .setContainerID(currentCount++).build();
+      stateMap.addContainer(containerInfo);
+    } catch (SCMException e) {
+      e.printStackTrace();
+    }
 
-      containerID = new AtomicInteger(currentCount++);
+    containerID = new AtomicInteger(currentCount++);
 
-    }
+  }
 
-  public static Pipeline createSingleNodePipeline(String containerName) throws
-      IOException {
+  public static Pipeline createSingleNodePipeline(String containerName)
+      throws IOException {
     return createPipeline(containerName, 1);
   }
 
@@ -144,9 +128,8 @@ public class BenchMarkContainerStateMap {
     return createPipeline(containerName, ids);
   }
 
-  public static Pipeline createPipeline(
-      String containerName, Iterable<DatanodeDetails> ids)
-      throws IOException {
+  public static Pipeline createPipeline(String containerName,
+      Iterable<DatanodeDetails> ids) throws IOException {
     Objects.requireNonNull(ids, "ids == null");
     final Iterator<DatanodeDetails> i = ids.iterator();
     Preconditions.checkArgument(i.hasNext());
@@ -156,37 +139,33 @@ public class BenchMarkContainerStateMap {
         new PipelineChannel(leader.getUuidString(), OPEN,
             ReplicationType.STAND_ALONE, ReplicationFactor.ONE, pipelineName);
     pipelineChannel.addMember(leader);
-    for (; i.hasNext(); ) {
+    for (; i.hasNext();) {
       pipelineChannel.addMember(i.next());
     }
     return new Pipeline(containerName, pipelineChannel);
   }
 
   @Benchmark
-  public void createContainerBenchMark(BenchMarkContainerStateMap state, Blackhole bh)
-      throws IOException {
+  public void createContainerBenchMark(BenchMarkContainerStateMap state,
+      Blackhole bh) throws IOException {
     Pipeline pipeline = createSingleNodePipeline(UUID.randomUUID().toString());
     int cid = state.containerID.incrementAndGet();
     ContainerInfo containerInfo = new ContainerInfo.Builder()
-        .setContainerName(pipeline.getContainerName())
-        .setState(CLOSED)
+        .setContainerName(pipeline.getContainerName()).setState(CLOSED)
         .setPipeline(pipeline)
         // This is bytes allocated for blocks inside container, not the
         // container size
-        .setAllocatedBytes(0)
-        .setUsedBytes(0)
-        .setNumberOfKeys(0)
-        .setStateEnterTime(Time.monotonicNow())
-        .setOwner("OZONE")
-        .setContainerID(cid)
-        .build();
+        .setAllocatedBytes(0).setUsedBytes(0).setNumberOfKeys(0)
+        .setStateEnterTime(Time.monotonicNow()).setOwner("OZONE")
+        .setContainerID(cid).build();
     state.stateMap.addContainer(containerInfo);
   }
 
   @Benchmark
   public void getMatchingContainerBenchMark(BenchMarkContainerStateMap state,
       Blackhole bh) {
-    bh.consume(state.stateMap.getMatchingContainerIDs(OPEN, "BILBO",
-        ReplicationFactor.ONE, ReplicationType.STAND_ALONE));
+    bh.consume(state.stateMap
+        .getMatchingContainerIDs(OPEN, "BILBO", ReplicationFactor.ONE,
+            ReplicationType.STAND_ALONE));
   }
 }

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/BenchMarkDatanodeDispatcher.java

@@ -7,7 +7,6 @@ import org.apache.commons.lang.RandomStringUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
 import org.apache.hadoop.hdds.conf.OzoneConfiguration;
-import org.apache.hadoop.hdds.protocol.DatanodeDetails;
 import org.apache.hadoop.ozone.container.common.impl.ChunkManagerImpl;
 import org.apache.hadoop.ozone.container.common.impl.ContainerManagerImpl;
 import org.apache.hadoop.ozone.container.common.impl.Dispatcher;
@@ -106,7 +105,8 @@ public class BenchMarkDatanodeDispatcher {
       for (int y = 0; y < 100; y++) {
         String containerName = "container-" + y;
         dispatcher.dispatch(getWriteChunkCommand(containerName, chunkName));
-        dispatcher.dispatch(getPutKeyCommand(containerName, chunkName, keyName));
+        dispatcher
+            .dispatch(getPutKeyCommand(containerName, chunkName, keyName));
       }
     }
   }
@@ -119,8 +119,8 @@ public class BenchMarkDatanodeDispatcher {
 
   private ContainerCommandRequestProto getCreateContainerCommand(
       String containerName) {
-    CreateContainerRequestProto.Builder createRequest = CreateContainerRequestProto
-            .newBuilder();
+    CreateContainerRequestProto.Builder createRequest =
+        CreateContainerRequestProto.newBuilder();
     createRequest.setPipeline(
         new Pipeline(containerName, pipelineChannel).getProtobufMessage());
     createRequest.setContainerData(
@@ -174,12 +174,12 @@ public class BenchMarkDatanodeDispatcher {
 
   private ContainerProtos.ChunkInfo getChunkInfo(
       String containerName, String key) {
-    ContainerProtos.ChunkInfo.Builder builder = ContainerProtos.ChunkInfo
-        .newBuilder()
-        .setChunkName(
-            DigestUtils.md5Hex(key) + "_stream_" + containerName + "_chunk_" + key)
-        .setOffset(0)
-        .setLen(data.size());
+    ContainerProtos.ChunkInfo.Builder builder =
+        ContainerProtos.ChunkInfo.newBuilder()
+            .setChunkName(
+                DigestUtils.md5Hex(key) + "_stream_" + containerName + "_chunk_"
+                    + key)
+            .setOffset(0).setLen(data.size());
     return builder.build();
   }
 
@@ -250,7 +250,7 @@ public class BenchMarkDatanodeDispatcher {
     String containerName = "container-" + random.nextInt(containerCount.get());
     String chunkKey = "chunk-" + random.nextInt(chunkCount.get());
     bmdd.dispatcher.dispatch(getPutKeyCommand(
-        containerName, chunkKey,"key-" + keyCount.getAndIncrement()));
+        containerName, chunkKey, "key-" + keyCount.getAndIncrement()));
   }
 
   @Benchmark

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/BenchMarkMetadataStoreReads.java

@@ -21,7 +21,7 @@ import static org.apache.hadoop.ozone.genesis.GenesisUtil.DEFAULT_TYPE;
 public class BenchMarkMetadataStoreReads {
 
   private static final int DATA_LEN = 1024;
-  private static final long maxKeys = 1024 * 10;
+  private static final long MAX_KEYS = 1024 * 10;
 
   private MetadataStore store;
 
@@ -33,7 +33,7 @@ public class BenchMarkMetadataStoreReads {
     store = GenesisUtil.getMetadataStore(this.type);
     byte[] data = RandomStringUtils.randomAlphanumeric(DATA_LEN)
         .getBytes(Charset.forName("UTF-8"));
-    for (int x = 0; x < maxKeys; x++) {
+    for (int x = 0; x < MAX_KEYS; x++) {
       store.put(Long.toHexString(x).getBytes(Charset.forName("UTF-8")), data);
     }
     if (type.compareTo(CLOSED_TYPE) == 0) {
@@ -43,7 +43,7 @@ public class BenchMarkMetadataStoreReads {
 
   @Benchmark
   public void test(Blackhole bh) throws IOException {
-    long x = org.apache.commons.lang3.RandomUtils.nextLong(0L, maxKeys);
+    long x = org.apache.commons.lang3.RandomUtils.nextLong(0L, MAX_KEYS);
     bh.consume(
         store.get(Long.toHexString(x).getBytes(Charset.forName("UTF-8"))));
   }

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/BenchMarkMetadataStoreWrites.java

@@ -20,7 +20,7 @@ public class BenchMarkMetadataStoreWrites {
 
 
   private static final int DATA_LEN = 1024;
-  private static final long maxKeys = 1024 * 10;
+  private static final long MAX_KEYS = 1024 * 10;
 
   private MetadataStore store;
   private byte[] data;
@@ -37,7 +37,7 @@ public class BenchMarkMetadataStoreWrites {
 
   @Benchmark
   public void test() throws IOException {
-    long x = org.apache.commons.lang3.RandomUtils.nextLong(0L, maxKeys);
+    long x = org.apache.commons.lang3.RandomUtils.nextLong(0L, MAX_KEYS);
     store.put(Long.toHexString(x).getBytes(Charset.forName("UTF-8")), data);
   }
 }

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/BenchMarkRocksDbStore.java

@@ -42,13 +42,13 @@ public class BenchMarkRocksDbStore {
   private byte[] data;
 
   @Param(value = {"8"})
-  private String blockSize;// 4KB default
+  private String blockSize; // 4KB default
 
   @Param(value = {"64"})
   private String writeBufferSize; //64 MB default
 
   @Param(value = {"16"})
-  private String maxWriteBufferNumber;// 2 default
+  private String maxWriteBufferNumber; // 2 default
 
   @Param(value = {"4"})
   private String maxBackgroundFlushes; // 1 default

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/Genesis.java

@@ -31,7 +31,11 @@ import org.openjdk.jmh.runner.options.OptionsBuilder;
  * Hence, these classes do not use the Tool/Runner pattern of standard Hadoop
  * CLI.
  */
-public class Genesis {
+public final class Genesis {
+
+  private Genesis() {
+  }
+
   public static void main(String[] args) throws RunnerException {
     Options opt = new OptionsBuilder()
         .include(BenchMarkContainerStateMap.class.getSimpleName())

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/genesis/GenesisUtil.java

@@ -14,7 +14,7 @@ import java.util.Random;
 /**
  * Utility class for benchmark test cases.
  */
-public class GenesisUtil {
+public final class GenesisUtil {
 
   private GenesisUtil() {
     // private constructor.
@@ -28,8 +28,8 @@ public class GenesisUtil {
   private static final int DB_FILE_LEN = 7;
   private static final String TMP_DIR = "java.io.tmpdir";
 
-
-  public static MetadataStore getMetadataStore(String dbType) throws IOException {
+  public static MetadataStore getMetadataStore(String dbType)
+      throws IOException {
     Configuration conf = new Configuration();
     MetadataStoreBuilder builder = MetadataStoreBuilder.newBuilder();
     builder.setConf(conf);