HDDS-1935. Improve the visibility with Ozone Insight tool (#1255)

hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/protocolPB/ProtocolMessageMetrics.java

@@ -0,0 +1,105 @@
+/*
+ * 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;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicLong;
+
+import org.apache.hadoop.metrics2.MetricsCollector;
+import org.apache.hadoop.metrics2.MetricsInfo;
+import org.apache.hadoop.metrics2.MetricsRecordBuilder;
+import org.apache.hadoop.metrics2.MetricsSource;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
+
+import com.google.protobuf.ProtocolMessageEnum;
+
+/**
+ * Metrics to count all the subtypes of a specific message.
+ */
+public class ProtocolMessageMetrics implements MetricsSource {
+
+  private String name;
+
+  private String description;
+
+  private Map<ProtocolMessageEnum, AtomicLong> counters =
+      new ConcurrentHashMap<>();
+
+  public static ProtocolMessageMetrics create(String name,
+      String description, ProtocolMessageEnum[] types) {
+    ProtocolMessageMetrics protocolMessageMetrics =
+        new ProtocolMessageMetrics(name, description,
+            types);
+    return protocolMessageMetrics;
+  }
+
+  public ProtocolMessageMetrics(String name, String description,
+      ProtocolMessageEnum[] values) {
+    this.name = name;
+    this.description = description;
+    for (ProtocolMessageEnum value : values) {
+      counters.put(value, new AtomicLong(0));
+    }
+  }
+
+  public void increment(ProtocolMessageEnum key) {
+    counters.get(key).incrementAndGet();
+  }
+
+  public void register() {
+    DefaultMetricsSystem.instance()
+        .register(name, description, this);
+  }
+
+  public void unregister() {
+    DefaultMetricsSystem.instance().unregisterSource(name);
+  }
+
+  @Override
+  public void getMetrics(MetricsCollector collector, boolean all) {
+    MetricsRecordBuilder builder = collector.addRecord(name);
+    counters.forEach((key, value) -> {
+      builder.addCounter(new MetricName(key.toString(), ""), value.longValue());
+    });
+    builder.endRecord();
+  }
+
+  /**
+   * Simple metrics info implementation.
+   */
+  public static class MetricName implements MetricsInfo {
+    private String name;
+    private String description;
+
+    public MetricName(String name, String description) {
+      this.name = name;
+      this.description = description;
+    }
+
+    @Override
+    public String name() {
+      return name;
+    }
+
+    @Override
+    public String description() {
+      return description;
+    }
+  }
+}

hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/protocolPB/ScmBlockLocationProtocolServerSideTranslatorPB.java

@@ -17,15 +17,25 @@
  */
 package org.apache.hadoop.ozone.protocolPB;
 
-import com.google.protobuf.RpcController;
+import java.io.IOException;
-import com.google.protobuf.ServiceException;
+import java.util.List;
-import io.opentracing.Scope;
+import java.util.stream.Collectors;
 
 import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos;
 import org.apache.hadoop.hdds.protocol.DatanodeDetails;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
-    .AllocateBlockResponse;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.AllocateBlockResponse;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.AllocateScmBlockRequestProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.AllocateScmBlockResponseProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.DeleteKeyBlocksResultProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.DeleteScmKeyBlocksRequestProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.DeleteScmKeyBlocksResponseProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.SCMBlockLocationRequest;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.SCMBlockLocationResponse;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.SortDatanodesRequestProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.SortDatanodesResponseProto;
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos.Status;
 import org.apache.hadoop.hdds.scm.ScmInfo;
 import org.apache.hadoop.hdds.scm.container.common.helpers.AllocatedBlock;
 import org.apache.hadoop.hdds.scm.container.common.helpers.ExcludeList;
@@ -34,34 +44,15 @@
 import org.apache.hadoop.hdds.scm.protocol.StorageContainerLocationProtocol;
 import org.apache.hadoop.hdds.scm.protocolPB.ScmBlockLocationProtocolPB;
 import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolPB;
-import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .AllocateScmBlockRequestProto;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .AllocateScmBlockResponseProto;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .DeleteKeyBlocksResultProto;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .DeleteScmKeyBlocksRequestProto;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .DeleteScmKeyBlocksResponseProto;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .SCMBlockLocationResponse;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .SCMBlockLocationRequest;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .Status;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .SortDatanodesRequestProto;
-import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos
-    .SortDatanodesResponseProto;
 import org.apache.hadoop.hdds.tracing.TracingUtil;
 import org.apache.hadoop.ozone.common.BlockGroup;
 import org.apache.hadoop.ozone.common.DeleteBlockGroupResult;
 
-import java.io.IOException;
+import com.google.protobuf.RpcController;
-import java.util.List;
+import com.google.protobuf.ServiceException;
-import java.util.stream.Collectors;
+import io.opentracing.Scope;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * This class is the server-side translator that forwards requests received on
@@ -74,14 +65,22 @@ public final class ScmBlockLocationProtocolServerSideTranslatorPB
 
   private final ScmBlockLocationProtocol impl;
 
+  private static final Logger LOG = LoggerFactory
+      .getLogger(ScmBlockLocationProtocolServerSideTranslatorPB.class);
+
+  private final ProtocolMessageMetrics
+      protocolMessageMetrics;
+
   /**
    * Creates a new ScmBlockLocationProtocolServerSideTranslatorPB.
    *
    * @param impl {@link ScmBlockLocationProtocol} server implementation
    */
   public ScmBlockLocationProtocolServerSideTranslatorPB(
-      ScmBlockLocationProtocol impl) throws IOException {
+      ScmBlockLocationProtocol impl,
+      ProtocolMessageMetrics metrics) throws IOException {
     this.impl = impl;
+    this.protocolMessageMetrics = metrics;
   }
 
   private SCMBlockLocationResponse.Builder createSCMBlockResponse(
@@ -97,15 +96,45 @@ public SCMBlockLocationResponse send(RpcController controller,
       SCMBlockLocationRequest request) throws ServiceException {
     String traceId = request.getTraceID();
 
+    if (LOG.isTraceEnabled()) {
+      LOG.trace("BlockLocationProtocol {} request is received: <json>{}</json>",
+          request.getCmdType().toString(),
+          request.toString().replaceAll("\n", "\\\\n"));
+
+    } else if (LOG.isDebugEnabled()) {
+      LOG.debug("BlockLocationProtocol {} request is received",
+          request.getCmdType().toString());
+    }
+
+    protocolMessageMetrics.increment(request.getCmdType());
+
+    try (Scope scope = TracingUtil
+        .importAndCreateScope(
+            "ScmBlockLocationProtocol." + request.getCmdType(),
+            request.getTraceID())) {
+      SCMBlockLocationResponse response =
+          processMessage(request, traceId);
+
+      if (LOG.isTraceEnabled()) {
+        LOG.trace(
+            "BlockLocationProtocol {} request is processed. Response: "
+                + "<json>{}</json>",
+            request.getCmdType().toString(),
+            response.toString().replaceAll("\n", "\\\\n"));
+      }
+      return response;
+    }
+  }
+
+  private SCMBlockLocationResponse processMessage(
+      SCMBlockLocationRequest request, String traceId) throws ServiceException {
     SCMBlockLocationResponse.Builder response = createSCMBlockResponse(
         request.getCmdType(),
         traceId);
     response.setSuccess(true);
     response.setStatus(Status.OK);
 
-    try(Scope scope = TracingUtil
+    try {
-        .importAndCreateScope("ScmBlockLocationProtocol."+request.getCmdType(),
-            request.getTraceID())) {
       switch (request.getCmdType()) {
       case AllocateScmBlock:
         response.setAllocateScmBlockResponse(
@@ -125,7 +154,7 @@ public SCMBlockLocationResponse send(RpcController controller,
         break;
       default:
         // Should never happen
-        throw new IOException("Unknown Operation "+request.getCmdType()+
+        throw new IOException("Unknown Operation " + request.getCmdType() +
             " in ScmBlockLocationProtocol");
       }
     } catch (IOException e) {
@@ -135,6 +164,7 @@ public SCMBlockLocationResponse send(RpcController controller,
         response.setMessage(e.getMessage());
       }
     }
+
     return response.build();
   }
 
@@ -182,12 +212,12 @@ public DeleteScmKeyBlocksResponseProto deleteScmKeyBlocks(
         .map(BlockGroup::getFromProto).collect(Collectors.toList());
     final List<DeleteBlockGroupResult> results =
         impl.deleteKeyBlocks(infoList);
-    for (DeleteBlockGroupResult result: results) {
+    for (DeleteBlockGroupResult result : results) {
       DeleteKeyBlocksResultProto.Builder deleteResult =
           DeleteKeyBlocksResultProto
-          .newBuilder()
+              .newBuilder()
-          .setObjectKey(result.getObjectKey())
+              .setObjectKey(result.getObjectKey())
-          .addAllBlockResults(result.getBlockResultProtoList());
+              .addAllBlockResults(result.getBlockResultProtoList());
       resp.addResults(deleteResult.build());
     }
     return resp.build();

hadoop-hdds/common/src/main/resources/ozone-default.xml

@@ -331,7 +331,7 @@
 
   <property>
     <name>hdds.prometheus.endpoint.enabled</name>
-    <value>false</value>
+    <value>true</value>
     <tag>OZONE, MANAGEMENT</tag>
     <description>Enable prometheus compatible metric page on the HTTP
       servers.

hadoop-hdds/config/src/main/java/org/apache/hadoop/hdds/conf/ConfigFileGenerator.java

@@ -93,15 +93,16 @@ public boolean process(Set<? extends TypeElement> annotations,
           }
 
         }
-        FileObject resource = filer
-            .createResource(StandardLocation.CLASS_OUTPUT, "",
-                OUTPUT_FILE_NAME);
-
-        try (Writer writer = new OutputStreamWriter(
-            resource.openOutputStream(), StandardCharsets.UTF_8)) {
-          appender.write(writer);
-        }
       }
+      FileObject resource = filer
+          .createResource(StandardLocation.CLASS_OUTPUT, "",
+              OUTPUT_FILE_NAME);
+
+      try (Writer writer = new OutputStreamWriter(
+          resource.openOutputStream(), StandardCharsets.UTF_8)) {
+        appender.write(writer);
+      }
+
     } catch (IOException e) {
       processingEnv.getMessager().printMessage(Kind.ERROR,
           "Can't generate the config file from annotation: " + e.getMessage());
@@ -109,5 +110,4 @@ public boolean process(Set<? extends TypeElement> annotations,
     return false;
   }
 
-
 }

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

@@ -26,6 +26,7 @@
 import org.apache.hadoop.http.HttpServer2;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.net.NetUtils;
+
 import org.eclipse.jetty.webapp.WebAppContext;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -92,8 +93,9 @@ public BaseHttpServer(Configuration conf, String name) throws IOException {
       httpServer = builder.build();
       httpServer.addServlet("conf", "/conf", HddsConfServlet.class);
 
+      httpServer.addServlet("logstream", "/logstream", LogStreamServlet.class);
       prometheusSupport =
-          conf.getBoolean(HddsConfigKeys.HDDS_PROMETHEUS_ENABLED, false);
+          conf.getBoolean(HddsConfigKeys.HDDS_PROMETHEUS_ENABLED, true);
 
       profilerSupport =
           conf.getBoolean(HddsConfigKeys.HDDS_PROFILER_ENABLED, false);

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

@@ -0,0 +1,58 @@
+/*
+ * 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.server;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+import org.apache.log4j.Level;
+import org.apache.log4j.Logger;
+import org.apache.log4j.PatternLayout;
+import org.apache.log4j.WriterAppender;
+
+/**
+ * Servlet to stream the current logs to the response.
+ */
+public class LogStreamServlet extends HttpServlet {
+
+  private static final String PATTERN = "%d [%p|%c|%C{1}] %m%n";
+
+  @Override
+  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+      throws ServletException, IOException {
+
+    WriterAppender appender =
+        new WriterAppender(new PatternLayout(PATTERN), resp.getWriter());
+    appender.setThreshold(Level.TRACE);
+
+    try {
+      Logger.getRootLogger().addAppender(appender);
+      try {
+        Thread.sleep(Integer.MAX_VALUE);
+      } catch (InterruptedException e) {
+        //interrupted
+      }
+    } finally {
+      Logger.getRootLogger().removeAppender(appender);
+    }
+  }
+
+}

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

@@ -112,6 +112,10 @@ public String prometheusName(String recordName,
 
     String baseName = StringUtils.capitalize(recordName)
         + StringUtils.capitalize(metricName);
+    return normalizeName(baseName);
+  }
+
+  public static String normalizeName(String baseName) {
     String[] parts = SPLIT_PATTERN.split(baseName);
     String result = String.join("_", parts).toLowerCase();
     return REPLACE_PATTERN.matcher(result).replaceAll("_");

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

@@ -23,6 +23,8 @@
 import org.apache.hadoop.util.Time;
 
 import com.google.common.base.Preconditions;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -57,6 +59,8 @@ public class EventQueue implements EventPublisher, AutoCloseable {
 
   private boolean isRunning = true;
 
+  private static final Gson TRACING_SERIALIZER = new GsonBuilder().create();
+
   public <PAYLOAD, EVENT_TYPE extends Event<PAYLOAD>> void addHandler(
       EVENT_TYPE event, EventHandler<PAYLOAD> handler) {
     this.addHandler(event, handler, generateHandlerName(handler));
@@ -129,8 +133,6 @@ public <PAYLOAD, EVENT_TYPE extends Event<PAYLOAD>> void addHandler(
     executors.get(event).get(executor).add(handler);
   }
 
-
-
   /**
    * Route an event with payload to the right listener(s).
    *
@@ -159,11 +161,17 @@ public <PAYLOAD, EVENT_TYPE extends Event<PAYLOAD>> void fireEvent(
 
         for (EventHandler handler : executorAndHandlers.getValue()) {
           queuedCount.incrementAndGet();
-          if (LOG.isDebugEnabled()) {
+          if (LOG.isTraceEnabled()) {
+            LOG.debug(
+                "Delivering event {} to executor/handler {}: <json>{}</json>",
+                event.getName(),
+                executorAndHandlers.getKey().getName(),
+                TRACING_SERIALIZER.toJson(payload).replaceAll("\n", "\\\\n"));
+          } else if (LOG.isDebugEnabled()) {
             LOG.debug("Delivering event {} to executor/handler {}: {}",
                 event.getName(),
                 executorAndHandlers.getKey().getName(),
-                payload);
+                payload.getClass().getSimpleName());
           }
           executorAndHandlers.getKey()
               .onMessage(handler, payload, this);
@@ -232,6 +240,7 @@ public void processAll(long timeout) {
       }
     }
   }
+
   @Override
   public void close() {
 
@@ -250,5 +259,4 @@ public void close() {
     });
   }
 
-
 }

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/ReplicationManager.java

@@ -18,21 +18,34 @@
 
 package org.apache.hadoop.hdds.scm.container;
 
-import com.google.common.annotations.VisibleForTesting;
+import java.io.IOException;
-import com.google.protobuf.GeneratedMessage;
+import java.util.ArrayList;
-import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.StringJoiner;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
-import org.apache.hadoop.hdds.conf.ConfigType;
-import org.apache.hadoop.hdds.conf.ConfigGroup;
 import org.apache.hadoop.hdds.conf.Config;
+import org.apache.hadoop.hdds.conf.ConfigGroup;
+import org.apache.hadoop.hdds.conf.ConfigType;
 import org.apache.hadoop.hdds.protocol.DatanodeDetails;
 import org.apache.hadoop.hdds.protocol.proto.HddsProtos.LifeCycleState;
-import org.apache.hadoop.hdds.protocol.proto
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos.ContainerReplicaProto.State;
-    .StorageContainerDatanodeProtocolProtos.ContainerReplicaProto.State;
+import org.apache.hadoop.hdds.scm.container.placement.algorithms.ContainerPlacementPolicy;
-import org.apache.hadoop.hdds.scm.container.placement.algorithms
-    .ContainerPlacementPolicy;
 import org.apache.hadoop.hdds.scm.events.SCMEvents;
 import org.apache.hadoop.hdds.server.events.EventPublisher;
+import org.apache.hadoop.metrics2.MetricsCollector;
+import org.apache.hadoop.metrics2.MetricsInfo;
+import org.apache.hadoop.metrics2.MetricsSource;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.ozone.lock.LockManager;
 import org.apache.hadoop.ozone.protocol.commands.CloseContainerCommand;
 import org.apache.hadoop.ozone.protocol.commands.CommandForDatanode;
@@ -42,35 +55,27 @@
 import org.apache.hadoop.util.ExitUtil;
 import org.apache.hadoop.util.Time;
 
-import static org.apache.hadoop.hdds.conf.ConfigTag.*;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.protobuf.GeneratedMessage;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+import static org.apache.hadoop.hdds.conf.ConfigTag.OZONE;
+import static org.apache.hadoop.hdds.conf.ConfigTag.SCM;
 import org.apache.ratis.util.Preconditions;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.UUID;
-import java.util.function.Consumer;
-import java.util.function.Predicate;
-import java.util.stream.Collectors;
-
 /**
  * Replication Manager (RM) is the one which is responsible for making sure
  * that the containers are properly replicated. Replication Manager deals only
  * with Quasi Closed / Closed container.
  */
-public class ReplicationManager {
+public class ReplicationManager implements MetricsSource {
 
   private static final Logger LOG =
       LoggerFactory.getLogger(ReplicationManager.class);
 
+  public static final String METRICS_SOURCE_NAME = "SCMReplicationManager";
+
   /**
    * Reference to the ContainerManager.
    */
@@ -140,15 +145,20 @@ public ReplicationManager(final ReplicationManagerConfiguration conf,
     this.lockManager = lockManager;
     this.conf = conf;
     this.running = false;
-    this.inflightReplication = new HashMap<>();
+    this.inflightReplication = new ConcurrentHashMap<>();
-    this.inflightDeletion = new HashMap<>();
+    this.inflightDeletion = new ConcurrentHashMap<>();
   }
 
   /**
    * Starts Replication Monitor thread.
    */
   public synchronized void start() {
+
     if (!isRunning()) {
+      DefaultMetricsSystem.instance().register(METRICS_SOURCE_NAME,
+          "SCM Replication manager (closed container replication) related "
+              + "metrics",
+          this);
       LOG.info("Starting Replication Monitor Thread.");
       running = true;
       replicationMonitor = new Thread(this::run);
@@ -472,6 +482,8 @@ private void forceCloseContainer(final ContainerInfo container,
    */
   private void handleUnderReplicatedContainer(final ContainerInfo container,
       final Set<ContainerReplica> replicas) {
+    LOG.debug("Handling underreplicated container: {}",
+        container.getContainerID());
     try {
       final ContainerID id = container.containerID();
       final List<DatanodeDetails> deletionInFlight = inflightDeletion
@@ -748,6 +760,16 @@ private static boolean compareState(final LifeCycleState containerState,
     }
   }
 
+  @Override
+  public void getMetrics(MetricsCollector collector, boolean all) {
+    collector.addRecord(ReplicationManager.class.getSimpleName())
+        .addGauge(ReplicationManagerMetrics.INFLIGHT_REPLICATION,
+            inflightReplication.size())
+        .addGauge(ReplicationManagerMetrics.INFLIGHT_DELETION,
+            inflightDeletion.size())
+        .endRecord();
+  }
+
   /**
    * Wrapper class to hold the InflightAction with its start time.
    */
@@ -822,4 +844,32 @@ public long getEventTimeout() {
       return eventTimeout;
     }
   }
+
+  /**
+   * Metric name definitions for Replication manager.
+   */
+  public enum ReplicationManagerMetrics implements MetricsInfo {
+
+    INFLIGHT_REPLICATION("Tracked inflight container replication requests."),
+    INFLIGHT_DELETION("Tracked inflight container deletion requests.");
+
+    private final String desc;
+
+    ReplicationManagerMetrics(String desc) {
+      this.desc = desc;
+    }
+
+    @Override
+    public String description() {
+      return desc;
+    }
+
+    @Override
+    public String toString() {
+      return new StringJoiner(", ", this.getClass().getSimpleName() + "{", "}")
+          .add("name=" + name())
+          .add("description=" + desc)
+          .toString();
+    }
+  }
 }

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/NodeReportHandler.java

@@ -48,7 +48,6 @@ public void onMessage(NodeReportFromDatanode nodeReportFromDatanode,
     DatanodeDetails dn = nodeReportFromDatanode.getDatanodeDetails();
     Preconditions.checkNotNull(dn, "NodeReport is "
         + "missing DatanodeDetails.");
-    LOGGER.trace("Processing node report for dn: {}", dn);
     nodeManager
         .processNodeReport(dn, nodeReportFromDatanode.getReport());
   }

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/SCMNodeManager.java

@@ -17,52 +17,6 @@
  */
 package org.apache.hadoop.hdds.scm.node;
 
-import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Preconditions;
-import com.google.common.base.Strings;
-import org.apache.hadoop.hdds.protocol.proto
-    .StorageContainerDatanodeProtocolProtos;
-import org.apache.hadoop.hdds.protocol.proto
-        .StorageContainerDatanodeProtocolProtos.PipelineReportsProto;
-import org.apache.hadoop.hdds.scm.container.ContainerID;
-import org.apache.hadoop.hdds.scm.net.NetworkTopology;
-import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
-import org.apache.hadoop.hdds.scm.pipeline.PipelineID;
-import org.apache.hadoop.hdds.scm.node.states.NodeAlreadyExistsException;
-import org.apache.hadoop.hdds.scm.node.states.NodeNotFoundException;
-import org.apache.hadoop.hdds.scm.server.SCMStorageConfig;
-import org.apache.hadoop.hdds.scm.VersionInfo;
-import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeMetric;
-import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
-import org.apache.hadoop.hdds.server.events.EventPublisher;
-import org.apache.hadoop.hdds.conf.OzoneConfiguration;
-import org.apache.hadoop.hdds.protocol.DatanodeDetails;
-import org.apache.hadoop.hdds.protocol.proto.HddsProtos.NodeState;
-import org.apache.hadoop.hdds.protocol.proto
-    .StorageContainerDatanodeProtocolProtos.NodeReportProto;
-import org.apache.hadoop.hdds.protocol.proto
-    .StorageContainerDatanodeProtocolProtos.SCMRegisteredResponseProto
-    .ErrorCode;
-import org.apache.hadoop.hdds.protocol.proto
-    .StorageContainerDatanodeProtocolProtos.StorageReportProto;
-import org.apache.hadoop.hdds.protocol.proto
-    .StorageContainerDatanodeProtocolProtos.SCMVersionRequestProto;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.ipc.Server;
-import org.apache.hadoop.metrics2.util.MBeans;
-import org.apache.hadoop.net.CachedDNSToSwitchMapping;
-import org.apache.hadoop.net.DNSToSwitchMapping;
-import org.apache.hadoop.net.TableMapping;
-import org.apache.hadoop.ozone.OzoneConsts;
-import org.apache.hadoop.ozone.protocol.VersionResponse;
-import org.apache.hadoop.ozone.protocol.commands.CommandForDatanode;
-import org.apache.hadoop.ozone.protocol.commands.RegisteredCommand;
-import org.apache.hadoop.ozone.protocol.commands.SCMCommand;
-
-import org.apache.hadoop.util.ReflectionUtils;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import javax.management.ObjectName;
 import java.io.IOException;
 import java.net.InetAddress;
@@ -76,6 +30,45 @@
 import java.util.concurrent.ScheduledFuture;
 import java.util.stream.Collectors;
 
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos.NodeState;
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos;
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos.NodeReportProto;
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos.PipelineReportsProto;
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos.SCMRegisteredResponseProto.ErrorCode;
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos.SCMVersionRequestProto;
+import org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos.StorageReportProto;
+import org.apache.hadoop.hdds.scm.VersionInfo;
+import org.apache.hadoop.hdds.scm.container.ContainerID;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeMetric;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
+import org.apache.hadoop.hdds.scm.net.NetworkTopology;
+import org.apache.hadoop.hdds.scm.node.states.NodeAlreadyExistsException;
+import org.apache.hadoop.hdds.scm.node.states.NodeNotFoundException;
+import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
+import org.apache.hadoop.hdds.scm.pipeline.PipelineID;
+import org.apache.hadoop.hdds.scm.server.SCMStorageConfig;
+import org.apache.hadoop.hdds.server.events.EventPublisher;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.ipc.Server;
+import org.apache.hadoop.metrics2.util.MBeans;
+import org.apache.hadoop.net.CachedDNSToSwitchMapping;
+import org.apache.hadoop.net.DNSToSwitchMapping;
+import org.apache.hadoop.net.TableMapping;
+import org.apache.hadoop.ozone.OzoneConsts;
+import org.apache.hadoop.ozone.protocol.VersionResponse;
+import org.apache.hadoop.ozone.protocol.commands.CommandForDatanode;
+import org.apache.hadoop.ozone.protocol.commands.RegisteredCommand;
+import org.apache.hadoop.ozone.protocol.commands.SCMCommand;
+import org.apache.hadoop.util.ReflectionUtils;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * Maintains information about the Datanodes on SCM side.
  * <p>
@@ -322,6 +315,15 @@ public Boolean isNodeRegistered(DatanodeDetails datanodeDetails) {
   @Override
   public void processNodeReport(DatanodeDetails datanodeDetails,
                                 NodeReportProto nodeReport) {
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("Processing node report from [datanode={}]",
+          datanodeDetails.getHostName());
+    }
+    if (LOG.isTraceEnabled()) {
+      LOG.trace("HB is received from [datanode={}]: <json>{}</json>",
+          datanodeDetails.getHostName(),
+          nodeReport.toString().replaceAll("\n", "\\\\n"));
+    }
     try {
       DatanodeInfo datanodeInfo = nodeStateManager.getNode(datanodeDetails);
       if (nodeReport != null) {

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/server/SCMBlockProtocolServer.java

@@ -21,9 +21,14 @@
  */
 package org.apache.hadoop.hdds.scm.server;
 
-import com.google.common.collect.Maps;
+import java.io.IOException;
-import com.google.protobuf.BlockingService;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
 import org.apache.hadoop.fs.CommonConfigurationKeys;
+import org.apache.hadoop.hdds.client.BlockID;
 import org.apache.hadoop.hdds.conf.OzoneConfiguration;
 import org.apache.hadoop.hdds.protocol.DatanodeDetails;
 import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
@@ -50,29 +55,20 @@
 import org.apache.hadoop.ozone.audit.Auditor;
 import org.apache.hadoop.ozone.audit.SCMAction;
 import org.apache.hadoop.ozone.common.BlockGroup;
-import org.apache.hadoop.hdds.client.BlockID;
 import org.apache.hadoop.ozone.common.DeleteBlockGroupResult;
-import org.apache.hadoop.ozone.protocolPB
+import org.apache.hadoop.ozone.protocolPB.ProtocolMessageMetrics;
-    .ScmBlockLocationProtocolServerSideTranslatorPB;
+import org.apache.hadoop.ozone.protocolPB.ScmBlockLocationProtocolServerSideTranslatorPB;
+
+import com.google.common.collect.Maps;
+import com.google.protobuf.BlockingService;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_HANDLER_COUNT_DEFAULT;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_HANDLER_COUNT_KEY;
+import static org.apache.hadoop.hdds.scm.server.StorageContainerManager.startRpcServer;
+import static org.apache.hadoop.hdds.server.ServerUtils.updateRPCListenAddress;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.IOException;
-import java.net.InetSocketAddress;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-
-import static org.apache.hadoop.hdds.scm.ScmConfigKeys
-    .OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY;
-import static org.apache.hadoop.hdds.scm.ScmConfigKeys
-    .OZONE_SCM_HANDLER_COUNT_DEFAULT;
-import static org.apache.hadoop.hdds.scm.ScmConfigKeys
-    .OZONE_SCM_HANDLER_COUNT_KEY;
-import static org.apache.hadoop.hdds.server.ServerUtils.updateRPCListenAddress;
-import static org.apache.hadoop.hdds.scm.server.StorageContainerManager
-    .startRpcServer;
-
 /**
  * SCM block protocol is the protocol used by Namenode and OzoneManager to get
  * blocks from the SCM.
@@ -89,6 +85,8 @@ public class SCMBlockProtocolServer implements
   private final OzoneConfiguration conf;
   private final RPC.Server blockRpcServer;
   private final InetSocketAddress blockRpcAddress;
+  private final ProtocolMessageMetrics
+      protocolMessageMetrics;
 
   /**
    * The RPC server that listens to requests from block service clients.
@@ -103,11 +101,18 @@ public SCMBlockProtocolServer(OzoneConfiguration conf,
 
     RPC.setProtocolEngine(conf, ScmBlockLocationProtocolPB.class,
         ProtobufRpcEngine.class);
+
+    protocolMessageMetrics =
+        ProtocolMessageMetrics.create("ScmBlockLocationProtocol",
+            "SCM Block location protocol counters",
+            ScmBlockLocationProtocolProtos.Type.values());
+
     // SCM Block Service RPC.
     BlockingService blockProtoPbService =
         ScmBlockLocationProtocolProtos.ScmBlockLocationProtocolService
             .newReflectiveBlockingService(
-                new ScmBlockLocationProtocolServerSideTranslatorPB(this));
+                new ScmBlockLocationProtocolServerSideTranslatorPB(this,
+                    protocolMessageMetrics));
 
     final InetSocketAddress scmBlockAddress = HddsServerUtil
         .getScmBlockClientBindAddress(conf);
@@ -137,6 +142,7 @@ public InetSocketAddress getBlockRpcAddress() {
   }
 
   public void start() {
+    protocolMessageMetrics.register();
     LOG.info(
         StorageContainerManager.buildRpcServerStartMessage(
             "RPC server for Block Protocol", getBlockRpcAddress()));
@@ -145,6 +151,7 @@ public void start() {
 
   public void stop() {
     try {
+      protocolMessageMetrics.unregister();
       LOG.info("Stopping the RPC server for Block Protocol");
       getBlockRpcServer().stop();
     } catch (Exception ex) {

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

@@ -24,13 +24,16 @@
 import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos;
 import org.apache.hadoop.hdds.scm.TestUtils;
 import org.apache.hadoop.hdds.scm.node.NodeManager;
+import org.apache.hadoop.ozone.protocolPB.ProtocolMessageMetrics;
 import org.apache.hadoop.ozone.protocolPB
     .ScmBlockLocationProtocolServerSideTranslatorPB;
 import org.apache.hadoop.test.GenericTestUtils;
+
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
+import org.mockito.Mockito;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -39,7 +42,7 @@
 
 /**
  * Test class for @{@link SCMBlockProtocolServer}.
- * */
+ */
 public class TestSCMBlockProtocolServer {
   private OzoneConfiguration config;
   private SCMBlockProtocolServer server;
@@ -64,7 +67,8 @@ public void setUp() throws Exception {
 
     }
     server = scm.getBlockProtocolServer();
-    service = new ScmBlockLocationProtocolServerSideTranslatorPB(server);
+    service = new ScmBlockLocationProtocolServerSideTranslatorPB(server,
+        Mockito.mock(ProtocolMessageMetrics.class));
   }
 
   @After

hadoop-ozone/common/src/main/bin/ozone

@@ -51,6 +51,7 @@ function hadoop_usage
   hadoop_add_subcommand "scmcli" client "run the CLI of the Storage Container Manager"
   hadoop_add_subcommand "sh" client "command line interface for object store operations"
   hadoop_add_subcommand "s3" client "command line interface for s3 related operations"
+  hadoop_add_subcommand "insight" client "tool to get runtime opeartion information"
   hadoop_add_subcommand "version" client "print the version"
   hadoop_add_subcommand "dtutil" client "operations related to delegation tokens"
   hadoop_add_subcommand "upgrade" client "HDFS to Ozone in-place upgrade tool"
@@ -175,6 +176,11 @@ function ozonecmd_case
       HADOOP_OPTS="${HADOOP_OPTS} ${HDFS_SCM_CLI_OPTS}"
       OZONE_RUN_ARTIFACT_NAME="hadoop-hdds-tools"
     ;;
+    insight)
+      HADOOP_CLASSNAME=org.apache.hadoop.ozone.insight.Insight
+      HADOOP_OPTS="${HADOOP_OPTS} ${HDFS_SCM_CLI_OPTS}"
+      OZONE_RUN_ARTIFACT_NAME="hadoop-ozone-insight"
+    ;;
     version)
       HADOOP_CLASSNAME=org.apache.hadoop.ozone.util.OzoneVersionInfo
       OZONE_RUN_ARTIFACT_NAME="hadoop-ozone-common"

hadoop-ozone/dev-support/intellij/ozone-site.xml

@@ -63,4 +63,8 @@
     <name>hdds.datanode.storage.utilization.critical.threshold</name>
     <value>0.99</value>
   </property>
+  <property>
+    <name>hdds.prometheus.endpoint.enabled</name>
+    <value>true</value>
+  </property>
 </configuration>

hadoop-ozone/dist/pom.xml

@@ -136,6 +136,14 @@
                   <type>cp</type>
                   <destFileName>hadoop-ozone-upgrade.classpath</destFileName>
                 </artifactItem>
+                <artifactItem>
+                  <groupId>org.apache.hadoop</groupId>
+                  <artifactId>hadoop-ozone-insight</artifactId>
+                  <version>${ozone.version}</version>
+                  <classifier>classpath</classifier>
+                  <type>cp</type>
+                  <destFileName>hadoop-ozone-insight.classpath</destFileName>
+                </artifactItem>
               </artifactItems>
             </configuration>
           </execution>
@@ -326,6 +334,10 @@
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-ozone-upgrade</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-ozone-insight</artifactId>
+    </dependency>
   </dependencies>
   <profiles>
     <profile>

hadoop-ozone/insight/dev-support/findbugsExcludeFile.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+   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.
+-->
+<FindBugsFilter>
+</FindBugsFilter>

hadoop-ozone/insight/pom.xml

@@ -0,0 +1,132 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed 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. See accompanying LICENSE file.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.apache.hadoop</groupId>
+    <artifactId>hadoop-ozone</artifactId>
+    <version>0.5.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>hadoop-ozone-insight</artifactId>
+  <version>0.5.0-SNAPSHOT</version>
+  <description>Apache Hadoop Ozone Insight Tool</description>
+  <name>Apache Hadoop Ozone Insight Tool</name>
+  <packaging>jar</packaging>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-ozone-ozone-manager</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-ozone-common</artifactId>
+    </dependency>
+    <!-- Genesis requires server side components -->
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-hdds-server-scm</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-ozone-client</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-ozone-filesystem</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-hdds-server-framework</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-common</artifactId>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-hdfs</artifactId>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.xml.bind</groupId>
+      <artifactId>jaxb-core</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>javax.xml.bind</groupId>
+      <artifactId>jaxb-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>javax.activation</groupId>
+      <artifactId>activation</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.dropwizard.metrics</groupId>
+      <artifactId>metrics-core</artifactId>
+      <version>3.2.4</version>
+    </dependency>
+    <dependency>
+      <groupId>org.openjdk.jmh</groupId>
+      <artifactId>jmh-core</artifactId>
+      <version>1.19</version>
+    </dependency>
+    <dependency>
+      <groupId>org.openjdk.jmh</groupId>
+      <artifactId>jmh-generator-annprocess</artifactId>
+      <version>1.19</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.code.findbugs</groupId>
+      <artifactId>findbugs</artifactId>
+      <version>3.0.1</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-common</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-ozone-integration-test</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>findbugs-maven-plugin</artifactId>
+        <configuration>
+          <excludeFilterFile>${basedir}/dev-support/findbugsExcludeFile.xml
+          </excludeFilterFile>
+          <fork>true</fork>
+          <maxHeap>2048</maxHeap>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/BaseInsightPoint.java

@@ -0,0 +1,188 @@
+/*
+ * 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.insight;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.hadoop.conf.StorageUnit;
+import org.apache.hadoop.hdds.HddsUtils;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.XceiverClientManager;
+import org.apache.hadoop.hdds.scm.client.ContainerOperationClient;
+import org.apache.hadoop.hdds.scm.client.ScmClient;
+import org.apache.hadoop.hdds.scm.protocol.StorageContainerLocationProtocol;
+import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolClientSideTranslatorPB;
+import org.apache.hadoop.hdds.scm.protocolPB.StorageContainerLocationProtocolPB;
+import org.apache.hadoop.hdds.server.PrometheusMetricsSink;
+import org.apache.hadoop.hdds.tracing.TracingUtil;
+import org.apache.hadoop.ipc.Client;
+import org.apache.hadoop.ipc.ProtobufRpcEngine;
+import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.ozone.OzoneConsts;
+import org.apache.hadoop.ozone.insight.LoggerSource.Level;
+import org.apache.hadoop.security.UserGroupInformation;
+
+import com.google.protobuf.ProtocolMessageEnum;
+import static org.apache.hadoop.hdds.HddsUtils.getScmAddressForClients;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_CONTAINER_SIZE;
+import static org.apache.hadoop.hdds.scm.ScmConfigKeys.OZONE_SCM_CONTAINER_SIZE_DEFAULT;
+
+/**
+ * Default implementation of Insight point logic.
+ */
+public abstract class BaseInsightPoint implements InsightPoint {
+
+  /**
+   * List the related metrics.
+   */
+  @Override
+  public List<MetricGroupDisplay> getMetrics() {
+    return new ArrayList<>();
+  }
+
+  /**
+   * List the related configuration.
+   */
+  @Override
+  public List<Class> getConfigurationClasses() {
+    return new ArrayList<>();
+  }
+
+  /**
+   * List the related loggers.
+   *
+   * @param verbose true if verbose logging is requested.
+   */
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    return loggers;
+  }
+
+  /**
+   * Create scm client.
+   */
+  public ScmClient createScmClient(OzoneConfiguration ozoneConf)
+      throws IOException {
+
+    if (!HddsUtils.getHostNameFromConfigKeys(ozoneConf,
+        ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY).isPresent()) {
+
+      throw new IllegalArgumentException(
+          ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY
+              + " should be set in ozone-site.xml");
+    }
+
+    long version = RPC.getProtocolVersion(
+        StorageContainerLocationProtocolPB.class);
+    InetSocketAddress scmAddress =
+        getScmAddressForClients(ozoneConf);
+    int containerSizeGB = (int) ozoneConf.getStorageSize(
+        OZONE_SCM_CONTAINER_SIZE, OZONE_SCM_CONTAINER_SIZE_DEFAULT,
+        StorageUnit.GB);
+    ContainerOperationClient
+        .setContainerSizeB(containerSizeGB * OzoneConsts.GB);
+
+    RPC.setProtocolEngine(ozoneConf, StorageContainerLocationProtocolPB.class,
+        ProtobufRpcEngine.class);
+    StorageContainerLocationProtocol client =
+        TracingUtil.createProxy(
+            new StorageContainerLocationProtocolClientSideTranslatorPB(
+                RPC.getProxy(StorageContainerLocationProtocolPB.class, version,
+                    scmAddress, UserGroupInformation.getCurrentUser(),
+                    ozoneConf,
+                    NetUtils.getDefaultSocketFactory(ozoneConf),
+                    Client.getRpcTimeout(ozoneConf))),
+            StorageContainerLocationProtocol.class, ozoneConf);
+    return new ContainerOperationClient(
+        client, new XceiverClientManager(ozoneConf));
+  }
+
+  /**
+   * Convenient method to define default log levels.
+   */
+  public Level defaultLevel(boolean verbose) {
+    return verbose ? Level.TRACE : Level.DEBUG;
+  }
+
+  /**
+   * Default metrics for any message type based RPC ServerSide translators.
+   */
+  public void addProtocolMessageMetrics(List<MetricGroupDisplay> metrics,
+      String prefix,
+      Component.Type component,
+      ProtocolMessageEnum[] types) {
+
+    MetricGroupDisplay messageTypeCounters =
+        new MetricGroupDisplay(component, "Message type counters");
+    for (ProtocolMessageEnum type : types) {
+      String typeName = type.toString();
+      MetricDisplay metricDisplay = new MetricDisplay("Number of " + typeName,
+          prefix + "_" + PrometheusMetricsSink
+              .normalizeName(typeName));
+      messageTypeCounters.addMetrics(metricDisplay);
+    }
+    metrics.add(messageTypeCounters);
+  }
+
+  /**
+   * Rpc metrics for any hadoop rpc endpoint.
+   */
+  public void addRpcMetrics(List<MetricGroupDisplay> metrics,
+      Component.Type component,
+      Map<String, String> filter) {
+    MetricGroupDisplay connection =
+        new MetricGroupDisplay(component, "RPC connections");
+    connection.addMetrics(new MetricDisplay("Open connections",
+        "rpc_num_open_connections", filter));
+    connection.addMetrics(
+        new MetricDisplay("Dropped connections", "rpc_num_dropped_connections",
+            filter));
+    connection.addMetrics(
+        new MetricDisplay("Received bytes", "rpc_received_bytes",
+            filter));
+    connection.addMetrics(
+        new MetricDisplay("Sent bytes", "rpc_sent_bytes",
+            filter));
+    metrics.add(connection);
+
+    MetricGroupDisplay queue = new MetricGroupDisplay(component, "RPC queue");
+    queue.addMetrics(new MetricDisplay("RPC average queue time",
+        "rpc_rpc_queue_time_avg_time", filter));
+    queue.addMetrics(
+        new MetricDisplay("RPC call queue length", "rpc_call_queue_length",
+            filter));
+    metrics.add(queue);
+
+    MetricGroupDisplay performance =
+        new MetricGroupDisplay(component, "RPC performance");
+    performance.addMetrics(new MetricDisplay("RPC processing time average",
+        "rpc_rpc_processing_time_avg_time", filter));
+    performance.addMetrics(
+        new MetricDisplay("Number of slow calls", "rpc_rpc_slow_calls",
+            filter));
+    metrics.add(performance);
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/BaseInsightSubCommand.java

@@ -0,0 +1,101 @@
+/*
+ * 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.insight;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import org.apache.hadoop.hdds.HddsUtils;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.om.KeyManagerInsight;
+import org.apache.hadoop.ozone.insight.om.OmProtocolInsight;
+import org.apache.hadoop.ozone.insight.scm.EventQueueInsight;
+import org.apache.hadoop.ozone.insight.scm.NodeManagerInsight;
+import org.apache.hadoop.ozone.insight.scm.ReplicaManagerInsight;
+import org.apache.hadoop.ozone.insight.scm.ScmProtocolBlockLocationInsight;
+import org.apache.hadoop.ozone.om.OMConfigKeys;
+
+import picocli.CommandLine;
+
+/**
+ * Parent class for all the insight subcommands.
+ */
+public class BaseInsightSubCommand {
+
+  @CommandLine.ParentCommand
+  private Insight insightCommand;
+
+  public InsightPoint getInsight(OzoneConfiguration configuration,
+      String selection) {
+    Map<String, InsightPoint> insights = createInsightPoints(configuration);
+
+    if (!insights.containsKey(selection)) {
+      throw new RuntimeException(String
+          .format("No such component; %s. Available components: %s", selection,
+              insights.keySet()));
+    }
+    return insights.get(selection);
+  }
+
+  /**
+   * Utility to get the host base on a component.
+   */
+  public String getHost(OzoneConfiguration conf, Component component) {
+    if (component.getHostname() != null) {
+      return "http://" + component.getHostname() + ":" + component.getPort();
+    } else if (component.getName() == Type.SCM) {
+      Optional<String> scmHost =
+          HddsUtils.getHostNameFromConfigKeys(conf,
+              ScmConfigKeys.OZONE_SCM_BLOCK_CLIENT_ADDRESS_KEY,
+              ScmConfigKeys.OZONE_SCM_CLIENT_ADDRESS_KEY);
+
+      return "http://" + scmHost.get() + ":9876";
+    } else if (component.getName() == Type.OM) {
+      Optional<String> omHost =
+          HddsUtils.getHostNameFromConfigKeys(conf,
+              OMConfigKeys.OZONE_OM_ADDRESS_KEY);
+      return "http://" + omHost.get() + ":9874";
+    } else {
+      throw new IllegalArgumentException(
+          "Component type is not supported: " + component.getName());
+    }
+
+  }
+
+  public Map<String, InsightPoint> createInsightPoints(
+      OzoneConfiguration configuration) {
+    Map<String, InsightPoint> insights = new LinkedHashMap<>();
+    insights.put("scm.node-manager", new NodeManagerInsight());
+    insights.put("scm.replica-manager", new ReplicaManagerInsight());
+    insights.put("scm.event-queue", new EventQueueInsight());
+    insights.put("scm.protocol.block-location",
+        new ScmProtocolBlockLocationInsight());
+
+    insights.put("om.key-manager", new KeyManagerInsight());
+    insights.put("om.protocol.client", new OmProtocolInsight());
+
+    return insights;
+  }
+
+  public Insight getInsightCommand() {
+    return insightCommand;
+  }
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/Component.java

@@ -0,0 +1,116 @@
+/*
+ * 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.insight;
+
+import java.util.Objects;
+
+/**
+ * Identifier an ozone component.
+ */
+public class Component {
+
+  /**
+   * The type of the component (eg. scm, s3g...)
+   */
+  private Type name;
+
+  /**
+   * Unique identifier of the instance (uuid or index). Can be null for
+   * non-HA server component.
+   */
+  private String id;
+
+  /**
+   * Hostname of the component. Optional, may help to find the right host
+   * name.
+   */
+  private String hostname;
+
+  /**
+   * HTTP service port. Optional.
+   */
+  private int port;
+
+  public Component(Type name) {
+    this.name = name;
+  }
+
+  public Component(Type name, String id) {
+    this.name = name;
+    this.id = id;
+  }
+
+  public Component(Type name, String id, String hostname) {
+    this.name = name;
+    this.id = id;
+    this.hostname = hostname;
+  }
+
+  public Component(Type name, String id, String hostname, int port) {
+    this.name = name;
+    this.id = id;
+    this.hostname = hostname;
+    this.port = port;
+  }
+
+  public Type getName() {
+    return name;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getHostname() {
+    return hostname;
+  }
+
+  public int getPort() {
+    return port;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Component that = (Component) o;
+    return Objects.equals(name, that.name) &&
+        Objects.equals(id, that.id);
+  }
+
+  public String prefix() {
+    return name + (id != null && id.length() > 0 ? "-" + id : "");
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(name, id);
+  }
+
+  /**
+   * Ozone component types.
+   */
+  public enum Type {
+    SCM, OM, DATANODE, S3G, RECON;
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/ConfigurationSubCommand.java

@@ -0,0 +1,89 @@
+/*
+ * 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.insight;
+
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+import org.apache.hadoop.hdds.conf.Config;
+import org.apache.hadoop.hdds.conf.ConfigGroup;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.ozone.insight.Component.Type;
+
+import picocli.CommandLine;
+
+import java.lang.reflect.Method;
+import java.util.concurrent.Callable;
+
+/**
+ * Subcommand to show configuration values/documentation.
+ */
+@CommandLine.Command(
+    name = "config",
+    description = "Show configuration for a specific subcomponents",
+    mixinStandardHelpOptions = true,
+    versionProvider = HddsVersionProvider.class)
+public class ConfigurationSubCommand extends BaseInsightSubCommand
+    implements Callable<Void> {
+
+  @CommandLine.Parameters(description = "Name of the insight point (use list "
+      + "to check the available options)")
+  private String insightName;
+
+  @Override
+  public Void call() throws Exception {
+    InsightPoint insight =
+        getInsight(getInsightCommand().createOzoneConfiguration(), insightName);
+    System.out.println(
+        "Configuration for `" + insightName + "` (" + insight.getDescription()
+            + ")");
+    System.out.println();
+    for (Class clazz : insight.getConfigurationClasses()) {
+      showConfig(clazz);
+
+    }
+    return null;
+  }
+
+  private void showConfig(Class clazz) {
+    OzoneConfiguration conf = new OzoneConfiguration();
+    conf.addResource(getHost(conf, new Component(Type.SCM)) + "/conf");
+    ConfigGroup configGroup =
+        (ConfigGroup) clazz.getAnnotation(ConfigGroup.class);
+    if (configGroup == null) {
+      return;
+    }
+
+    String prefix = configGroup.prefix();
+
+    for (Method method : clazz.getMethods()) {
+      if (method.isAnnotationPresent(Config.class)) {
+        Config config = method.getAnnotation(Config.class);
+        String key = prefix + "." + config.key();
+        System.out.println(">>> " + key);
+        System.out.println("       default: " + config.defaultValue());
+        System.out.println("       current: " + conf.get(key));
+        System.out.println();
+        System.out.println(config.description());
+        System.out.println();
+        System.out.println();
+
+      }
+    }
+
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/Insight.java

@@ -0,0 +1,41 @@
+/*
+ * 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.insight;
+
+import org.apache.hadoop.hdds.cli.GenericCli;
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+
+import picocli.CommandLine;
+
+/**
+ * Command line utility to check logs/metrics of internal ozone components.
+ */
+@CommandLine.Command(name = "ozone insight",
+    hidden = true, description = "Show debug information about a selected "
+    + "Ozone component",
+    versionProvider = HddsVersionProvider.class,
+    subcommands = {ListSubCommand.class, LogSubcommand.class,
+        MetricsSubCommand.class, ConfigurationSubCommand.class},
+    mixinStandardHelpOptions = true)
+public class Insight extends GenericCli {
+
+  public static void main(String[] args) throws Exception {
+    new Insight().run(args);
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/InsightPoint.java

@@ -0,0 +1,49 @@
+/*
+ * 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.insight;
+
+import java.util.List;
+
+/**
+ * Definition of a specific insight points.
+ */
+public interface InsightPoint {
+
+  /**
+   * Human readdable description.
+   */
+  String getDescription();
+
+  /**
+   * List of the related loggers.
+   */
+  List<LoggerSource> getRelatedLoggers(boolean verbose);
+
+  /**
+   * List of the related metrics.
+   */
+  List<MetricGroupDisplay> getMetrics();
+
+  /**
+   * List of the configuration classes.
+   */
+  List<Class> getConfigurationClasses();
+
+
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/ListSubCommand.java

@@ -0,0 +1,59 @@
+/*
+ * 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.insight;
+
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+
+import picocli.CommandLine;
+
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.concurrent.Callable;
+
+/**
+ * Subcommand to list of the available insight points.
+ */
+@CommandLine.Command(
+    name = "list",
+    description = "Show available insight points.",
+    mixinStandardHelpOptions = true,
+    versionProvider = HddsVersionProvider.class)
+public class ListSubCommand extends BaseInsightSubCommand
+    implements Callable<Void> {
+
+  @CommandLine.Parameters(defaultValue = "")
+  private String insightPrefix;
+
+  @Override
+  public Void call() throws Exception {
+
+    System.out.println("Available insight points:\n\n");
+
+    Map<String, InsightPoint> insightPoints =
+        createInsightPoints(new OzoneConfiguration());
+    for (Entry<String, InsightPoint> entry : insightPoints.entrySet()) {
+      if (insightPrefix == null || entry.getKey().startsWith(insightPrefix)) {
+        System.out.println(String.format("  %-33s    %s", entry.getKey(),
+            entry.getValue().getDescription()));
+      }
+    }
+    return null;
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/LogSubcommand.java

@@ -0,0 +1,167 @@
+/*
+ * 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.insight;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.ozone.insight.LoggerSource.Level;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.HttpClientBuilder;
+import picocli.CommandLine;
+
+/**
+ * Subcommand to display log.
+ */
+@CommandLine.Command(
+    name = "log",
+    aliases = "logs",
+    description = "Show log4j events related to the insight point",
+    mixinStandardHelpOptions = true,
+    versionProvider = HddsVersionProvider.class)
+public class LogSubcommand extends BaseInsightSubCommand
+    implements Callable<Void> {
+
+  @CommandLine.Parameters(description = "Name of the insight point (use list "
+      + "to check the available options)")
+  private String insightName;
+
+  @CommandLine.Option(names = "-v", description = "Enable verbose mode to "
+      + "show more information / detailed message")
+  private boolean verbose;
+
+  @Override
+  public Void call() throws Exception {
+    OzoneConfiguration conf =
+        getInsightCommand().createOzoneConfiguration();
+    InsightPoint insight =
+        getInsight(conf, insightName);
+
+    List<LoggerSource> loggers = insight.getRelatedLoggers(verbose);
+
+    for (LoggerSource logger : loggers) {
+      setLogLevel(conf, logger.getLoggerName(), logger.getComponent(),
+          logger.getLevel());
+    }
+
+    Set<Component> sources = loggers.stream().map(LoggerSource::getComponent)
+        .collect(Collectors.toSet());
+    try {
+      streamLog(conf, sources, loggers);
+    } finally {
+      for (LoggerSource logger : loggers) {
+        setLogLevel(conf, logger.getLoggerName(), logger.getComponent(),
+            Level.INFO);
+      }
+    }
+    return null;
+  }
+
+  private void streamLog(OzoneConfiguration conf, Set<Component> sources,
+      List<LoggerSource> relatedLoggers) {
+    List<Thread> loggers = new ArrayList<>();
+    for (Component sourceComponent : sources) {
+      loggers.add(new Thread(
+          () -> streamLog(conf, sourceComponent, relatedLoggers)));
+    }
+    for (Thread thread : loggers) {
+      thread.start();
+    }
+    for (Thread thread : loggers) {
+      try {
+        thread.join();
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
+  private void streamLog(OzoneConfiguration conf, Component logComponent,
+      List<LoggerSource> loggers) {
+    HttpClient client = HttpClientBuilder.create().build();
+
+    HttpGet get = new HttpGet(getHost(conf, logComponent) + "/logstream");
+    try {
+      HttpResponse execute = client.execute(get);
+      try (BufferedReader bufferedReader = new BufferedReader(
+          new InputStreamReader(execute.getEntity().getContent(),
+              StandardCharsets.UTF_8))) {
+        bufferedReader.lines()
+            .filter(line -> {
+              for (LoggerSource logger : loggers) {
+                if (line.contains(logger.getLoggerName())) {
+                  return true;
+                }
+              }
+              return false;
+            })
+            .map(this::processLogLine)
+            .map(l -> "[" + logComponent.prefix() + "] " + l)
+            .forEach(System.out::println);
+      }
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public String processLogLine(String line) {
+    Pattern p = Pattern.compile("<json>(.*)</json>");
+    Matcher m = p.matcher(line);
+    StringBuffer sb = new StringBuffer();
+    while (m.find()) {
+      m.appendReplacement(sb, "\n" + m.group(1).replaceAll("\\\\n", "\n"));
+    }
+    m.appendTail(sb);
+    return sb.toString();
+  }
+
+  private void setLogLevel(OzoneConfiguration conf, String name,
+      Component component, LoggerSource.Level level) {
+    HttpClient client = HttpClientBuilder.create().build();
+
+    String request = String
+        .format("/logLevel?log=%s&level=%s", name,
+            level);
+    String hostName = getHost(conf, component);
+    HttpGet get = new HttpGet(hostName + request);
+    try {
+      HttpResponse execute = client.execute(get);
+      if (execute.getStatusLine().getStatusCode() != 200) {
+        throw new RuntimeException(
+            "Can't set the log level: " + hostName + " -> HTTP " + execute
+                .getStatusLine().getStatusCode());
+      }
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/LoggerSource.java

@@ -0,0 +1,72 @@
+/*
+ * 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.insight;
+
+import org.apache.hadoop.ozone.insight.Component.Type;
+
+/**
+ * Definition of a log source.
+ */
+public class LoggerSource {
+
+  /**
+   * Id of the component where the log is generated.
+   */
+  private Component component;
+
+  /**
+   * Log4j/slf4j logger name.
+   */
+  private String loggerName;
+
+  /**
+   * Log level.
+   */
+  private Level level;
+
+  public LoggerSource(Component component, String loggerName, Level level) {
+    this.component = component;
+    this.loggerName = loggerName;
+    this.level = level;
+  }
+
+  public LoggerSource(Type componentType, Class<?> loggerClass,
+      Level level) {
+    this(new Component(componentType), loggerClass.getCanonicalName(), level);
+  }
+
+  public Component getComponent() {
+    return component;
+  }
+
+  public String getLoggerName() {
+    return loggerName;
+  }
+
+  public Level getLevel() {
+    return level;
+  }
+
+  /**
+   * Log level definition.
+   */
+  public enum Level {
+    TRACE, DEBUG, INFO, WARN, ERROR
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/MetricDisplay.java

@@ -0,0 +1,69 @@
+/*
+ * 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.insight;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Definition of one displayable hadoop metrics.
+ */
+public class MetricDisplay {
+
+  /**
+   * Prometheus metrics name.
+   */
+  private String id;
+
+  /**
+   * Human readable definition of the metrhics.
+   */
+  private String description;
+
+  /**
+   * Prometheus metrics tag to filter out the right metrics.
+   */
+  private Map<String, String> filter;
+
+  public MetricDisplay(String description, String id) {
+    this(description, id, new HashMap<>());
+  }
+
+  public MetricDisplay(String description, String id,
+      Map<String, String> filter) {
+    this.id = id;
+    this.description = description;
+    this.filter = filter;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Map<String, String> getFilter() {
+    return filter;
+  }
+
+  public boolean checkLine(String line) {
+    return false;
+  }
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/MetricGroupDisplay.java

@@ -0,0 +1,69 @@
+/*
+ * 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.insight;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.hadoop.ozone.insight.Component.Type;
+
+/**
+ * Definition of a group of metrics which can be displayed.
+ */
+public class MetricGroupDisplay {
+
+  /**
+   * List fhe included metrics.
+   */
+  private List<MetricDisplay> metrics = new ArrayList<>();
+
+  /**
+   * Name of the component which includes the metrics (scm, om,...).
+   */
+  private Component component;
+
+  /**
+   * Human readable description.
+   */
+  private String description;
+
+  public MetricGroupDisplay(Component component, String description) {
+    this.component = component;
+    this.description = description;
+  }
+
+  public MetricGroupDisplay(Type componentType, String metricName) {
+    this(new Component(componentType), metricName);
+  }
+
+  public List<MetricDisplay> getMetrics() {
+    return metrics;
+  }
+
+  public void addMetrics(MetricDisplay item) {
+    this.metrics.add(item);
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public Component getComponent() {
+    return component;
+  }
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/MetricsSubCommand.java

@@ -0,0 +1,132 @@
+/*
+ * 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.insight;
+
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.HttpClientBuilder;
+import picocli.CommandLine;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.*;
+import java.util.Map.Entry;
+import java.util.concurrent.Callable;
+import java.util.stream.Collectors;
+
+/**
+ * Command line interface to show metrics for a specific component.
+ */
+@CommandLine.Command(
+    name = "metrics",
+    aliases = "metric",
+    description = "Show available metrics.",
+    mixinStandardHelpOptions = true,
+    versionProvider = HddsVersionProvider.class)
+public class MetricsSubCommand extends BaseInsightSubCommand
+    implements Callable<Void> {
+
+  @CommandLine.Parameters(description = "Name of the insight point (use list "
+      + "to check the available options)")
+  private String insightName;
+
+  @Override
+  public Void call() throws Exception {
+    OzoneConfiguration conf =
+        getInsightCommand().createOzoneConfiguration();
+    InsightPoint insight =
+        getInsight(conf, insightName);
+    Set<Component> sources =
+        insight.getMetrics().stream().map(MetricGroupDisplay::getComponent)
+            .collect(Collectors.toSet());
+    Map<Component, List<String>> metrics = getMetrics(conf, sources);
+    System.out.println(
+        "Metrics for `" + insightName + "` (" + insight.getDescription() + ")");
+    System.out.println();
+    for (MetricGroupDisplay group : insight.getMetrics()) {
+      System.out.println(group.getDescription());
+      System.out.println();
+      for (MetricDisplay display : group.getMetrics()) {
+        System.out.println("  " + display.getDescription() + ": " + selectValue(
+            metrics.get(group.getComponent()), display));
+      }
+      System.out.println();
+      System.out.println();
+
+    }
+    return null;
+  }
+
+  private Map<Component, List<String>> getMetrics(OzoneConfiguration conf,
+      Collection<Component> sources) {
+    Map<Component, List<String>> result = new HashMap<>();
+    for (Component source : sources) {
+      result.put(source, getMetrics(conf, source));
+    }
+    return result;
+  }
+
+  private String selectValue(List<String> metrics,
+      MetricDisplay metricDisplay) {
+    for (String line : metrics) {
+      if (line.startsWith(metricDisplay.getId())) {
+        boolean filtered = false;
+        for (Entry<String, String> filter : metricDisplay.getFilter()
+            .entrySet()) {
+          if (!line
+              .contains(filter.getKey() + "=\"" + filter.getValue() + "\"")) {
+            filtered = true;
+          }
+        }
+        if (!filtered) {
+          return line.split(" ")[1];
+        }
+      }
+    }
+    return "???";
+  }
+
+  private List<String> getMetrics(OzoneConfiguration conf,
+      Component component) {
+    HttpClient client = HttpClientBuilder.create().build();
+    HttpGet get = new HttpGet(getHost(conf, component) + "/prom");
+    try {
+      HttpResponse execute = client.execute(get);
+      if (execute.getStatusLine().getStatusCode() != 200) {
+        throw new RuntimeException(
+            "Can't read prometheus metrics endpoint" + execute.getStatusLine()
+                .getStatusCode());
+      }
+      try (BufferedReader bufferedReader = new BufferedReader(
+          new InputStreamReader(execute.getEntity().getContent(),
+              StandardCharsets.UTF_8))) {
+        return bufferedReader.lines().collect(Collectors.toList());
+      }
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/datanode/RatisInsight.java

@@ -0,0 +1,75 @@
+/*
+ * 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.insight.datanode;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.scm.client.ScmClient;
+import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.InsightPoint;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+
+/**
+ * Insight definition for datanode/pipline metrics.
+ */
+public class RatisInsight extends BaseInsightPoint implements InsightPoint {
+
+  private OzoneConfiguration conf;
+
+  public RatisInsight(OzoneConfiguration conf) {
+    this.conf = conf;
+  }
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> result = new ArrayList<>();
+    try {
+      ScmClient scmClient = createScmClient(conf);
+      Pipeline pipeline = scmClient.listPipelines()
+          .stream()
+          .filter(d -> d.getNodes().size() > 1)
+          .findFirst()
+          .get();
+      for (DatanodeDetails datanode : pipeline.getNodes()) {
+        Component dn =
+            new Component(Type.DATANODE, datanode.getUuid().toString(),
+                datanode.getHostName(), 9882);
+        result
+            .add(new LoggerSource(dn, "org.apache.ratis.server.impl",
+                defaultLevel(verbose)));
+      }
+    } catch (IOException e) {
+      throw new RuntimeException("Can't enumerate required logs", e);
+    }
+
+    return result;
+  }
+
+  @Override
+  public String getDescription() {
+    return "More information about one ratis datanode ring.";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/datanode/package-info.java

@@ -0,0 +1,23 @@
+/**
+ * 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.insight.datanode;
+
+/**
+ * Insight points for the ozone datanodes.
+ */

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/om/KeyManagerInsight.java

@@ -0,0 +1,78 @@
+/*
+ * 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.insight.om;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+import org.apache.hadoop.ozone.insight.MetricDisplay;
+import org.apache.hadoop.ozone.insight.MetricGroupDisplay;
+import org.apache.hadoop.ozone.om.KeyManagerImpl;
+
+/**
+ * Insight implementation for the key management related operations.
+ */
+public class KeyManagerInsight extends BaseInsightPoint {
+
+  @Override
+  public List<MetricGroupDisplay> getMetrics() {
+    List<MetricGroupDisplay> display = new ArrayList<>();
+
+    MetricGroupDisplay state =
+        new MetricGroupDisplay(Type.OM, "Key related metrics");
+    state
+        .addMetrics(new MetricDisplay("Number of keys", "om_metrics_num_keys"));
+    state.addMetrics(new MetricDisplay("Number of key operations",
+        "om_metrics_num_key_ops"));
+
+    display.add(state);
+
+    MetricGroupDisplay key =
+        new MetricGroupDisplay(Type.OM, "Key operation stats");
+    for (String operation : new String[] {"allocate", "commit", "lookup",
+        "list", "delete"}) {
+      key.addMetrics(new MetricDisplay(
+          "Number of key " + operation + "s (failure + success)",
+          "om_metrics_num_key_" + operation));
+      key.addMetrics(
+          new MetricDisplay("Number of failed key " + operation + "s",
+              "om_metrics_num_key_" + operation + "_fails"));
+    }
+    display.add(key);
+
+    return display;
+  }
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    loggers.add(
+        new LoggerSource(Type.OM, KeyManagerImpl.class,
+            defaultLevel(verbose)));
+    return loggers;
+  }
+
+  @Override
+  public String getDescription() {
+    return "OM Key Manager";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/om/OmProtocolInsight.java

@@ -0,0 +1,67 @@
+/*
+ * 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.insight.om;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+import org.apache.hadoop.ozone.insight.MetricGroupDisplay;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos;
+import org.apache.hadoop.ozone.protocolPB.OzoneManagerProtocolServerSideTranslatorPB;
+
+/**
+ * Insight definition for the OM RPC server.
+ */
+public class OmProtocolInsight extends BaseInsightPoint {
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    loggers.add(
+        new LoggerSource(Type.OM,
+            OzoneManagerProtocolServerSideTranslatorPB.class,
+            defaultLevel(verbose)));
+    return loggers;
+  }
+
+  @Override
+  public List<MetricGroupDisplay> getMetrics() {
+    List<MetricGroupDisplay> metrics = new ArrayList<>();
+
+    Map<String, String> filter = new HashMap<>();
+    filter.put("servername", "OzoneManagerService");
+
+    addRpcMetrics(metrics, Type.OM, filter);
+
+    addProtocolMessageMetrics(metrics, "om_client_protocol", Type.OM,
+        OzoneManagerProtocolProtos.Type.values());
+
+    return metrics;
+  }
+
+  @Override
+  public String getDescription() {
+    return "Ozone Manager RPC endpoint";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/om/package-info.java

@@ -0,0 +1,23 @@
+/**
+ * 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.insight.om;
+
+/**
+ * Insight points for the Ozone Manager.
+ */

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/package-info.java

@@ -0,0 +1,24 @@
+/**
+ * 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.insight;
+
+/**
+ * Framework to collect log/metrics and configuration for specified ozone
+ * components.
+ */

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/scm/EventQueueInsight.java

@@ -0,0 +1,47 @@
+/*
+ * 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.insight.scm;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.hadoop.hdds.server.events.EventQueue;
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+
+/**
+ * Insight definition to check internal events.
+ */
+public class EventQueueInsight extends BaseInsightPoint {
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    loggers
+        .add(new LoggerSource(Type.SCM, EventQueue.class,
+            defaultLevel(verbose)));
+    return loggers;
+  }
+
+  @Override
+  public String getDescription() {
+    return "Information about the internal async event delivery";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/scm/NodeManagerInsight.java

@@ -0,0 +1,74 @@
+/*
+ * 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.insight.scm;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.hadoop.hdds.scm.node.SCMNodeManager;
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+import org.apache.hadoop.ozone.insight.MetricDisplay;
+import org.apache.hadoop.ozone.insight.MetricGroupDisplay;
+
+/**
+ * Insight definition to check node manager / node report events.
+ */
+public class NodeManagerInsight extends BaseInsightPoint {
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    loggers.add(
+        new LoggerSource(Type.SCM, SCMNodeManager.class,
+            defaultLevel(verbose)));
+    return loggers;
+  }
+
+  @Override
+  public List<MetricGroupDisplay> getMetrics() {
+    List<MetricGroupDisplay> display = new ArrayList<>();
+
+    MetricGroupDisplay nodes =
+        new MetricGroupDisplay(Type.SCM, "Node counters");
+
+    nodes.addMetrics(
+        new MetricDisplay("Healthy Nodes", "scm_node_manager_healthy_nodes"));
+    nodes.addMetrics(
+        new MetricDisplay("Dead Nodes", "scm_node_manager_dead_nodes"));
+
+    display.add(nodes);
+
+    MetricGroupDisplay hb =
+        new MetricGroupDisplay(Type.SCM, "HB processing stats");
+    hb.addMetrics(
+        new MetricDisplay("HB processed", "scm_node_manager_num_hb_processed"));
+    hb.addMetrics(new MetricDisplay("HB processing failed",
+        "scm_node_manager_num_hb_processing_failed"));
+    display.add(hb);
+
+    return display;
+  }
+
+  @Override
+  public String getDescription() {
+    return "SCM Datanode management related information.";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/scm/ReplicaManagerInsight.java

@@ -0,0 +1,60 @@
+/*
+ * 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.insight.scm;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.hadoop.hdds.scm.container.ReplicationManager;
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+import org.apache.hadoop.ozone.insight.MetricGroupDisplay;
+
+/**
+ * Insight definition to chech the replication manager internal state.
+ */
+public class ReplicaManagerInsight extends BaseInsightPoint {
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    loggers.add(new LoggerSource(Type.SCM, ReplicationManager.class,
+        defaultLevel(verbose)));
+    return loggers;
+  }
+
+  @Override
+  public List<MetricGroupDisplay> getMetrics() {
+    List<MetricGroupDisplay> display = new ArrayList<>();
+    return display;
+  }
+
+  @Override
+  public List<Class> getConfigurationClasses() {
+    List<Class> result = new ArrayList<>();
+    result.add(ReplicationManager.ReplicationManagerConfiguration.class);
+    return result;
+  }
+
+  @Override
+  public String getDescription() {
+    return "SCM closed container replication manager";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/scm/ScmProtocolBlockLocationInsight.java

@@ -0,0 +1,71 @@
+/*
+ * 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.insight.scm;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.hadoop.hdds.protocol.proto.ScmBlockLocationProtocolProtos;
+import org.apache.hadoop.hdds.scm.server.SCMBlockProtocolServer;
+import org.apache.hadoop.ozone.insight.BaseInsightPoint;
+import org.apache.hadoop.ozone.insight.Component.Type;
+import org.apache.hadoop.ozone.insight.LoggerSource;
+import org.apache.hadoop.ozone.insight.MetricGroupDisplay;
+import org.apache.hadoop.ozone.protocolPB.ScmBlockLocationProtocolServerSideTranslatorPB;
+
+/**
+ * Insight metric to check the SCM block location protocol behaviour.
+ */
+public class ScmProtocolBlockLocationInsight extends BaseInsightPoint {
+
+  @Override
+  public List<LoggerSource> getRelatedLoggers(boolean verbose) {
+    List<LoggerSource> loggers = new ArrayList<>();
+    loggers.add(
+        new LoggerSource(Type.SCM,
+            ScmBlockLocationProtocolServerSideTranslatorPB.class,
+            defaultLevel(verbose)));
+    new LoggerSource(Type.SCM,
+        SCMBlockProtocolServer.class,
+        defaultLevel(verbose));
+    return loggers;
+  }
+
+  @Override
+  public List<MetricGroupDisplay> getMetrics() {
+    List<MetricGroupDisplay> metrics = new ArrayList<>();
+
+    Map<String, String> filter = new HashMap<>();
+    filter.put("servername", "StorageContainerLocationProtocolService");
+
+    addRpcMetrics(metrics, Type.SCM, filter);
+
+    addProtocolMessageMetrics(metrics, "scm_block_location_protocol",
+        Type.SCM, ScmBlockLocationProtocolProtos.Type.values());
+
+    return metrics;
+  }
+
+  @Override
+  public String getDescription() {
+    return "SCM Block location protocol endpoint";
+  }
+
+}

hadoop-ozone/insight/src/main/java/org/apache/hadoop/ozone/insight/scm/package-info.java

@@ -0,0 +1,23 @@
+/**
+ * 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.insight.scm;
+
+/**
+ * Insight points for the Storage Container Manager.
+ */

hadoop-ozone/insight/src/test/java/org/apache/hadoop/ozone/insight/LogSubcommandTest.java

@@ -0,0 +1,41 @@
+/*
+ * 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.insight;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Testing utility methods of the log subcommand test.
+ */
+public class LogSubcommandTest {
+
+  @Test
+  public void filterLog() {
+    LogSubcommand logSubcommand = new LogSubcommand();
+    String result = logSubcommand.processLogLine(
+        "2019-08-04 12:27:08,648 [TRACE|org.apache.hadoop.hdds.scm.node"
+            + ".SCMNodeManager|SCMNodeManager] HB is received from "
+            + "[datanode=localhost]: <json>storageReport {\\n  storageUuid: "
+            + "\"DS-29204db6-a615-4106-9dd4-ce294c2f4cf6\"\\n  "
+            + "storageLocation: \"/tmp/hadoop-elek/dfs/data\"\\n  capacity: "
+            + "8348086272\\n  scmUsed: 4096\\n  remaining: 8246956032n  "
+            + "storageType: DISK\\n  failed: falsen}\\n</json>\n");
+    Assert.assertEquals(3, result.split("\n").length);
+  }
+}

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManager.java

@@ -35,6 +35,7 @@
 import java.util.Objects;
 
 import org.apache.commons.codec.digest.DigestUtils;
+
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.StorageUnit;
 import org.apache.hadoop.crypto.key.KeyProvider;
@@ -82,9 +83,11 @@
 import org.apache.hadoop.ozone.om.protocol.OzoneManagerServerProtocol;
 import org.apache.hadoop.ozone.om.ratis.OMRatisSnapshotInfo;
 import org.apache.hadoop.ozone.om.snapshot.OzoneManagerSnapshotProvider;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos.DBUpdatesRequest;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .KeyArgs;
+import org.apache.hadoop.ozone.protocolPB.ProtocolMessageMetrics;
 import org.apache.hadoop.ozone.security.OzoneSecurityException;
 import org.apache.hadoop.ozone.security.OzoneTokenIdentifier;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
@@ -150,6 +153,7 @@
 import org.apache.hadoop.utils.db.SequenceNumberNotFoundException;
 import org.apache.hadoop.utils.db.DBCheckpoint;
 import org.apache.hadoop.utils.db.DBStore;
+
 import org.apache.ratis.server.protocol.TermIndex;
 import org.apache.ratis.util.FileUtils;
 import org.apache.ratis.util.LifeCycle;
@@ -253,6 +257,7 @@ public final class OzoneManager extends ServiceRuntimeInfoImpl
   private S3BucketManager s3BucketManager;
 
   private final OMMetrics metrics;
+  private final ProtocolMessageMetrics omClientProtocolMetrics;
   private OzoneManagerHttpServer httpServer;
   private final OMStorage omStorage;
   private final ScmBlockLocationProtocol scmBlockClient;
@@ -294,14 +299,12 @@ public final class OzoneManager extends ServiceRuntimeInfoImpl
   // execution, we can get from ozoneManager.
   private long maxUserVolumeCount;
 
-
   private final ScmClient scmClient;
   private final long scmBlockSize;
   private final int preallocateBlocksMax;
   private final boolean grpcBlockTokenEnabled;
   private final boolean useRatisForReplication;
 
-
   private OzoneManager(OzoneConfiguration conf) throws IOException,
       AuthenticationException {
     super(OzoneVersionInfo.OZONE_VERSION_INFO);
@@ -412,6 +415,10 @@ private OzoneManager(OzoneConfiguration conf) throws IOException,
 
     metrics = OMMetrics.create();
 
+    omClientProtocolMetrics = ProtocolMessageMetrics
+        .create("OmClientProtocol", "Ozone Manager RPC endpoint",
+            OzoneManagerProtocolProtos.Type.values());
+
     // Start Om Rpc Server.
     omRpcServer = getRpcServer(conf);
     omRpcAddress = updateRPCListenAddress(configuration,
@@ -984,10 +991,11 @@ private static StorageContainerLocationProtocol getScmContainerClient(
     StorageContainerLocationProtocol scmContainerClient =
         TracingUtil.createProxy(
             new StorageContainerLocationProtocolClientSideTranslatorPB(
-            RPC.getProxy(StorageContainerLocationProtocolPB.class, scmVersion,
+                RPC.getProxy(StorageContainerLocationProtocolPB.class,
-                scmAddr, UserGroupInformation.getCurrentUser(), conf,
+                    scmVersion,
-                NetUtils.getDefaultSocketFactory(conf),
+                    scmAddr, UserGroupInformation.getCurrentUser(), conf,
-                Client.getRpcTimeout(conf))),
+                    NetUtils.getDefaultSocketFactory(conf),
+                    Client.getRpcTimeout(conf))),
             StorageContainerLocationProtocol.class, conf);
     return scmContainerClient;
   }
@@ -1253,6 +1261,8 @@ public OMMetrics getMetrics() {
    */
   public void start() throws IOException {
 
+    omClientProtocolMetrics.register();
+
     LOG.info(buildRpcServerStartMessage("OzoneManager RPC server",
         omRpcAddress));
 
@@ -1377,7 +1387,7 @@ private RPC.Server getRpcServer(OzoneConfiguration conf) throws IOException {
     RPC.setProtocolEngine(configuration, OzoneManagerProtocolPB.class,
         ProtobufRpcEngine.class);
     this.omServerProtocol = new OzoneManagerProtocolServerSideTranslatorPB(
-        this, omRatisServer, isRatisEnabled);
+        this, omRatisServer, omClientProtocolMetrics, isRatisEnabled);
 
     BlockingService omService = newReflectiveBlockingService(omServerProtocol);
 
@@ -1471,6 +1481,7 @@ public void stop() {
       }
       metadataManager.stop();
       metrics.unRegister();
+      omClientProtocolMetrics.unregister();
       unregisterMXBean();
       if (jvmPauseMonitor != null) {
         jvmPauseMonitor.stop();

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/protocolPB/OzoneManagerProtocolServerSideTranslatorPB.java

@@ -16,7 +16,6 @@
  */
 package org.apache.hadoop.ozone.protocolPB;
 
-
 import org.apache.hadoop.hdds.tracing.TracingUtil;
 import org.apache.hadoop.ozone.OmUtils;
 import org.apache.hadoop.ozone.om.OzoneManager;
@@ -54,6 +53,7 @@ public class OzoneManagerProtocolServerSideTranslatorPB implements
   private final boolean isRatisEnabled;
   private final OzoneManager ozoneManager;
   private final OzoneManagerDoubleBuffer ozoneManagerDoubleBuffer;
+  private final ProtocolMessageMetrics protocolMessageMetrics;
 
   /**
    * Constructs an instance of the server handler.
@@ -61,12 +61,15 @@ public class OzoneManagerProtocolServerSideTranslatorPB implements
    * @param impl OzoneManagerProtocolPB
    */
   public OzoneManagerProtocolServerSideTranslatorPB(
-      OzoneManager impl, OzoneManagerRatisServer ratisServer,
+      OzoneManager impl,
+      OzoneManagerRatisServer ratisServer,
+      ProtocolMessageMetrics metrics,
       boolean enableRatis) {
     this.ozoneManager = impl;
     handler = new OzoneManagerRequestHandler(impl);
     this.omRatisServer = ratisServer;
     this.isRatisEnabled = enableRatis;
+    this.protocolMessageMetrics = metrics;
     this.ozoneManagerDoubleBuffer =
         new OzoneManagerDoubleBuffer(ozoneManager.getMetadataManager(), (i) -> {
           // Do nothing.
@@ -82,48 +85,77 @@ public OzoneManagerProtocolServerSideTranslatorPB(
    * translator for OM protocol.
    */
   @Override
-   public OMResponse submitRequest(RpcController controller,
+  public OMResponse submitRequest(RpcController controller,
       OMRequest request) throws ServiceException {
     Scope scope = TracingUtil
         .importAndCreateScope(request.getCmdType().name(),
             request.getTraceID());
     try {
-      if (isRatisEnabled) {
+      if (LOG.isTraceEnabled()) {
-        // Check if the request is a read only request
+        LOG.trace(
-        if (OmUtils.isReadOnly(request)) {
+            "OzoneManagerProtocol {} request is received: <json>{}</json>",
-          return submitReadRequestToOM(request);
+            request.getCmdType().toString(),
-        } else {
+            request.toString().replaceAll("\n", "\\\\n"));
-          if (omRatisServer.isLeader()) {
+      } else if (LOG.isDebugEnabled()) {
-            try {
+        LOG.debug("OzoneManagerProtocol {} request is received",
-              OMClientRequest omClientRequest =
+            request.getCmdType().toString());
-                  OzoneManagerRatisUtils.createClientRequest(request);
-              if (omClientRequest != null) {
-                request = omClientRequest.preExecute(ozoneManager);
-              }
-            } catch(IOException ex) {
-              // As some of the preExecute returns error. So handle here.
-              return createErrorResponse(request, ex);
-            }
-            return submitRequestToRatis(request);
-          } else {
-            // throw not leader exception. This is being done, so to avoid
-            // unnecessary execution of preExecute on follower OM's. This
-            // will be helpful in the case like where we we reduce the
-            // chance of allocate blocks on follower OM's. Right now our
-            // leader status is updated every 1 second.
-            throw createNotLeaderException();
-          }
-        }
-      } else {
-        return submitRequestDirectlyToOM(request);
       }
+      protocolMessageMetrics.increment(request.getCmdType());
+
+      OMResponse omResponse = processRequest(request);
+
+      if (LOG.isTraceEnabled()) {
+        LOG.trace(
+            "OzoneManagerProtocol {} request is processed. Response: "
+                + "<json>{}</json>",
+            request.getCmdType().toString(),
+            omResponse.toString().replaceAll("\n", "\\\\n"));
+      }
+      return omResponse;
+
     } finally {
       scope.close();
     }
   }
 
+  private OMResponse processRequest(OMRequest request) throws
+      ServiceException {
+
+    if (isRatisEnabled) {
+      // Check if the request is a read only request
+      if (OmUtils.isReadOnly(request)) {
+        return submitReadRequestToOM(request);
+      } else {
+        if (omRatisServer.isLeader()) {
+          try {
+            OMClientRequest omClientRequest =
+                OzoneManagerRatisUtils.createClientRequest(request);
+            if (omClientRequest != null) {
+              request = omClientRequest.preExecute(ozoneManager);
+            }
+          } catch (IOException ex) {
+            // As some of the preExecute returns error. So handle here.
+            return createErrorResponse(request, ex);
+          }
+          return submitRequestToRatis(request);
+        } else {
+          // throw not leader exception. This is being done, so to avoid
+          // unnecessary execution of preExecute on follower OM's. This
+          // will be helpful in the case like where we we reduce the
+          // chance of allocate blocks on follower OM's. Right now our
+          // leader status is updated every 1 second.
+          throw createNotLeaderException();
+        }
+      }
+    } else {
+      return submitRequestDirectlyToOM(request);
+    }
+
+  }
+
   /**
    * Create OMResponse from the specified OMRequest and exception.
+   *
    * @param omRequest
    * @param exception
    * @return OMResponse
@@ -153,6 +185,7 @@ private OMResponse createErrorResponse(
       return null;
     }
   }
+
   /**
    * Submits request to OM's Ratis server.
    */

hadoop-ozone/pom.xml

@@ -54,6 +54,7 @@
     <module>upgrade</module>
     <module>csi</module>
     <module>fault-injection-test</module>
+    <module>insight</module>
   </modules>
 
   <repositories>
@@ -168,6 +169,11 @@
         <artifactId>hadoop-hdds-tools</artifactId>
         <version>${hdds.version}</version>
       </dependency>
+      <dependency>
+        <groupId>org.apache.hadoop</groupId>
+        <artifactId>hadoop-ozone-insight</artifactId>
+        <version>${hdds.version}</version>
+      </dependency>
       <dependency>
         <groupId>org.apache.hadoop</groupId>
         <artifactId>hadoop-ozone-recon</artifactId>