[GitHub] [ozone] xBis7 commented on a diff in pull request #4044: HDDS-7517. Register OM-S3G gRPC performance metrics

[GitBox <gi...@apache.org>]

xBis7 commented on code in PR #4044:
URL: https://github.com/apache/ozone/pull/4044#discussion_r1065695690


##########
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/grpc/GrpcOmServerRequestInterceptor.java:
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@@ -0,0 +1,113 @@
+/**
+ * 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.om.grpc;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.ozone.om.grpc.metrics.GrpcOzoneManagerMetrics;
+import io.grpc.ForwardingServerCallListener.SimpleForwardingServerCallListener;
+import io.grpc.Metadata;
+import io.grpc.ServerCall;
+import io.grpc.ServerCallHandler;
+import io.grpc.ServerInterceptor;
+
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectOutputStream;
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * Interceptor to gather metrics based on grpc server request.
+ */
+public class GrpcOmServerRequestInterceptor implements ServerInterceptor {
+
+  private final GrpcOzoneManagerMetrics grpcMetrics;
+  private long bytesReceived;
+  private long receivedTime;
+  private long startTime;
+  private long endTime;
+
+  public GrpcOmServerRequestInterceptor(
+      GrpcOzoneManagerMetrics grpcMetrics) {
+    super();
+    this.grpcMetrics = grpcMetrics;
+    this.bytesReceived = 0;
+  }
+
+  @Override
+  public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
+      ServerCall<ReqT, RespT> serverCall, Metadata headers,
+      ServerCallHandler<ReqT, RespT> serverCallHandler) {
+
+    // received time
+    receivedTime = System.nanoTime();
+
+    return new SimpleForwardingServerCallListener<ReqT>(
+        serverCallHandler.startCall(serverCall, headers)) {
+
+      @Override
+      public void onMessage(ReqT message) {
+        // start time
+        startTime = System.nanoTime();
+
+        ByteArrayOutputStream byteArrayOutputStream =
+            new ByteArrayOutputStream();
+        try {
+          ObjectOutputStream outputStream =
+              new ObjectOutputStream(byteArrayOutputStream);
+          outputStream.writeObject(message);

Review Comment:
   @duongkame Thanks for looking into this. As a fall back, I will use the first approach where we are serializing the message because the results are the same with `parsedMessage.getSerializedSize()`. 



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