DaveTeng0 commented on code in PR #3614:
URL: https://github.com/apache/ozone/pull/3614#discussion_r937107205


##########
hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/OmRPCLoadGenerator.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.freon;
+
+import com.codahale.metrics.Timer;
+import org.apache.commons.lang3.RandomUtils;
+import org.apache.hadoop.hdds.cli.HddsVersionProvider;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import 
org.apache.hadoop.ozone.om.protocolPB.OzoneManagerProtocolClientSideTranslatorPB;
+import 
org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos.EchoRPCResponse;
+import java.util.concurrent.Callable;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Option;
+
+/**
+ * Utility to generate RPC request to OM with or without payload.
+ */
+@Command(name = "om-rpc-load",
+        aliases = "rpcl",
+        description =
+                "Generate echo RPC request to the OM " +
+                        "with or without layload. " +
+                        "Max payload size is 2097151 KB",
+        versionProvider = HddsVersionProvider.class,
+        mixinStandardHelpOptions = true,
+        showDefaultValues = true)
+public class OmRPCLoadGenerator extends BaseFreonGenerator
+        implements Callable<Void> {
+
+  private static final int RPC_PAYLOAD_MULTIPLICATION_FACTOR = 1024;
+  private static final int MAX_SIZE_KB = 2097151;
+  private Timer timer;
+  private OzoneConfiguration configuration;
+  private OzoneManagerProtocolClientSideTranslatorPB client;
+  private byte[] payloadReq;
+  private int payloadRespSize;
+  @Option(names = {"-plrq", "--payload-req"},
+          description =
+                  "Specifies the size of payload in KB in RPC request. " +
+                          "Max size is 2097151 KB",
+          defaultValue = "0")
+  private int payloadReqSizeKB = 0;
+
+  @Option(names = {"-plrp", "--payload-resp"},
+          description =
+                  "Specifies the size of payload in KB in RPC response. " +
+                          "Max size is 2097151 KB",
+          defaultValue = "0")
+  private int payloadRespSizeKB = 0;
+  @Override
+  public Void call() throws Exception {
+    if (payloadReqSizeKB < 0 || payloadRespSizeKB < 0) {
+      throw new IllegalArgumentException(
+              "RPC request or response payload can't be negative value."
+      );
+    }
+
+    configuration = createOzoneConfiguration();
+    client = createOmClient(configuration, null);
+    init();
+    if (payloadReqSizeKB > 0) {
+      //To avoid integer overflow, we cap the payload by max 2048000 KB
+      int payloadReqSize = Math.min(
+              Math.toIntExact(payloadReqSizeKB *
+                      RPC_PAYLOAD_MULTIPLICATION_FACTOR),
+              MAX_SIZE_KB);
+      payloadReq = RandomUtils.nextBytes(payloadReqSize);
+    }
+    if (payloadRespSizeKB > 0) {
+      //To avoid integer overflow, we cap the payload by max 2048000 KB
+      payloadRespSize = Math.min(
+              Math.toIntExact(payloadRespSizeKB *
+                      RPC_PAYLOAD_MULTIPLICATION_FACTOR),
+              MAX_SIZE_KB);
+    }
+    timer = getMetrics().timer("rpc-payload");
+    try {
+      for (int i = 0; i < getThreadNo(); i++) {
+        runTests(this::sendRPCReq);
+      }
+      printReport();

Review Comment:
   oh got it!! thanks!!



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