[chore](agent) log the binary message size of agent tasks (apache#43239)

fe/fe-common/src/main/java/org/apache/doris/common/ThriftUtils.java

@@ -0,0 +1,85 @@
+// 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.doris.common;
+
+import org.apache.thrift.TBase;
+import org.apache.thrift.TConfiguration;
+import org.apache.thrift.TException;
+import org.apache.thrift.protocol.TBinaryProtocol;
+import org.apache.thrift.transport.TTransport;
+import org.apache.thrift.transport.TTransportException;
+
+// Utility functions for thrift
+public class ThriftUtils {
+    // Get the size of the binary message of the thrift object
+    public static long getBinaryMessageSize(TBase<?, ?> thriftObject) {
+        TSizeTransport trans = new TSizeTransport();
+        TBinaryProtocol protocol = new TBinaryProtocol(trans);
+        try {
+            thriftObject.write(protocol);
+        } catch (TException e) {
+            return -1;
+        }
+        return trans.getSize();
+    }
+
+    // A transport class that only records the size of the message
+    private static class TSizeTransport extends TTransport {
+        private long size = 0;
+
+        public long getSize() {
+            return size;
+        }
+
+        @Override
+        public void write(byte[] buf, int off, int len) throws TTransportException {
+            size += len;
+        }
+
+        @Override
+        public boolean isOpen() {
+            return true;
+        }
+
+        @Override
+        public void open() throws TTransportException {
+        }
+
+        @Override
+        public void close() {
+        }
+
+        @Override
+        public int read(byte[] buf, int off, int len) throws TTransportException {
+            throw new UnsupportedOperationException("Unimplemented method 'read'");
+        }
+
+        @Override
+        public TConfiguration getConfiguration() {
+            return new TConfiguration();
+        }
+
+        @Override
+        public void updateKnownMessageSize(long size) throws TTransportException {
+        }
+
+        @Override
+        public void checkReadBytesAvailable(long numBytes) throws TTransportException {
+        }
+    }
+}

fe/fe-core/src/main/java/org/apache/doris/task/AgentBatchTask.java

@@ -20,6 +20,7 @@
 import org.apache.doris.catalog.Env;
 import org.apache.doris.common.ClientPool;
 import org.apache.doris.common.FeConstants;
+import org.apache.doris.common.ThriftUtils;
 import org.apache.doris.system.Backend;
 import org.apache.doris.thrift.BackendService;
 import org.apache.doris.thrift.TAgentServiceVersion;
@@ -208,6 +209,14 @@ public void run() {
     private static void submitTasks(long backendId,
             BackendService.Client client, List<TAgentTaskRequest> agentTaskRequests) throws TException {
         if (!agentTaskRequests.isEmpty()) {
+            if (LOG.isDebugEnabled()) {
+                long size = agentTaskRequests.stream()
+                        .map(ThriftUtils::getBinaryMessageSize)
+                        .reduce(0L, Long::sum);
+                TTaskType firstTaskType = agentTaskRequests.get(0).getTaskType();
+                LOG.debug("submit {} tasks to backend[{}], total size: {}, first task type: {}",
+                        agentTaskRequests.size(), backendId, size, firstTaskType);
+            }
             client.submitTasks(agentTaskRequests);
         }
         if (LOG.isDebugEnabled()) {