[fix] kafka消息最大调整为4M

haobang-security-dm/syslog-serve/src/test/java/com/kafka/KafkaProducerEventIdTest.java

@@ -4,10 +4,12 @@ import com.haobang.config.AppProperties;
 import com.common.entity.DeviceDevice;
 import com.haobang.util.DeviceInfoUtil;
 import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.clients.producer.ProducerConfig;
 import org.apache.kafka.clients.producer.ProducerRecord;
 import org.junit.jupiter.api.Test;
 
 import java.time.Instant;
+import java.util.Properties;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -17,6 +19,21 @@ import static org.mockito.Mockito.mock;
 
 class KafkaProducerEventIdTest {
 
+    @Test
+    void maxRequestSizeIsPassedToTheManuallyConstructedKafkaProducer() {
+        Properties properties = new Properties();
+
+        kafkaProducer.applyMaxRequestSize(properties, 4 * 1024 * 1024);
+
+        assertEquals(4 * 1024 * 1024, properties.get(ProducerConfig.MAX_REQUEST_SIZE_CONFIG));
+    }
+
+    @Test
+    void nonPositiveMaxRequestSizeFailsFast() {
+        assertThrows(IllegalArgumentException.class,
+                () -> kafkaProducer.applyMaxRequestSize(new Properties(), 0));
+    }
+
     @Test
     void eventIdDateUsesShanghaiTimeInsteadOfJvmDefaultTimeZone() {
         Instant shanghaiMidnight = Instant.parse("2026-08-10T16:00:00Z");