[fix] kafka消息最大调整为4M

haobang-security-dm/syslog-serve/src/main/java/com/kafka/kafkaProducer.java

@@ -53,6 +53,7 @@ public class kafkaProducer {
                          @Value("${spring.kafka.producer.compression-type:lz4}") String compressionType,
                          @Value("${spring.kafka.producer.properties.max.block.ms:10000}") int maxBlockMs,
                          @Value("${spring.kafka.producer.properties.buffer.memory:134217728}") long bufferMemory,
+                         @Value("${spring.kafka.producer.properties.max.request.size:4194304}") int maxRequestSize,
                          @Value("${syslog.kafka.partition-key-strategy:event_id}") String partitionKeyStrategy) {
         this.appProperties = appProperties;
         this.partitionKeyStrategy = PartitionKeyStrategy.parse(partitionKeyStrategy);
@@ -73,12 +74,20 @@ public class kafkaProducer {
         // Dispatcher 已限制全局在途数；Producer 缓冲耗尽时快速返回失败，让事件留在 WAL 重试。
         props.put(ProducerConfig.MAX_BLOCK_MS_CONFIG, maxBlockMs);
         props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, bufferMemory);
+        applyMaxRequestSize(props, maxRequestSize);
         // [SYSLOG-ALARM][KPROD][已修复] linger、batch 与压缩恢复跨消息批量能力，吞吐优化不改变 Broker ACK 边界。
         // [SYSLOG-ALARM][KPROD][已修复] Producer 只在应用启动时构造一次，单条热路径不再创建网络线程和连接。
         this.producer = new KafkaProducer<>(props);
         log.info("Kafka Producer 已启用分区策略: strategy={}", this.partitionKeyStrategy.configValue);
     }
 
+    static void applyMaxRequestSize(Properties props, int maxRequestSize) {
+        if (maxRequestSize <= 0) {
+            throw new IllegalArgumentException("spring.kafka.producer.properties.max.request.size 必须大于 0");
+        }
+        props.put(ProducerConfig.MAX_REQUEST_SIZE_CONFIG, maxRequestSize);
+    }
+
     /** 测试入口：复用真实的分区键选择和 ProducerRecord 构造逻辑，不建立 Kafka 网络连接。 */
     kafkaProducer(AppProperties appProperties, Producer<String, String> producer, String partitionKeyStrategy) {
         this.appProperties = appProperties;