샘플 토픽명으로 변경 (sample. 접두사 추가)

- 다른 서비스 개발자들의 운영 토픽과 충돌 방지
- MVP용 샘플 토픽: sample.event.created, sample.participant.registered, sample.distribution.completed
- KafkaTopicConfig, SampleDataLoader, 3개 Consumer 모두 업데이트

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

analytics-service/src/main/java/com/kt/event/analytics/config/KafkaTopicConfig.java

@@ -0,0 +1,53 @@
+package com.kt.event.analytics.config;
+
+import org.apache.kafka.clients.admin.NewTopic;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.config.TopicBuilder;
+
+/**
+ * Kafka 토픽 자동 생성 설정
+ *
+ * ⚠️ MVP 전용: 샘플 데이터용 토픽을 생성합니다.
+ *             실제 운영 토픽(event.created 등)과 구분하기 위해 "sample." 접두사 사용
+ *
+ * 서비스 시작 시 필요한 Kafka 토픽을 자동으로 생성합니다.
+ */
+@Configuration
+@ConditionalOnProperty(name = "spring.kafka.enabled", havingValue = "true", matchIfMissing = false)
+public class KafkaTopicConfig {
+
+    /**
+     * sample.event.created 토픽 (MVP 샘플 데이터용)
+     */
+    @Bean
+    public NewTopic eventCreatedTopic() {
+        return TopicBuilder.name("sample.event.created")
+            .partitions(3)
+            .replicas(1)
+            .build();
+    }
+
+    /**
+     * sample.participant.registered 토픽 (MVP 샘플 데이터용)
+     */
+    @Bean
+    public NewTopic participantRegisteredTopic() {
+        return TopicBuilder.name("sample.participant.registered")
+            .partitions(3)
+            .replicas(1)
+            .build();
+    }
+
+    /**
+     * sample.distribution.completed 토픽 (MVP 샘플 데이터용)
+     */
+    @Bean
+    public NewTopic distributionCompletedTopic() {
+        return TopicBuilder.name("sample.distribution.completed")
+            .partitions(3)
+            .replicas(1)
+            .build();
+    }
+}

analytics-service/src/main/java/com/kt/event/analytics/config/SampleDataLoader.java

@@ -52,10 +52,10 @@ public class SampleDataLoader implements ApplicationRunner {
 
     private final Random random = new Random();
 
-    // Kafka Topic Names
-    private static final String EVENT_CREATED_TOPIC = "event.created";
-    private static final String PARTICIPANT_REGISTERED_TOPIC = "participant.registered";
-    private static final String DISTRIBUTION_COMPLETED_TOPIC = "distribution.completed";
+    // Kafka Topic Names (MVP용 샘플 토픽)
+    private static final String EVENT_CREATED_TOPIC = "sample.event.created";
+    private static final String PARTICIPANT_REGISTERED_TOPIC = "sample.participant.registered";
+    private static final String DISTRIBUTION_COMPLETED_TOPIC = "sample.distribution.completed";
 
     @Override
     @Transactional

analytics-service/src/main/java/com/kt/event/analytics/messaging/consumer/DistributionCompletedConsumer.java

@@ -33,9 +33,9 @@ public class DistributionCompletedConsumer {
     private static final long IDEMPOTENCY_TTL_DAYS = 7;
 
     /**
-     * DistributionCompleted 이벤트 처리
+     * DistributionCompleted 이벤트 처리 (MVP용 샘플 토픽)
      */
-    @KafkaListener(topics = "distribution.completed", groupId = "analytics-service")
+    @KafkaListener(topics = "sample.distribution.completed", groupId = "analytics-service")
     public void handleDistributionCompleted(String message) {
         try {
             log.info("📩 DistributionCompleted 이벤트 수신: {}", message);

analytics-service/src/main/java/com/kt/event/analytics/messaging/consumer/EventCreatedConsumer.java

@@ -33,9 +33,9 @@ public class EventCreatedConsumer {
     private static final long IDEMPOTENCY_TTL_DAYS = 7;
 
     /**
-     * EventCreated 이벤트 처리
+     * EventCreated 이벤트 처리 (MVP용 샘플 토픽)
      */
-    @KafkaListener(topics = "event.created", groupId = "analytics-service")
+    @KafkaListener(topics = "sample.event.created", groupId = "analytics-service")
     public void handleEventCreated(String message) {
         try {
             log.info("📩 EventCreated 이벤트 수신: {}", message);

analytics-service/src/main/java/com/kt/event/analytics/messaging/consumer/ParticipantRegisteredConsumer.java

@@ -33,9 +33,9 @@ public class ParticipantRegisteredConsumer {
     private static final long IDEMPOTENCY_TTL_DAYS = 7;
 
     /**
-     * ParticipantRegistered 이벤트 처리
+     * ParticipantRegistered 이벤트 처리 (MVP용 샘플 토픽)
      */
-    @KafkaListener(topics = "participant.registered", groupId = "analytics-service")
+    @KafkaListener(topics = "sample.participant.registered", groupId = "analytics-service")
     public void handleParticipantRegistered(String message) {
         try {
             log.info("📩 ParticipantRegistered 이벤트 수신: {}", message);

analytics-service/src/main/resources/application.yml

@@ -51,6 +51,11 @@ spring:
       enable-auto-commit: true
       key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
       value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+    producer:
+      key-serializer: org.apache.kafka.common.serialization.StringSerializer
+      value-serializer: org.apache.kafka.common.serialization.StringSerializer
+      acks: all
+      retries: 3
     properties:
       connections.max.idle.ms: 10000
       request.timeout.ms: 5000