feat(shipdetail): 선박제원정보 배치 작업 병렬화 (Partitioned Step)

- IMO 목록을 N개 파티션으로 분할하여 병렬 API 호출
- ImoFetchTasklet으로 IMO 조회 단계 분리
- sourceStepExecutionId → sourceJobExecutionId 마이그레이션
- afterFetch 중복 실행 방지 플래그 추가
- partition-count 설정 외부화 (dev:2, prod:4)

src/main/java/com/snp/batch/common/batch/listener/AutoRetryJobExecutionListener.java

@@ -30,7 +30,7 @@ import java.util.Set;
 public class AutoRetryJobExecutionListener implements JobExecutionListener {
 
     private static final String FAILED_RECORD_KEYS = "failedRecordKeys";
-    private static final String FAILED_STEP_EXECUTION_ID = "failedStepExecutionId";
+    private static final String FAILED_JOB_EXECUTION_ID = "failedJobExecutionId";
     private static final String FAILED_API_KEY = "failedApiKey";
     private static final int MAX_AUTO_RETRY_COUNT = 3;
 
@@ -61,7 +61,7 @@ public class AutoRetryJobExecutionListener implements JobExecutionListener {
 
         // 모든 Step의 failedRecordKeys를 Set으로 병합 (중복 제거)
         Set<String> mergedKeys = new LinkedHashSet<>();
-        Long sourceStepExecutionId = null;
+        Long sourceJobExecutionId = jobExecution.getId();
         String apiKey = null;
 
         for (StepExecution stepExecution : jobExecution.getStepExecutions()) {
@@ -77,12 +77,6 @@ public class AutoRetryJobExecutionListener implements JobExecutionListener {
                     .filter(key -> !key.isBlank())
                     .forEach(mergedKeys::add);
 
-            // sourceStepExecutionId: 마지막 Step 것 사용
-            sourceStepExecutionId = stepExecution.getExecutionContext()
-                    .containsKey(FAILED_STEP_EXECUTION_ID)
-                    ? stepExecution.getExecutionContext().getLong(FAILED_STEP_EXECUTION_ID)
-                    : stepExecution.getId();
-
             // apiKey: non-null인 것 중 첫 번째 사용
             if (apiKey == null) {
                 apiKey = stepExecution.getExecutionContext()
@@ -112,8 +106,8 @@ public class AutoRetryJobExecutionListener implements JobExecutionListener {
         log.info("[AutoRetry] {} Job 완료 후 실패 건 {}건 감지 → 자동 재수집 트리거",
                 jobName, mergedKeys.size());
 
-        // sourceStepExecutionId 기반으로 1회만 triggerRetryAsync 호출 (실패 키는 DB에서 직접 조회)
+        // sourceJobExecutionId 기반으로 1회만 triggerRetryAsync 호출 (실패 키는 DB에서 직접 조회)
         autoRetryTriggerService.triggerRetryAsync(
-                jobName, mergedKeys.size(), sourceStepExecutionId, apiKey);
+                jobName, mergedKeys.size(), sourceJobExecutionId, apiKey);
     }
 }

src/main/java/com/snp/batch/common/batch/listener/AutoRetryTriggerService.java

@@ -31,7 +31,7 @@ public class AutoRetryTriggerService {
 
     @Async("autoRetryExecutor")
     public void triggerRetryAsync(String jobName, int failedCount,
-                                  Long sourceStepExecutionId, String apiKey) {
+                                  Long sourceJobExecutionId, String apiKey) {
         try {
             Job job = jobMap.get(jobName);
             if (job == null) {
@@ -41,7 +41,7 @@ public class AutoRetryTriggerService {
 
             JobParametersBuilder builder = new JobParametersBuilder()
                     .addLong("timestamp", System.currentTimeMillis())
-                    .addString("sourceStepExecutionId", String.valueOf(sourceStepExecutionId))
+                    .addString("sourceJobExecutionId", String.valueOf(sourceJobExecutionId))
                     .addString("executionMode", "RECOLLECT")
                     .addString("reason", "자동 재수집 (실패 건 자동 처리)")
                     .addString("executor", "AUTO_RETRY");
@@ -52,8 +52,8 @@ public class AutoRetryTriggerService {
 
             JobParameters retryParams = builder.toJobParameters();
 
-            log.info("[AutoRetry] 재수집 Job 실행 시작: jobName={}, 실패건={}, sourceStepExecutionId={}",
-                    jobName, failedCount, sourceStepExecutionId);
+            log.info("[AutoRetry] 재수집 Job 실행 시작: jobName={}, 실패건={}, sourceJobExecutionId={}",
+                    jobName, failedCount, sourceJobExecutionId);
 
             JobExecution retryExecution = jobLauncher.run(job, retryParams);
 

src/main/java/com/snp/batch/global/config/AsyncConfig.java

@@ -5,6 +5,8 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.scheduling.annotation.EnableAsync;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 
+import org.springframework.core.task.TaskExecutor;
+
 import java.util.concurrent.Executor;
 
 @Configuration
@@ -36,4 +38,19 @@ public class AsyncConfig {
         executor.initialize();
         return executor;
     }
+
+    /**
+     * 배치 파티션 병렬 실행 전용 Executor.
+     * ShipDetailUpdate 파티셔닝 등 배치 Step 병렬 처리에 사용.
+     */
+    @Bean(name = "batchPartitionExecutor")
+    public TaskExecutor batchPartitionExecutor() {
+        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
+        executor.setCorePoolSize(4);        // 기본 파티션 수
+        executor.setMaxPoolSize(8);         // 최대 파티션 수
+        executor.setQueueCapacity(20);      // 대기 큐
+        executor.setThreadNamePrefix("BatchPartition-");
+        executor.initialize();
+        return executor;
+    }
 }

src/main/java/com/snp/batch/global/repository/BatchFailedRecordRepository.java

@@ -59,6 +59,19 @@ public interface BatchFailedRecordRepository extends JpaRepository<BatchFailedRe
             @Param("recordKeys") List<String> recordKeys,
             @Param("resolvedAt") LocalDateTime resolvedAt);
 
+    /**
+     * 특정 Job 실행의 실패 레코드를 RESOLVED로 벌크 업데이트
+     */
+    @Modifying
+    @Query("UPDATE BatchFailedRecord r SET r.status = 'RESOLVED', r.resolvedAt = :resolvedAt " +
+           "WHERE r.jobName = :jobName AND r.jobExecutionId = :jobExecutionId " +
+           "AND r.recordKey IN :recordKeys AND r.status = 'FAILED'")
+    int resolveByJobExecutionIdAndRecordKeys(
+            @Param("jobName") String jobName,
+            @Param("jobExecutionId") Long jobExecutionId,
+            @Param("recordKeys") List<String> recordKeys,
+            @Param("resolvedAt") LocalDateTime resolvedAt);
+
     /**
      * ID 목록으로 FAILED 상태 레코드를 일괄 RESOLVED 처리
      */
@@ -89,6 +102,17 @@ public interface BatchFailedRecordRepository extends JpaRepository<BatchFailedRe
             @Param("jobName") String jobName,
             @Param("stepExecutionId") Long stepExecutionId);
 
+    /**
+     * 특정 Job 실행의 미해결(FAILED) 실패 레코드 키 목록 조회.
+     * 자동 재수집 시 JobParameter 대신 DB에서 직접 조회하여 VARCHAR(2500) 제한을 우회.
+     */
+    @Query("SELECT r.recordKey FROM BatchFailedRecord r " +
+           "WHERE r.jobName = :jobName AND r.jobExecutionId = :jobExecutionId " +
+           "AND r.status = 'FAILED'")
+    List<String> findFailedRecordKeysByJobExecutionId(
+            @Param("jobName") String jobName,
+            @Param("jobExecutionId") Long jobExecutionId);
+
     /**
      * 동일 Job에서 이미 FAILED 상태인 recordKey 목록 조회 (중복 방지용)
      */

src/main/java/com/snp/batch/jobs/shipdetail/batch/config/ShipDetailImoFetchTasklet.java

@@ -0,0 +1,172 @@
+package com.snp.batch.jobs.shipdetail.batch.config;
+
+import com.snp.batch.global.model.BatchApiLog;
+import com.snp.batch.global.repository.BatchFailedRecordRepository;
+import com.snp.batch.jobs.shipdetail.batch.dto.ShipDto;
+import com.snp.batch.jobs.shipdetail.batch.dto.ShipUpdateApiResponse;
+import com.snp.batch.service.BatchApiLogService;
+import com.snp.batch.service.BatchDateService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.batch.core.JobExecution;
+import org.springframework.batch.core.StepContribution;
+import org.springframework.batch.core.scope.context.ChunkContext;
+import org.springframework.batch.core.step.tasklet.Tasklet;
+import org.springframework.batch.repeat.RepeatStatus;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import java.time.LocalDateTime;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+/**
+ * 선박제원정보 변경 IMO 목록 조회 Tasklet.
+ * NORMAL 모드: Maritime API에서 변경된 IMO 번호 조회
+ * RECOLLECT 모드: DB에서 실패 IMO 번호 조회
+ * 조회 결과를 JobExecutionContext에 저장하여 Partitioner가 사용할 수 있게 함.
+ */
+@Slf4j
+public class ShipDetailImoFetchTasklet implements Tasklet {
+
+    private static final String API_KEY = "SHIP_DETAIL_UPDATE_API";
+    private static final String SHIP_UPDATE_API_PATH = "/MaritimeWCF/APSShipService.svc/RESTFul/GetShipChangesByLastUpdateDateRange";
+    private static final String JOB_NAME = "ShipDetailUpdateJob";
+
+    private final WebClient maritimeApiWebClient;
+    private final BatchDateService batchDateService;
+    private final BatchApiLogService batchApiLogService;
+    private final BatchFailedRecordRepository batchFailedRecordRepository;
+    private final String maritimeApiUrl;
+
+    public ShipDetailImoFetchTasklet(
+            WebClient maritimeApiWebClient,
+            BatchDateService batchDateService,
+            BatchApiLogService batchApiLogService,
+            BatchFailedRecordRepository batchFailedRecordRepository,
+            String maritimeApiUrl) {
+        this.maritimeApiWebClient = maritimeApiWebClient;
+        this.batchDateService = batchDateService;
+        this.batchApiLogService = batchApiLogService;
+        this.batchFailedRecordRepository = batchFailedRecordRepository;
+        this.maritimeApiUrl = maritimeApiUrl;
+    }
+
+    @Override
+    public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
+        JobExecution jobExecution = chunkContext.getStepContext()
+                .getStepExecution().getJobExecution();
+        String executionMode = jobExecution.getJobParameters()
+                .getString("executionMode", "NORMAL");
+
+        List<String> imoNumbers;
+
+        if ("RECOLLECT".equals(executionMode)) {
+            imoNumbers = fetchRecollectImoNumbers(jobExecution);
+        } else {
+            imoNumbers = fetchChangedImoNumbers(jobExecution);
+        }
+
+        // JobExecutionContext에 저장
+        jobExecution.getExecutionContext().putInt("totalImoCount", imoNumbers.size());
+
+        if (!imoNumbers.isEmpty()) {
+            jobExecution.getExecutionContext().putString("allImoNumbers", String.join(",", imoNumbers));
+        }
+
+        log.info("[ShipDetailImoFetchTasklet] {} 모드: IMO {} 건 조회 완료",
+                executionMode, imoNumbers.size());
+
+        return RepeatStatus.FINISHED;
+    }
+
+    private List<String> fetchRecollectImoNumbers(JobExecution jobExecution) {
+        String sourceJobExecutionIdParam = jobExecution.getJobParameters()
+                .getString("sourceJobExecutionId");
+
+        if (sourceJobExecutionIdParam == null || sourceJobExecutionIdParam.isBlank()) {
+            log.warn("[ShipDetailImoFetchTasklet] RECOLLECT 모드이나 sourceJobExecutionId가 없음");
+            return Collections.emptyList();
+        }
+
+        Long sourceJobExecutionId = Long.parseLong(sourceJobExecutionIdParam);
+        List<String> retryKeys = batchFailedRecordRepository.findFailedRecordKeysByJobExecutionId(
+                JOB_NAME, sourceJobExecutionId);
+
+        log.info("[ShipDetailImoFetchTasklet] RECOLLECT: DB에서 {} 건의 실패 키 조회 (sourceJobExecutionId: {})",
+                retryKeys.size(), sourceJobExecutionId);
+
+        return retryKeys;
+    }
+
+    private List<String> fetchChangedImoNumbers(JobExecution jobExecution) {
+        Map<String, String> params = batchDateService.getDateRangeWithoutTimeParams(API_KEY);
+
+        MultiValueMap<String, String> multiValueParams = new LinkedMultiValueMap<>();
+        params.forEach((key, value) ->
+                multiValueParams.put(key, Collections.singletonList(value)));
+
+        String fullUri = UriComponentsBuilder.fromHttpUrl(maritimeApiUrl)
+                .path(SHIP_UPDATE_API_PATH)
+                .queryParams(multiValueParams)
+                .build()
+                .toUriString();
+
+        long startTime = System.currentTimeMillis();
+        int statusCode = 200;
+        String errorMessage = null;
+        Long responseSize = 0L;
+
+        try {
+            log.info("[ShipDetailImoFetchTasklet] 변경 IMO 조회 API 호출: {}", fullUri);
+
+            ShipUpdateApiResponse response = maritimeApiWebClient.get()
+                    .uri(uriBuilder -> {
+                        uriBuilder.path(SHIP_UPDATE_API_PATH);
+                        params.forEach(uriBuilder::queryParam);
+                        return uriBuilder.build();
+                    })
+                    .retrieve()
+                    .bodyToMono(new ParameterizedTypeReference<ShipUpdateApiResponse>() {})
+                    .block();
+
+            if (response == null || response.getShips() == null) {
+                return Collections.emptyList();
+            }
+
+            List<String> imoNumbers = response.getShips().stream()
+                    .map(ShipDto::getImoNumber)
+                    .filter(Objects::nonNull)
+                    .collect(Collectors.toList());
+
+            responseSize = (long) imoNumbers.size();
+            return imoNumbers;
+
+        } catch (Exception e) {
+            statusCode = 500;
+            errorMessage = e.getMessage();
+            log.error("[ShipDetailImoFetchTasklet] API 호출 실패: {}", e.getMessage(), e);
+            throw e;
+        } finally {
+            long duration = System.currentTimeMillis() - startTime;
+            batchApiLogService.saveLog(BatchApiLog.builder()
+                    .apiRequestLocation("ShipDetailImoFetchTasklet")
+                    .jobExecutionId(jobExecution.getId())
+                    .stepExecutionId(jobExecution.getStepExecutions().stream()
+                            .findFirst().map(se -> se.getId()).orElse(null))
+                    .requestUri(fullUri)
+                    .httpMethod("GET")
+                    .statusCode(statusCode)
+                    .responseTimeMs(duration)
+                    .responseCount(responseSize)
+                    .errorMessage(errorMessage)
+                    .createdAt(LocalDateTime.now())
+                    .build());
+        }
+    }
+}

src/main/java/com/snp/batch/jobs/shipdetail/batch/config/ShipDetailPartitioner.java

@@ -0,0 +1,61 @@
+package com.snp.batch.jobs.shipdetail.batch.config;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.batch.core.partition.support.Partitioner;
+import org.springframework.batch.item.ExecutionContext;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 선박제원정보 IMO 목록을 N개 파티션으로 분할하는 Partitioner.
+ * JobExecutionContext의 allImoNumbers를 읽어 파티션별 ExecutionContext에 할당.
+ */
+@Slf4j
+public class ShipDetailPartitioner implements Partitioner {
+
+    private final List<String> allImoNumbers;
+    private final int partitionCount;
+
+    public ShipDetailPartitioner(List<String> allImoNumbers, int partitionCount) {
+        this.allImoNumbers = allImoNumbers;
+        this.partitionCount = partitionCount;
+    }
+
+    @Override
+    public Map<String, ExecutionContext> partition(int gridSize) {
+        int totalSize = allImoNumbers.size();
+        // 실제 파티션 수: IMO 수가 적으면 파티션 수를 줄임
+        int actualPartitionCount = Math.min(partitionCount, Math.max(1, totalSize));
+
+        Map<String, ExecutionContext> partitions = new LinkedHashMap<>();
+        int partitionSize = (int) Math.ceil((double) totalSize / actualPartitionCount);
+
+        for (int i = 0; i < actualPartitionCount; i++) {
+            int fromIndex = i * partitionSize;
+            int toIndex = Math.min(fromIndex + partitionSize, totalSize);
+
+            if (fromIndex >= totalSize) {
+                break;
+            }
+
+            List<String> partitionImos = allImoNumbers.subList(fromIndex, toIndex);
+            ExecutionContext context = new ExecutionContext();
+            context.putString("partitionImoNumbers", String.join(",", partitionImos));
+            context.putInt("partitionIndex", i);
+            context.putInt("partitionSize", partitionImos.size());
+
+            String partitionKey = "partition" + i;
+            partitions.put(partitionKey, context);
+
+            log.info("[ShipDetailPartitioner] {} : IMO {} 건 (index {}-{})",
+                    partitionKey, partitionImos.size(), fromIndex, toIndex - 1);
+        }
+
+        log.info("[ShipDetailPartitioner] 총 {} 개 파티션 생성 (전체 IMO: {} 건)",
+                partitions.size(), totalSize);
+
+        return partitions;
+    }
+}

src/main/java/com/snp/batch/jobs/shipdetail/batch/config/ShipDetailUpdateJobConfig.java

@@ -2,18 +2,19 @@ package com.snp.batch.jobs.shipdetail.batch.config;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.snp.batch.common.batch.config.BaseMultiStepJobConfig;
-import org.springframework.batch.core.JobExecutionListener;
+import com.snp.batch.global.repository.BatchFailedRecordRepository;
 import com.snp.batch.jobs.shipdetail.batch.dto.ShipDetailDto;
 import com.snp.batch.jobs.shipdetail.batch.entity.ShipDetailEntity;
 import com.snp.batch.jobs.shipdetail.batch.processor.ShipDetailDataProcessor;
 import com.snp.batch.jobs.shipdetail.batch.reader.ShipDetailUpdateDataReader;
 import com.snp.batch.jobs.shipdetail.batch.writer.ShipDetailDataWriter;
-import com.snp.batch.global.repository.BatchFailedRecordRepository;
 import com.snp.batch.service.BatchApiLogService;
 import com.snp.batch.service.BatchDateService;
 import com.snp.batch.service.BatchFailedRecordService;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.batch.core.Job;
+import org.springframework.batch.core.JobExecution;
+import org.springframework.batch.core.JobExecutionListener;
 import org.springframework.batch.core.Step;
 import org.springframework.batch.core.configuration.annotation.StepScope;
 import org.springframework.batch.core.job.builder.JobBuilder;
@@ -22,20 +23,20 @@ import org.springframework.batch.core.job.flow.JobExecutionDecider;
 import org.springframework.batch.core.repository.JobRepository;
 import org.springframework.batch.core.step.builder.StepBuilder;
 import org.springframework.batch.core.step.tasklet.Tasklet;
-import org.springframework.batch.item.ItemProcessor;
-import org.springframework.batch.item.ItemReader;
-import org.springframework.batch.item.ItemWriter;
 import org.springframework.batch.repeat.RepeatStatus;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.task.TaskExecutor;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.transaction.PlatformTransactionManager;
 import org.springframework.web.reactive.function.client.WebClient;
 
 import java.sql.Timestamp;
 import java.time.LocalDateTime;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 @Slf4j
@@ -53,6 +54,7 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
     private final BatchFailedRecordService batchFailedRecordService;
     private final BatchFailedRecordRepository batchFailedRecordRepository;
     private final JobExecutionListener autoRetryJobExecutionListener;
+    private final TaskExecutor batchPartitionExecutor;
 
     @Value("${app.batch.ship-api.url}")
     private String maritimeApiUrl;
@@ -75,8 +77,10 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
     @Value("${app.batch.last-execution-buffer-hours:24}")
     private int lastExecutionBufferHours;
 
-    protected String getApiKey() {return "SHIP_DETAIL_UPDATE_API";}
+    @Value("${app.batch.ship-detail-update.partition-count:4}")
+    private int partitionCount;
 
+    protected String getApiKey() {return "SHIP_DETAIL_UPDATE_API";}
 
     public ShipDetailUpdateJobConfig(
             JobRepository jobRepository,
@@ -91,7 +95,8 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
             BatchApiLogService batchApiLogService,
             BatchFailedRecordService batchFailedRecordService,
             BatchFailedRecordRepository batchFailedRecordRepository,
-            @Qualifier("autoRetryJobExecutionListener") JobExecutionListener autoRetryJobExecutionListener) {
+            @Qualifier("autoRetryJobExecutionListener") JobExecutionListener autoRetryJobExecutionListener,
+            @Qualifier("batchPartitionExecutor") TaskExecutor batchPartitionExecutor) {
         super(jobRepository, transactionManager);
         this.shipDetailDataProcessor = shipDetailDataProcessor;
         this.shipDetailDataWriter = shipDetailDataWriter;
@@ -104,6 +109,7 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
         this.batchFailedRecordService = batchFailedRecordService;
         this.batchFailedRecordRepository = batchFailedRecordRepository;
         this.autoRetryJobExecutionListener = autoRetryJobExecutionListener;
+        this.batchPartitionExecutor = batchPartitionExecutor;
     }
 
     @Override
@@ -121,41 +127,105 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
         return "ShipDetailUpdateStep";
     }
 
+    // ========================================
+    // Job Flow 정의
+    // ========================================
+
     @Override
     protected Job createJobFlow(JobBuilder jobBuilder) {
         return jobBuilder
-                .start(ShipDetailUpdateStep())
-                .next(emptyResponseDecider())
+                .start(shipDetailImoFetchStep())
+                .next(imoCountDecider())
                 .on("EMPTY_RESPONSE").end()
-                .from(emptyResponseDecider()).on("NORMAL").to(shipDetailLastExecutionUpdateStep())
+                .from(imoCountDecider()).on("NORMAL").to(shipDetailUpdatePartitionedStep())
+                .next(shipDetailLastExecutionUpdateStep())
                 .end()
                 .build();
     }
 
-    /**
-     * 응답 데이터 건수 판별 Decider
-     * 응답 0건이면 EMPTY_RESPONSE, 아니면 NORMAL 반환
-     */
+    // ========================================
+    // Step 0: IMO 목록 조회
+    // ========================================
+
     @Bean
-    public JobExecutionDecider emptyResponseDecider() {
+    public Tasklet shipDetailImoFetchTasklet() {
+        return new ShipDetailImoFetchTasklet(
+                maritimeApiWebClient, batchDateService, batchApiLogService,
+                batchFailedRecordRepository, maritimeApiUrl);
+    }
+
+    @Bean(name = "ShipDetailImoFetchStep")
+    public Step shipDetailImoFetchStep() {
+        return new StepBuilder("ShipDetailImoFetchStep", jobRepository)
+                .tasklet(shipDetailImoFetchTasklet(), transactionManager)
+                .build();
+    }
+
+    // ========================================
+    // Decider: IMO 건수 확인
+    // ========================================
+
+    @Bean
+    public JobExecutionDecider imoCountDecider() {
         return (jobExecution, stepExecution) -> {
-            if (stepExecution != null && stepExecution.getReadCount() == 0) {
-                log.info("[ShipDetailUpdateJob] Decider: EMPTY_RESPONSE - 응답 데이터 0건으로 LAST_EXECUTION 업데이트 스킵 (다음 실행 시 동일 범위 재조회)");
+            int totalImoCount = jobExecution.getExecutionContext().getInt("totalImoCount", 0);
+
+            if (totalImoCount == 0) {
+                log.info("[ShipDetailUpdateJob] Decider: EMPTY_RESPONSE - IMO 0건으로 LAST_EXECUTION 업데이트 스킵");
                 return new FlowExecutionStatus("EMPTY_RESPONSE");
             }
 
-            log.info("[ShipDetailUpdateJob] Decider: NORMAL 모드 - LAST_EXECUTION 업데이트 진행");
+            log.info("[ShipDetailUpdateJob] Decider: NORMAL - IMO {} 건 처리 시작", totalImoCount);
             return new FlowExecutionStatus("NORMAL");
         };
     }
 
+    // ========================================
+    // Step 1: Partitioned Step (병렬 처리)
+    // ========================================
+
+    @Bean
+    @StepScope
+    public ShipDetailPartitioner shipDetailPartitioner(
+            @Value("#{jobExecutionContext['allImoNumbers']}") String allImoNumbersStr
+    ) {
+        List<String> allImoNumbers = (allImoNumbersStr != null && !allImoNumbersStr.isBlank())
+                ? Arrays.asList(allImoNumbersStr.split(","))
+                : Collections.emptyList();
+        return new ShipDetailPartitioner(allImoNumbers, partitionCount);
+    }
+
+    @Bean(name = "ShipDetailUpdatePartitionedStep")
+    public Step shipDetailUpdatePartitionedStep() {
+        return new StepBuilder("ShipDetailUpdatePartitionedStep", jobRepository)
+                .partitioner("ShipDetailUpdateStep", shipDetailPartitioner(null))
+                .step(shipDetailUpdateWorkerStep())
+                .taskExecutor(batchPartitionExecutor)
+                .gridSize(partitionCount)
+                .build();
+    }
+
+    @Bean
+    public Step shipDetailUpdateWorkerStep() {
+        return new StepBuilder("ShipDetailUpdateStep", jobRepository)
+                .<ShipDetailDto, ShipDetailEntity>chunk(getChunkSize(), transactionManager)
+                .reader(shipDetailUpdateDataReader(null, null, null, null))
+                .processor(shipDetailDataProcessor(null))
+                .writer(shipDetailDataWriter)
+                .build();
+    }
+
+    // ========================================
+    // Reader / Processor (StepScope)
+    // ========================================
+
     @Bean
     @StepScope
     public ShipDetailUpdateDataReader shipDetailUpdateDataReader(
             @Value("#{stepExecution.jobExecution.id}") Long jobExecutionId,
             @Value("#{stepExecution.id}") Long stepExecutionId,
             @Value("#{jobParameters['executionMode']}") String executionMode,
-            @Value("#{jobParameters['sourceStepExecutionId']}") String sourceStepExecutionIdParam
+            @Value("#{stepExecutionContext['partitionImoNumbers']}") String partitionImoNumbers
     ) {
         ShipDetailUpdateDataReader reader = new ShipDetailUpdateDataReader(
                 maritimeApiWebClient, jdbcTemplate, objectMapper,
@@ -163,36 +233,15 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
                 shipDetailBatchSize, delayOnSuccessMs, delayOnFailureMs, maxRetryCount
         );
         reader.setExecutionIds(jobExecutionId, stepExecutionId);
+        reader.setPartitionImoNumbers(partitionImoNumbers);
 
-        // RECOLLECT 모드: DB에서 실패 키를 직접 조회하여 주입
-        if ("RECOLLECT".equals(executionMode) && sourceStepExecutionIdParam != null && !sourceStepExecutionIdParam.isBlank()) {
-            Long sourceStepExecutionId = Long.parseLong(sourceStepExecutionIdParam);
-            List<String> retryKeys = batchFailedRecordRepository.findFailedRecordKeysByStepExecutionId(
-                    "ShipDetailUpdateJob", sourceStepExecutionId);
-
-            if (!retryKeys.isEmpty()) {
-                reader.setRetryRecordKeys(retryKeys);
-                reader.setSourceStepExecutionId(sourceStepExecutionId);
-                log.info("[ShipDetailUpdateJob] Retry 모드 활성화: DB에서 {} 건의 실패 키 조회, sourceStepExecutionId: {}",
-                        retryKeys.size(), sourceStepExecutionId);
-            } else {
-                log.warn("[ShipDetailUpdateJob] RECOLLECT 모드이나 DB에서 실패 키를 찾을 수 없음 (sourceStepExecutionId: {})",
-                        sourceStepExecutionId);
-            }
+        if ("RECOLLECT".equals(executionMode)) {
+            reader.setRecollectMode(true);
         }
 
         return reader;
     }
 
-    @Override
-    protected ItemReader<ShipDetailDto> createReader() { // 타입 변경
-        return shipDetailUpdateDataReader;
-    }
-
-    @Override
-    protected ItemProcessor<ShipDetailDto, ShipDetailEntity> createProcessor() {
-        return shipDetailDataProcessor;
-    }
     @Bean
     @StepScope
     public ShipDetailDataProcessor shipDetailDataProcessor(
@@ -201,29 +250,24 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
         return new ShipDetailDataProcessor(jobExecutionId);
     }
 
-    @Override
-    protected ItemWriter<ShipDetailEntity> createWriter() { // 타입 변경
-        return shipDetailDataWriter;
-    }
-
     @Override
     protected int getChunkSize() {
         return 20;
     }
 
+    // ========================================
+    // Job / Step Bean 등록
+    // ========================================
+
     @Bean(name = "ShipDetailUpdateJob")
     public Job ShipDetailUpdateJob() {
         return job();
     }
 
-    @Bean(name = "ShipDetailUpdateStep")
-    public Step ShipDetailUpdateStep() {
-        return step();
-    }
+    // ========================================
+    // Step 2: LastExecution 업데이트
+    // ========================================
 
-    /**
-     * 2단계: 모든 스텝 성공 시 배치 실행 로그(날짜) 업데이트
-     */
     @Bean
     public Tasklet shipDetailLastExecutionUpdateTasklet() {
         return (contribution, chunkContext) -> {
@@ -257,6 +301,7 @@ public class ShipDetailUpdateJobConfig extends BaseMultiStepJobConfig<ShipDetail
             return RepeatStatus.FINISHED;
         };
     }
+
     @Bean(name = "ShipDetailLastExecutionUpdateStep")
     public Step shipDetailLastExecutionUpdateStep() {
         return new StepBuilder("ShipDetailLastExecutionUpdateStep", jobRepository)

src/main/java/com/snp/batch/jobs/shipdetail/batch/reader/ShipDetailUpdateDataReader.java

@@ -4,9 +4,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.snp.batch.common.batch.reader.BaseApiReader;
 import com.snp.batch.jobs.shipdetail.batch.dto.ShipDetailApiResponse;
 import com.snp.batch.jobs.shipdetail.batch.dto.ShipDetailDto;
-import com.snp.batch.jobs.shipdetail.batch.dto.ShipDto;
 import com.snp.batch.jobs.shipdetail.batch.dto.ShipResultDto;
-import com.snp.batch.jobs.shipdetail.batch.dto.ShipUpdateApiResponse;
 import com.snp.batch.service.BatchApiLogService;
 import com.snp.batch.service.BatchDateService;
 import com.snp.batch.service.BatchFailedRecordService;
@@ -41,10 +39,11 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
     // 실패 IMO 추적
     private final List<String> failedImoNumbers = new ArrayList<>();
     private String lastErrorMessage;
+    private boolean afterFetchCompleted = false;
 
-    // Retry 모드
-    private List<String> retryRecordKeys;
-    private Long sourceStepExecutionId;
+    // 파티션 모드
+    private String partitionImoNumbers;
+    private boolean recollectMode = false;
 
     public ShipDetailUpdateDataReader(
             WebClient webClient,
@@ -73,16 +72,12 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
         enableChunkMode();
     }
 
-    public void setRetryRecordKeys(List<String> retryRecordKeys) {
-        this.retryRecordKeys = retryRecordKeys;
+    public void setPartitionImoNumbers(String partitionImoNumbers) {
+        this.partitionImoNumbers = partitionImoNumbers;
     }
 
-    public void setSourceStepExecutionId(Long sourceStepExecutionId) {
-        this.sourceStepExecutionId = sourceStepExecutionId;
-    }
-
-    private boolean isRetryMode() {
-        return retryRecordKeys != null && !retryRecordKeys.isEmpty();
+    public void setRecollectMode(boolean recollectMode) {
+        this.recollectMode = recollectMode;
     }
 
     @Override
@@ -90,10 +85,6 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
         return "ShipDetailUpdateDataReader";
     }
 
-    protected String getShipUpdateApiPath() {
-        return "/MaritimeWCF/APSShipService.svc/RESTFul/GetShipChangesByLastUpdateDateRange";
-    }
-
     @Override
     protected String getApiPath() {
         return "/MaritimeWCF/APSShipService.svc/RESTFul/GetShipsByIHSLRorIMONumbersAll";
@@ -109,25 +100,22 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
         this.allImoNumbers = null;
         this.failedImoNumbers.clear();
         this.lastErrorMessage = null;
-        // retryRecordKeys는 JobConfig에서 주입하므로 초기화하지 않음
+        this.afterFetchCompleted = false;
     }
 
     @Override
     protected void beforeFetch() {
-        if (isRetryMode()) {
-            log.info("[{}] [RETRY MODE] 실패 건 재수집 모드 시작 - 대상 IMO: {} 건",
-                    getReaderName(), retryRecordKeys.size());
-            allImoNumbers = new ArrayList<>(retryRecordKeys);
-            log.info("[{}] [RETRY MODE] IMO 목록: {}", getReaderName(), allImoNumbers);
+        // 파티션에서 할당받은 IMO 목록을 파싱
+        if (partitionImoNumbers != null && !partitionImoNumbers.isBlank()) {
+            allImoNumbers = new ArrayList<>(Arrays.asList(partitionImoNumbers.split(",")));
         } else {
-            log.info("[{}] 변경된 IMO 번호 조회 시작...", getReaderName());
-            ShipUpdateApiResponse response = callShipUpdateApi();
-            allImoNumbers = extractUpdateImoNumbers(response);
-            log.info("[{}] 총 {} 개의 변경된 IMO 번호 조회 완료", getReaderName(), allImoNumbers.size());
+            allImoNumbers = Collections.emptyList();
         }
 
         int totalBatches = (int) Math.ceil((double) allImoNumbers.size() / batchSize);
 
+        log.info("[{}] 파티션 IMO {} 건 할당 (recollectMode: {})",
+                getReaderName(), allImoNumbers.size(), recollectMode);
         log.info("[{}] 설정: batch-size={}, delay-success={}ms, delay-failure={}ms, max-retry={}",
                 getReaderName(), batchSize, delayOnSuccessMs, delayOnFailureMs, maxRetryCount);
         log.info("[{}] 예상 배치 수: {} 개", getReaderName(), totalBatches);
@@ -255,46 +243,31 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
         );
     }
 
-    private ShipUpdateApiResponse callShipUpdateApi() {
-        Map<String, String> params = batchDateService.getDateRangeWithoutTimeParams(getApiKey());
-        return executeSingleApiCall(
-                maritimeApiUrl,
-                getShipUpdateApiPath(),
-                params,
-                new ParameterizedTypeReference<ShipUpdateApiResponse>() {},
-                batchApiLogService,
-                res -> res.getShips() != null ? (long) res.getShips().size() : 0L
-        );
-    }
-
-    private List<String> extractUpdateImoNumbers(ShipUpdateApiResponse response) {
-        if (response.getShips() == null) {
-            return Collections.emptyList();
-        }
-        return response.getShips().stream()
-                .map(ShipDto::getImoNumber)
-                .filter(imoNumber -> imoNumber != null)
-                .collect(Collectors.toList());
-    }
-
     @Override
     protected void afterFetch(List<ShipDetailDto> data) {
-        int totalBatches = (int) Math.ceil((double) allImoNumbers.size() / batchSize);
+        int totalBatches = allImoNumbers != null
+                ? (int) Math.ceil((double) allImoNumbers.size() / batchSize) : 0;
         try {
-            if (data == null) {
+            if (data == null && !afterFetchCompleted) {
+                afterFetchCompleted = true;
                 log.info("[{}] 전체 {} 개 배치 처리 완료", getReaderName(), totalBatches);
                 log.info("[{}] 총 {} 개의 IMO 번호에 대한 API 호출 종료",
-                        getReaderName(), allImoNumbers.size());
+                        getReaderName(), allImoNumbers != null ? allImoNumbers.size() : 0);
 
-                if (isRetryMode()) {
-                    // Retry 모드: 성공 건 RESOLVED 처리 + 재실패 건 새 FAILED 레코드 저장
-                    log.info("[{}] [RETRY MODE] 재수집 결과 처리 시작 (sourceStepExecutionId: {})",
-                            getReaderName(), sourceStepExecutionId);
-                    batchFailedRecordService.resolveSuccessfulRetries(
-                            "ShipDetailUpdateJob", sourceStepExecutionId, retryRecordKeys, failedImoNumbers);
+                if (recollectMode) {
+                    // RECOLLECT 모드: 성공 건 RESOLVED 처리 + 재실패 건 새 FAILED 레코드 저장
+                    Long sourceJobExecutionId = getSourceJobExecutionId();
+                    log.info("[{}] [RECOLLECT] 재수집 결과 처리 시작 (sourceJobExecutionId: {})",
+                            getReaderName(), sourceJobExecutionId);
+
+                    if (sourceJobExecutionId != null) {
+                        batchFailedRecordService.resolveSuccessfulRetries(
+                                "ShipDetailUpdateJob", sourceJobExecutionId,
+                                allImoNumbers, failedImoNumbers);
+                    }
 
                     if (!failedImoNumbers.isEmpty()) {
-                        log.warn("[{}] [RETRY MODE] 재실패 IMO 건수: {} 건", getReaderName(), failedImoNumbers.size());
+                        log.warn("[{}] [RECOLLECT] 재실패 IMO 건수: {} 건", getReaderName(), failedImoNumbers.size());
                         batchFailedRecordService.saveFailedRecords(
                                 "ShipDetailUpdateJob",
                                 getJobExecutionId(),
@@ -304,11 +277,11 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
                                 lastErrorMessage
                         );
                     } else {
-                        log.info("[{}] [RETRY MODE] 모든 재수집 건 정상 처리 완료", getReaderName());
+                        log.info("[{}] [RECOLLECT] 모든 재수집 건 정상 처리 완료", getReaderName());
                     }
 
-                    int successCount = retryRecordKeys.size() - failedImoNumbers.size();
-                    log.info("[{}] [RETRY MODE] 결과: 성공 {} 건, 재실패 {} 건",
+                    int successCount = (allImoNumbers != null ? allImoNumbers.size() : 0) - failedImoNumbers.size();
+                    log.info("[{}] [RECOLLECT] 결과: 성공 {} 건, 재실패 {} 건",
                             getReaderName(), successCount, failedImoNumbers.size());
                 } else {
                     // 일반 모드: 동기 저장 (자동 재수집 트리거 전에 커밋 보장)
@@ -333,11 +306,11 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
             log.error("[{}] afterFetch 처리 중 예외 발생: {}", getReaderName(), e.getMessage(), e);
         } finally {
             // 일반 모드에서만: 실패 건이 있으면 ExecutionContext에 저장 (자동 재수집 트리거용)
-            if (!isRetryMode() && !failedImoNumbers.isEmpty() && stepExecution != null) {
+            if (!recollectMode && !failedImoNumbers.isEmpty() && stepExecution != null) {
                 try {
                     String failedKeys = String.join(",", failedImoNumbers);
                     stepExecution.getExecutionContext().putString("failedRecordKeys", failedKeys);
-                    stepExecution.getExecutionContext().putLong("failedStepExecutionId", getStepExecutionId());
+                    stepExecution.getExecutionContext().putLong("failedJobExecutionId", getJobExecutionId());
                     stepExecution.getExecutionContext().putString("failedApiKey", getApiKey());
                     log.info("[{}] 자동 재수집 대상 실패 키 {} 건 ExecutionContext에 저장",
                             getReaderName(), failedImoNumbers.size());
@@ -347,4 +320,18 @@ public class ShipDetailUpdateDataReader extends BaseApiReader<ShipDetailDto> {
             }
         }
     }
+
+    /**
+     * JobParameter에서 sourceJobExecutionId를 조회 (RECOLLECT 모드용)
+     */
+    private Long getSourceJobExecutionId() {
+        if (stepExecution != null) {
+            String param = stepExecution.getJobExecution()
+                    .getJobParameters().getString("sourceJobExecutionId");
+            if (param != null && !param.isBlank()) {
+                return Long.parseLong(param);
+            }
+        }
+        return null;
+    }
 }

src/main/java/com/snp/batch/service/BatchFailedRecordService.java

@@ -141,19 +141,19 @@ public class BatchFailedRecordService {
 
     /**
      * 재수집 성공 건을 RESOLVED로 처리합니다.
-     * 원본 stepExecutionId로 범위를 제한하여 해당 Step의 실패 건만 RESOLVED 처리합니다.
+     * 원본 jobExecutionId로 범위를 제한하여 해당 Job의 실패 건만 RESOLVED 처리합니다.
      */
     @Transactional(propagation = Propagation.REQUIRES_NEW)
-    public void resolveSuccessfulRetries(String jobName, Long sourceStepExecutionId,
+    public void resolveSuccessfulRetries(String jobName, Long sourceJobExecutionId,
                                          List<String> allRetryKeys, List<String> failedAgainKeys) {
         List<String> successfulKeys = allRetryKeys.stream()
                 .filter(key -> !failedAgainKeys.contains(key))
                 .toList();
         if (!successfulKeys.isEmpty()) {
-            int resolved = batchFailedRecordRepository.resolveByStepExecutionIdAndRecordKeys(
-                    jobName, sourceStepExecutionId, successfulKeys, LocalDateTime.now());
-            log.info("실패 레코드 RESOLVED 처리: {} 건 (job: {}, sourceStepExecutionId: {})",
-                    resolved, jobName, sourceStepExecutionId);
+            int resolved = batchFailedRecordRepository.resolveByJobExecutionIdAndRecordKeys(
+                    jobName, sourceJobExecutionId, successfulKeys, LocalDateTime.now());
+            log.info("실패 레코드 RESOLVED 처리: {} 건 (job: {}, sourceJobExecutionId: {})",
+                    resolved, jobName, sourceJobExecutionId);
         }
     }
 }

src/main/resources/application-dev.yml

@@ -110,10 +110,11 @@ app:
 
     # ShipDetailUpdate 배치 설정 (dev - 기존과 동일하게 20건 유지)
     ship-detail-update:
-      batch-size: 20              # dev에서는 문제 없으므로 기존 20건 유지
+      batch-size: 10              # dev에서는 문제 없으므로 기존 20건 유지
       delay-on-success-ms: 300
       delay-on-failure-ms: 2000
       max-retry-count: 3
+      partition-count: 4          # dev: 2개 파티션
 
     # AIS Target 배치 설정
     ais-target:

src/main/resources/application-prod.yml

@@ -115,6 +115,7 @@ app:
       delay-on-success-ms: 300    # 성공 시 딜레이 (ms)
       delay-on-failure-ms: 2000   # 실패 시 딜레이 (ms)
       max-retry-count: 3          # 최대 재시도 횟수
+      partition-count: 4          # prod: 4개 파티션
 
     # AIS Target 배치 설정
     ais-target:

src/main/resources/application.yml

@@ -172,6 +172,7 @@ app:
       delay-on-success-ms: 300    # 성공 시 딜레이 (ms)
       delay-on-failure-ms: 2000   # 실패 시 딜레이 (ms)
       max-retry-count: 3          # 최대 재시도 횟수
+      partition-count: 4          # 병렬 파티션 수
 
     # AIS Target Import 배치 설정 (캐시 업데이트 전용)
     ais-target: