並行処理テスト

Reference

https://docs.spring.io/spring-batch/docs/current/reference/html/scalability.html(英語)
https://jojoldu.tistory.com/331 chunck指向処理(韓国語)
https://stackoverflow.com/questions/46452527/difference-between-chunk-size-and-page-size-spring-batch

breakdown options

• there are two modes of parallel processing:
  • Single process, multi-threaded
  • Multi-process
• These break down into categories as well, as follows:
  • Multi-threaded Step (single process)
  • Parallel Steps (single process)
  • Remote Chunking of Step (multi process)
  • Partitioning a Step (single or multi process)

ItemReader

※https://jojoldu.tistory.com/331から/問題あれば削除

Chunk Size는 한번에 처리될 트랜잭션 단위를 얘기하며, Page Size는 한번에 조회할 Item의 양
Chunk Sizeは一度処理されるトランザクション単位で、
Page Sizeは一回照会するItemの量

※https://jojoldu.tistory.com/331から/問題あれば削除

Sample?

JobBuilderFactory
stepBuilderFactory
??Tasklet?

Scheduled cron>

@Bean
public Step ~~Step(){
return stepBuilderFactory
.get("~Step")
.tasklet(~Service)
.build();
};

@Bean
public Job processJob(){
return jobBuilderFactory.get("").
.incrementer(new RunIdIncrementer)
.start(~~Step())
.build();
}
※https://jojoldu.tistory.com/331#:~:text=Chunk%20Size%EB%8A%94%20%ED%95%9C%EB%B2%88%EC%97%90%20%EC%B2%98%EB%A6%AC,%EC%9D%98%20%EC%96%91%EC%9D%84%20%EC%96%98%EA%B8%B0%ED%95%A9%EB%8B%88%EB%8B%A4.