春季批处理不处理所有记录 [英] spring batch not processing all records

问题描述

我正在使用Spring Batch使用RepositoryItemReader从Postgresql DB中读取记录，然后将其写入主题.我看到大约有100万条记录需要处理，但它并没有处理所有记录.我已将阅读器的pageSize设置为10,000，并且与提交间隔(块大小)相同

I am using spring batch to read records from postgresql DB using RepositoryItemReader and then write it to a topic. I see that there were around 1 million records which had to be processed but it didn't process all the records. I have set pageSize for reader as 10,000 and same as commit interval (chunk size)

@Bean
public TaskletStep broadcastProductsStep(){
    return stepBuilderFactory.get("broadcastProducts")
            .<Product, Product> chunk(10000)
            .reader(productsReader.repositoryItemReader())
            .processor(productsProcessor)
            .writer(compositeItemWriter)                    
            .faultTolerant()
            .skip(Exception.class)                              
            .skipLimit(100000)
            .processorNonTransactional()                        
            .listener(new SkipListenerProducts())               
            .listener(productsChunkListener)
            .build();
}


@Bean
public RepositoryItemReader repositoryItemReader() {

    RepositoryItemReader<Product> repositoryReader = new RepositoryItemReader<>();

    try {
        repositoryReader.setRepository(skuRepository);
        repositoryReader.setMethodName("findByIsUpdatedAndStatusCodeIn");
        repositoryReader.setPageSize(10000);
        repositoryReader.setSaveState(false);

        List<List<String>> arguments = new ArrayList<>();
        arguments.add(Stream.of(SkuStatus.RELEASED.getValue().toString(), SkuStatus.BLOCKED.getValue().toString(),
                SkuStatus.DISCONTINUED.getValue().toString())
                  .collect(Collectors.toList()));
        repositoryReader.setArguments(arguments);

        Map sorts = new HashMap();
        sorts.put("catalog_number", Sort.Direction.ASC);

        repositoryReader.setSort(sorts);
        repositoryReader.afterPropertiesSet();

    } catch (Exception exception){
        exception.printStackTrace();
    }

    return repositoryReader;
}

@Query(value = "SELECT * FROM CATALOG.PRODUCTS WHERE IS_UPDATED = 'true' AND STATUS_CODE IN (:statusCode)",
       countQuery = "SELECT COUNT(*) FROM CATALOG.PRODUCTS WHERE IS_UPDATED = 'true' AND STATUS_CODE IN (:statusCode)",
       nativeQuery = true)
public Page<Product> findByIsUpdatedAndStatusCodeIn(@Param(value = "statusCode") List<String> statusCode, 
        Pageable pageable);

推荐答案

问题可能是您在混用分页并根据阅读器查询(IS_UPDATED)的条件进行更新.

The problem is probably that you're mixing pagination and update on the criteria of the reader query (IS_UPDATED).

示例，页面大小= 2，db中有6行

Example with page size = 2 and 6 lines in db

• IS_UPDATED = true
• B IS_UPDATED = true
• C IS_UPDATED = true
• D IS_UPDATED = true
• E IS_UPDATED = true
• F IS_UPDATED = true

第一页读取= 1条返回线A和B

First read page = 1 return lines A and B

执行写程序后(将A& B的IS_UPDATED设置为false)，我们在db中:

After writer execution (set IS_UPDATED to false for A & B), we have in db :

• C IS_UPDATED = true
• D IS_UPDATED = true
• E IS_UPDATED = true
• F IS_UPDATED = true

二读将移至第2页，因此将占用E行和&行.F ，而不是C&D

Second read will move to page 2 so it will take line E & F and not C & D

任何一个:

1. 您不应更新IS_UPDATED列.
2. 或者您创建 RepositoryItemReader 的子类，并在其中重写getPage

1. you should not update the IS_UPDATED column.
2. Or you create a subclass of RepositoryItemReader and where you override getPage

    @Override
    public int getPage() {
        return 0;
    }

选项2对于批处理崩溃/错误更具适应性，但是您必须确保在编写器中IS_UPDATED始终设置为false，否则读取器将无限期循环.

Option 2 is more resilient to batch crash / error but you have to make sure IS_UPDATED is always set to false in your writer otherwise the reader will indefinitely loop.

如果您使用的是多线程步骤，那么选项2也将需要更多的调整.

Option 2 will also need more tuning if you're using multithreaded step.

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