java - Spring 中 'Sort exceeded memory limit' MongoDb 的问题

Question

我正在编写一个使用 MongoRepository 实现查询的方法，我在 Java/Spring 项目中使用聚合，但在我测试时它给出了超出的内存限制。

我试过

newAggregationOptions().cursorBatchSize(pageable.getPageSize()).allowDiskUse(true).build()

但没用

我的方法:

...
        var matchCriteria = match(criteria);

        var unwindVariations = unwind("variations", false);


        var sort = sort(Sort.Direction.ASC, "variations.plataformStatus.status");

        var countResult = count().as("totalElements");
        var aggregationOptions = Aggregation.newAggregationOptions().cursorBatchSize(pageable.getPageSize()).allowDiskUse(true).build();

        var countAggregation = newAggregation(
                matchCriteria,
                unwindVariations,
                sort,
                countResult)
                .withOptions(aggregationOptions);

        var totalElements = mongoTemplate.aggregate(countAggregation, "PRODUCT", Map.class).getMappedResults();

错误信息:

com.mongodb.MongoCommandException: Command failed with error 16819 (Location16819): 'Sort exceeded memory limit of 104857600 bytes, but did not opt in to external sorting. Aborting operation. Pass allowDiskUse:true to opt in.' on server cluster0-shard-00-01-du380.mongodb.net:27017.

Answer 1

您应该启用allowDiskUse 选项。

默认情况下，排序操作有 100MB 的限制(在内存中)，在您的操作中启用该选项将允许使用更大的大小。

来自 MongoDB's sort documentation :

The $sort stage has a limit of 100 megabytes of RAM. By default, if the stage exceeds this limit, $sort will produce an error. To allow for the handling of large datasets, set the allowDiskUse option to true to enable $sort operations to write to temporary files.