Exceeded memory limit for $group

Mongo error when using aggregation: sort exceeded memory limit

How to aggregate on huge array in mongoDB? - Stack Overflow

MongoDB : Sort exceeded memory limit of 104857600 bytes

MongoDB 2.6 is $out - DZone Java

2016年8月31日 - Exceeded memory limit for $group, but didn't allow external sort. Pass allowDiskUse:true to opt in {代码...}

mapreduce - MongoDB allowDiskUse not working.. - Stack Overflow

[SERVER-13002] out of memory - MongoDB

exceeded memory limit for group的中文翻译_百度翻译