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MongoDB.Driver.MongoCommandException: Command 'mapreduce' failed: too much data for in memory map/reduce (response: { "ok" : 0.0, "errmsg" : "too much data for in memory map/reduce", "code" : 13604, "codeName" : "Location13604"
怀疑是mongotemplate在未指定out集合的情况下,会在内存操作,制定out输出集合就正常了