Reducer 输入的键值对.Reducer 输入的键值对.MapOutput,增加 Reducer 输入的键值对.MapOutput 和 reduceId,增加 Reducer 输入的键值对.Record.Record).RecordComparator.RecordComparator.Counters.Mapper 输出到给定 reduceId 的键值对列表.Record>.Record>.Record>.Record>.Record 进行比较.Mapper 单元测试的上下文.Reducer 单元测试的上下文.Mapper 过程.Reducer 过程.Copyright © 2020 Alibaba Cloud Computing. All rights reserved.