mapreduce groupingcomparator-阿里云

36 MAPREDUCE自定义GroupingComparator

需求有如下订单数据:现在需要求出每一个订单中成交金额最大的一笔交易。分析1、利用“订单id和成交金额”作为key，可以将map阶段读取到的所有订单数据按照id分区，按照金额排序，发送到reduce。2、在reduce端利用groupingcomparator将订单id相同的kv聚合成组，然后取第一个...

Hadoop MapReduce工作详细流程（Partitioner/SortComparator/GroupingComparator）

转自：http://blog.sina.com.cn/s/blog_7581a4c30102veem.html map阶段 1. 使用job.setInputFormatClass(TextInputFormat)做为输入格式。注意输出应该符合自定义Map中定义的输出。 2. 进入Mapper的ma...

Hadoop 分布式计算框架 MapReduce

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开源大数据平台 E-MapReduce

开源大数据平台 E-MapReduce（简称“EMR”）是云原生开源大数据平台，向客户提供简单易集成的Hadoop、Hive、Spark、Flink、Presto、ClickHouse、StarRocks、Delta、Hudi等开源大数据计算和存储引擎服务。

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