开源大数据平台 E-MapReduce maxcompute 的相关内容

问答 2017-07-04 来自：开发者社区

看Maxcompute说明文档说输入数据只能是表结构是否可以跑用户自定义的原生的基于hdfs的Mapreduce任务，输入为hdfs文件，输出为hdfs文件，mapper的逻辑以及reducer的逻辑用户自定义实现

看Maxcompute说明文档说输入数据只能是表结构是否可以跑用户自定义的原生的基于hdfs的Mapreduce任务，输入为hdfs文件，输出为hdfs文件，mapper的逻辑以及reducer的逻辑用户自定义实现

文章 2017-05-21 来自：开发者社区

MaxCompute MapReduce

前言 MapReduce已经有文档，用户可以参考文档使用。本文是在文档的基础上做一些类似注解及细节解释上的工作。功能介绍 MapReduce 说起MapReduce就少不了WordCount，我特别喜欢文档里的这个图片。比如有一张很大的表。表里有个String字段记录的是用空格分割开单词。最后需要统计所有记录中，每个单词出现的次数是多少。那整体的计算流程是输入阶段：根据工作量，生成几个Ma.....

文章 2016-12-30 来自：开发者社区

MaxCompute（原ODPS） MapReduce常见问题解答

本文用到的阿里云数加－大数据计算服务MaxCompute产品地址：https://www.aliyun.com/product/odps 1. 作业出现ClassNotFoundException和NoClassDefFoundError异常失败？ A: 对于ClassNotFoundException异常，一般是依赖的class不在你的jar包中，需要把依赖的库打到作业jar包中或者单独上.....

文章 2016-10-21 来自：开发者社区

MaxCompute Studio提升UDF和MapReduce开发体验

随着 MaxCompute 2.0 的发布，我们提供了MaxCompute Studio，一套基于IntelliJ IDEA的开发插件，让用户在集成开发环境（IDE）中更方便地进行SQL及用户代码开发。MaxCompute Studio 为开发者提供了良好的开发体验，支持项目空间浏览、SQL 脚本开发，UDF开发和调试，作业执行状态展示等功能，本系列将逐一展开进行介绍。第一弹 - 元数据浏览第....

文章 2016-10-11 来自：开发者社区

MaxCompute MapReduce的7个性能优化策略

1. 输入表的列裁剪对于列数特别多的输入表，Map阶段处理只需要其中的某几列，可以通过在添加输入表时明确指定输入的列，减少输入量；例如只需要c1,c2俩列，可以这样设置： InputUtils.addTable(TableInfo.builder().tableName("wc_in").cols(new String[]{"c1","c2"}).build(), job); 设置之后，你.....

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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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EMR实时计算实践