mapreduce类型-阿里云

[帮助文档] 如何创建Dependent类型任务

DEPENDENT节点是指用于进行依赖检查的节点。例如，如果A流程依赖于昨天成功执行的B流程，则依赖节点将会检查昨天B流程是否成功执行过实例。本文为您介绍创建DEPENDENT类型任务时涉及的参数。

[帮助文档] 如何基于Dataphin构建MapReduce类型的离线计算任务

本文为您介绍如何基于Dataphin构建MapReduce类型的离线计算任务。

Hadoop 分布式计算框架 MapReduce

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在阿里云的E-MapReduce中，对数组类型进行聚合操作需要使用特定的函数

在阿里云的E-MapReduce中，对数组类型进行聚合操作需要使用特定的函数。对于你的问题，你可以使用FLATTEN函数来"炸开"数组，然后使用COLLECT函数进行聚合。你的SQL查询可以修改如下： SELECT COLLECT(a) as a_collected, FLATTEN(c) as ...

[帮助文档] 如何创建DataX类型任务

DataX任务类型，用于执行DataX程序。本文为您介绍创建DataX类型任务时涉及的参数。

[帮助文档] 如何创建Switch类型任务

SWITCH一个条件判断节点，依据全局变量的值和用户所编写的表达式判断结果执行对应分支。本文为您介绍创建SWITCH类型任务时涉及的参数。

[帮助文档] 如何创建Conditions类型任务

CONDITIONS节点是一个条件节点，其根据上游任务的运行状态来判断应该运行哪个下游任务。CONDITIONS节点可以支持多个上游任务，但只能支持两个下游任务。如果上游任务数超过一个，则可以通过“且”、“或”操作符来实现复杂上游依赖。本文为您介绍创建CONDITIONS类型任务时涉及的参数。

E-MapReduce哪些集群类型支持EMR Doctor功能

MapReduce中程序员需要做什么呢？每个阶段的类型怎样选择？

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更新时间 2024-04-30 19:37:33

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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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立即开通

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StarRocks 免费试用

产品入门

快速入门指导

常见问题

最佳实践

EMR实时计算实践