开源大数据平台 E-MapReduce表的相关内容

问答 2017-10-30 来自：开发者社区

E-MapReduce表管理是什么?

介绍从EMR-2.4.0版本开始，EMR支持了统一元数据管理，在EMR-2.4.0版本之前，用户所有集群均采用的是集群本地的mysql数据库作为hive元数据库，在EMR-2.4.0版本以及之后的版本中，EMR会支持统一的高可靠的hive元数据库: 用户可以选择在创建集群的时候，打开我们的元数据库的开关，从而使用外部的元数据库。 [backcolor=transparent]特别要注意的是...

问答 2017-07-18 来自：开发者社区

您好，请问MaxCompute（原ODPS）写mapreduce ，如果一个表的字段是分区字段，那这个字段根本拿不到是吗？我用命令 record.getString("relation") 我这个是分区字段，报错 aused by: java.lang.IllegalArgumentException: No such column:relation

您好，请问MaxCompute（原ODPS）写mapreduce ，如果一个表的字段是分区字段，那这个字段根本拿不到是吗？我用命令 record.getString("relation") 我这个是分区字段，报错aused by: java.lang.IllegalArgumentException: No such column:relation

问答 2016-02-19 来自：开发者社区

Mongodb的mapreduce如何实现只更新现有表的部分字段

MapRedue 的输出{"out", option }option可以是下面几个选项：•"collection name" – mapReduce的输出结果会替换掉原来的collection，collection不存在则创建•{ replace : "collection name" } – 同上•{ merge : "collection name" } – 将新老数据进行合并，新的替换旧的....

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更新时间 2023-08-10 09:23:59

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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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