Hive join_第3页-阿里云

hive中join的on和where

昨天发现线上有一个job用了1w多个map，导致其他job一直在等待mapred资源为了避免影响别的job，暂时先杀掉，然后分析原因。一般产生大量map有两个原因： 1.输入的数据量比较大，导致根据split产生map时有大量的map产生 2.小文件比较多，同时没有使用combine的input...

hive join

hive0.11之前，默认的join方式是reduce端join，即shuffle join(hive.auto.convert.join默认为false),其原理是map的输出数据通过hash进行partition，然后shuffle至对应的reduce端,执行join.如果join key分布不...

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HIVE中join、semi join、outer join举例详解

举例子： hive> select * from zz0; 111111 222222 888888 hive> select * from zz1; 111111 333333 444444 ...

Hive连接JOIN用例详解（转载）

转自： https://my.oschina.net/iamchenli/blog/845850 http://www.cnblogs.com/xing901022/p/5804836.html

[Hadoop]Hive r0.9.0中文文档（二）之联表查询Join

一、Join语法 join_table: table_reference [INNER] JOIN table_factor [join_condition] | table_reference {LEFT|RIGHT|FULL} [OUTER] JOIN table_reference join_...

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开源大数据平台 E-MapReduce

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