Hadoop 使用JOIN优化配置单元查询,拥有百万条记录
我有两张桌子-Hadoop 使用JOIN优化配置单元查询,拥有百万条记录,hadoop,hive,Hadoop,Hive,我有两张桌子- bpm_agent_data - 40 Million records , 5 Columns bpm_loan_data - 20 Million records, 5 Columns 现在我在Hive中运行了一个查询- select count(bpm_agent_data.AgentID), count(bpm_loan_data.LoanNumber) from bpm_agent_data JOIN bpm_loan_data where bpm_loan_dat
bpm_agent_data - 40 Million records , 5 Columns
bpm_loan_data - 20 Million records, 5 Columns
现在我在Hive中运行了一个查询-
select count(bpm_agent_data.AgentID), count(bpm_loan_data.LoanNumber) from bpm_agent_data JOIN bpm_loan_data where bpm_loan_data.id = bpm_agent_data.id;
这需要很长时间才能完成。
在配置单元中编写查询的理想方式应该是什么,这样Reducer就不会占用这么多时间。找到了上述查询的解决方案, 替换为ON
select count(bpm_agent_data.AgentID), count(bpm_loan_data.LoanNumber) from bpm_agent_data JOIN bpm_loan_data ON( bpm_loan_data.id = bpm_agent_data.id);