求助：hive执行带count(*)的sql会卡死，select*from是好的

Question

hive> select count(*) from test_table;
Query ID = root_20191112160909_6ae71ea3-5414-4b60-a7d1-dd7d8e629afe
Total jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
set hive.exec.reducers.bytes.per.reducer=
In order to limit the maximum number of reducers:
set hive.exec.reducers.max=
In order to set a constant number of reducers:
set mapreduce.job.reduces=

Answer 1

Michael_PK 2019-11-12 16:26:46

看看yarn UI上作业状态，以及的活的nm个数