hive执行sql卡住了

来源：1-24 -Hive环境搭建

starkpan

2018-10-31

hive安装成功，加载hello.txt文件很快，但是执行语句
hive> select word, count(1) from hive_wordcount lateral view explode(split(context,’\t’)) wc as word group by word;
开始执行：
Query ID = hadoop_20181031221313_42a99fce-5e62-4d88-a0de-ded7ac2cbb07
Total jobs = 1
Launching Job 1 out of 1
Number of reduce tasks not specified. Estimated from input data size: 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=
卡住不动了。

虚拟机virtualbox配置为4核，内存设置为8G。运行mysql，hadoop，hive三个软件。内存和cpu占用率不高，不应该跑不动呐。

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