set hive.exec.parallel.thread.number=30;
时间: 2024-04-20 16:22:10 浏览: 13
set hive.exec.parallel.thread.number=30; 的意思是设置Hive执行并行线程数为30。在Hive查询中,可以通过并行执行来提高查询的处理速度。通过设置并行线程数,可以让Hive同时执行多个任务,从而提高查询的并发性和效率。根据系统的资源情况和查询的复杂度,可以适当调整并行线程数来达到最佳的查询性能。
相关问题
hive> set hive.cli.print.header=true;set hive.cli.print.current.db=true;set hive.cli.print.row.to.vertical=true;set mapred.output.encoding=UTF-8;set mapred.input.encoding=UTF-8;set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;set hive.exec.compress.output=false;set hive.exec.compress.intermediate=false;set hive.vectorized.execution.enabled=true;set hive.vectorized.execution.reduce.enabled=true;set hive.vectorized.execution.reduce.groupby.enabled=true; Query returned non-zero code: 1, cause: hive configuration hive.cli.print.row.to.vertical does not exists. hive (default)>
抱歉,之前提供的配置有误,可能是因为不同版本的Hive配置不同。以下是一组通用的配置,可以尝试在Hive中执行:
```
set hive.cli.print.header=true;
set hive.cli.print.current.db=true;
set hive.cli.print.row.to.vertical=false;
set mapred.output.encoding=UTF-8;
set mapred.input.encoding=UTF-8;
set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;
set hive.exec.compress.output=false;
set hive.exec.compress.intermediate=false;
set hive.vectorized.execution.enabled=true;
set hive.vectorized.execution.reduce.enabled=true;
set hive.groupby.skewindata=true;
```
这组配置可以将Hive的输出编码方式设置为UTF-8,并启用一些Hive的优化方式。如果还有其他问题,请告诉我。
set hive.exec.reducers .max=<number>
The configuration parameter `hive.exec.reducers.max` is used to set the maximum number of reducers that can be used by a single Hive job. This parameter is used to limit the number of reducers for a particular job in order to prevent the job from consuming too many resources and causing performance issues.
To set this parameter, you need to use the following syntax:
```
set hive.exec.reducers.max=<number>;
```
where `<number>` is the maximum number of reducers that can be used by a Hive job. For example, if you want to set the maximum number of reducers to 10, you can use the following command:
```
set hive.exec.reducers.max=10;
```
Note that this parameter is only used when the number of reducers is not explicitly set for a particular job. If the number of reducers is set explicitly, then this parameter is ignored.