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From Skye Wanderman-Milne <s...@cloudera.com>
Subject Re: impala query spend too much time on codegen
Date Wed, 23 Mar 2016 16:04:58 GMT
+user@impala.incubator.apache.org

Currently the only option is to disabled codegen, there are no
configuration options to make it faster.

On Wed, Mar 23, 2016 at 9:00 AM, John Russell <jrussell@cloudera.com> wrote:

> If codegen overhead is excessive for short queries, the workaround that I
> know is setting the DISABLE_CODEGEN query option to TRUE:
>
>
> http://www.cloudera.com/documentation/enterprise/latest/topics/impala_disable_codegen.html
>
> If there are configuration or diagnostic steps that can make codegen
> faster without turning it off, I'd like to learn details so I could add
> such info to the docs.
>
> John
>
> On Mar 23, 2016, at 6:01 AM, zhang song <zsyuyizhang@gmail.com> wrote:
>
> Met the same problem,  codegen time seems to be to much high (more than
> 2s, given total query time 8s). Is there any method to reduce this time ?
>
> 在 2016年3月23日星期三 UTC+8下午2:21:32,zhen写道:
>>
>> every  plan fragment  execute  too mush  codegen   2s +
>>
>> for example:
>>
>>   - LoadTime:500ms
>>
>>   - PrepareTime:640ms
>>   - CodegenTime: 14.902ms
>>   - CompileTime: 50.744ms
>>   - OptimizationTime: 694.186ms
>>
>>
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