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https://issues.apache.org/jira/browse/IMPALA-10578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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wesleydeng updated IMPALA-10578:
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Description:
When a big query is running(use mt_dop=8), other query is very difficult to
start.
A small query (select distinct one field from a small table) may take about 1
minutes, normallly it take only about 1~3 second.
From the impalad log, I found a incomprehensible log like this:
!https://iwiki.woa.com/download/attachments/584684948/image2021-3-10_17-4-33.png?version=1&modificationDate=1615367074000&api=v2|width=768,height=180!
!image-2021-03-10-19-59-24-188.png|width=892,height=435!
When the Big query is running, data spilled has happened because mem_limit was
set and this big query waste a lot of memory.
was:
When a big query is running, other query is very difficult to start. >From the
impalad log, I found a incomprehensible log like this:
!https://iwiki.woa.com/download/attachments/584684948/image2021-3-10_17-4-33.png?version=1&modificationDate=1615367074000&api=v2!
!image-2021-03-10-19-59-24-188.png!
When the Big query is running, data spilled has happened because mem_limit was
set and this big query waste a lot of memory.
> Big Query influence other query seriously when hardware not reach limit
> ------------------------------------------------------------------------
>
> Key: IMPALA-10578
> URL: https://issues.apache.org/jira/browse/IMPALA-10578
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 3.4.0
> Environment: impala-3.4
> 80 machines with 96 cpu and 256GB mem
> Reporter: wesleydeng
> Priority: Major
> Attachments: image-2021-03-10-19-59-24-188.png
>
>
> When a big query is running(use mt_dop=8), other query is very difficult to
> start.
> A small query (select distinct one field from a small table) may take about
> 1 minutes, normallly it take only about 1~3 second.
> From the impalad log, I found a incomprehensible log like this:
> !https://iwiki.woa.com/download/attachments/584684948/image2021-3-10_17-4-33.png?version=1&modificationDate=1615367074000&api=v2|width=768,height=180!
> !image-2021-03-10-19-59-24-188.png|width=892,height=435!
>
> When the Big query is running, data spilled has happened because mem_limit
> was set and this big query waste a lot of memory.
>
>
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