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https://issues.apache.org/jira/browse/IMPALA-11887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17685001#comment-17685001
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Yuchen Fan commented on IMPALA-11887:
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Hi [~rizaon] , I think 'admission_control_slots' is a hard constraint. With
'admission_control_slots' is configured, we can set a base line of cluster
resources. It need to be well-designed and need to restart impalad. I want to
make mt_dop can be changed automaticly and well running below
'admission_control_slots' constraint. So we can use executors' CPU more
flexibility.
> Support auto adjust mt_dop when CPU utilization is high
> -------------------------------------------------------
>
> Key: IMPALA-11887
> URL: https://issues.apache.org/jira/browse/IMPALA-11887
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend
> Affects Versions: Impala 4.1.0
> Reporter: Yuchen Fan
> Assignee: Yuchen Fan
> Priority: Major
>
> Currently, when the CPU resources are relatively idle, enabling MT_DOP can
> significantly improve the query execution performance, but it will also
> increase the CPU usage. In the case of a sudden increase in query amount, the
> CPU resources of the executor may be exhausted. Therefore, a mechanism is
> needed to dynamically adjust the value of MT_DOP according to the CPU usage.
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