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Posted to issues-all@impala.apache.org by "David Rorke (Jira)" <ji...@apache.org> on 2023/05/11 18:41:00 UTC

[jira] [Commented] (IMPALA-10180) Add average size of fetch requests in runtime profile

    [ https://issues.apache.org/jira/browse/IMPALA-10180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17721868#comment-17721868 ] 

David Rorke commented on IMPALA-10180:
--------------------------------------

Some summary latency metrics could also be useful here.  Ideally some histogram/percentile metrics on the delays between individual client fetch requests.  This would help identify cases of variable/transient client or network slowness.

> Add average size of fetch requests in runtime profile
> -----------------------------------------------------
>
>                 Key: IMPALA-10180
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10180
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Clients
>            Reporter: Sahil Takiar
>            Priority: Major
>
> When queries with a high {{ClientFetchWaitTimer}} it would be useful to know the average number of rows requested by the client per fetch request. This can help determine if setting a higher fetch size would help improve fetch performance where the network RTT between the client and Impala is high.



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