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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/11/23 20:08:00 UTC

[jira] [Resolved] (IMPALA-8125) Limit number of files generated by insert

     [ https://issues.apache.org/jira/browse/IMPALA-8125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong resolved IMPALA-8125.
-----------------------------------
    Fix Version/s: Impala 4.0
       Resolution: Fixed

> Limit number of files generated by insert
> -----------------------------------------
>
>                 Key: IMPALA-8125
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8125
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Frontend
>            Reporter: Tim Armstrong
>            Assignee: Bikramjeet Vig
>            Priority: Major
>              Labels: multithreading
>             Fix For: Impala 4.0
>
>
> One pitfall of multithreaded execution is that, if implemented naively, the number of files generated by an unpartitioned insert will be multiplied by mt_dop.
> We should provide a mechanism to limit the number of files generated, e.g. limit the number of insert fragment instances (note that there a pre-existing problem with unpartitioned inserts generating too many files).



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