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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/08/23 08:10:00 UTC

[jira] [Updated] (HIVE-18920) CBO: Initialize the Janino providers ahead of 1st query

     [ https://issues.apache.org/jira/browse/HIVE-18920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HIVE-18920:
----------------------------------
    Labels: pull-request-available  (was: )

> CBO: Initialize the Janino providers ahead of 1st query
> -------------------------------------------------------
>
>                 Key: HIVE-18920
>                 URL: https://issues.apache.org/jira/browse/HIVE-18920
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>            Reporter: Gopal Vijayaraghavan
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>         Attachments: HIVE-18920.01.patch, HIVE-18920.02.patch, HIVE-18920.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Hive Calcite metadata providers are compiled when the 1st query comes in.
> If a second query arrives before the 1st one has built a metadata provider, it will also try to do the same thing, because the cache is not populated yet.
> With 1024 concurrent users, it takes 6 minutes for the 1st query to finish fighting all the other queries which are trying to load that cache.



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