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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2019/03/01 01:12:00 UTC

[jira] [Commented] (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:comment-tabpanel&focusedCommentId=16781153#comment-16781153 ] 

Jesus Camacho Rodriguez commented on HIVE-18920:
------------------------------------------------

Created HIVE-21343.

> 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
>            Reporter: Gopal V
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-18920.01.patch, HIVE-18920.02.patch, HIVE-18920.patch
>
>
> 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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