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From "Jesus Camacho Rodriguez (JIRA)" <>
Subject [jira] [Comment Edited] (HIVE-18920) CBO: Initialize the Janino providers ahead of 1st query
Date Fri, 01 Mar 2019 01:12:00 GMT


Jesus Camacho Rodriguez edited comment on HIVE-18920 at 3/1/19 1:11 AM:

Created HIVE-21365.

was (Author: jcamachorodriguez):
Created HIVE-21343.

> CBO: Initialize the Janino providers ahead of 1st query
> -------------------------------------------------------
>                 Key: HIVE-18920
>                 URL:
>             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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