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https://issues.apache.org/jira/browse/HIVE-18920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16783693#comment-16783693
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Ashutosh Chauhan commented on HIVE-18920:
-----------------------------------------
+1
> 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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