Gopal V created HIVE-18920:
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Summary: 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
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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