Jesus Camacho Rodriguez created HIVE-24176:
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             Summary: Create query-level cache for HMS requests and extend 
existing local HS2 HMS cache
                 Key: HIVE-24176
                 URL: https://issues.apache.org/jira/browse/HIVE-24176
             Project: Hive
          Issue Type: Improvement
          Components: HiveServer2
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


This issue creates a query-level cache for HMS requests. The lifecycle of that 
cache is associated to the lifecycle of the query. This basically means that 
each unique request to certain HMS APIs should only be served once from HMS, 
while follow-up repetitive calls will be retrieved from cache. The initial 
implementation includes caching for 19 APIs.

This issue also extends existing local HS2 HMS cache implementation introduced 
in HIVE-23949 to support other requests (getTableColumnStatistics, 
getPartitionsByNames). In fact, implementation relies on some of the logic 
introduced in that JIRA since there are some commonalities.



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