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https://issues.apache.org/jira/browse/HIVE-9729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349417#comment-14349417
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Sergey Shelukhin commented on HIVE-9729:
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Actually, it seems like one can abstract things a little bit to enable using 
multiple caches with the same eviction policy. So

> LLAP: design and implement proper metadata cache
> ------------------------------------------------
>
>                 Key: HIVE-9729
>                 URL: https://issues.apache.org/jira/browse/HIVE-9729
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>             Fix For: llap
>
>
> Simple approach: add external priorities to data cache, read metadata parts 
> of orc file into it. Advantage: simple; consistent management (no need to 
> coordinate sizes and eviction between data and metadata caches, etc); 
> disadvantage - have to decode every time.
> Maybe add decoded metadata cache on top - fixed size, small and 
> opportunistic? Or some other approach.



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