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https://issues.apache.org/jira/browse/HIVE-18039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16246961#comment-16246961
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Alexander Kolbasov commented on HIVE-18039:
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It is also worth considering 3-rd party Cache implementations - e.g. Caffeine
(https://github.com/ben-manes/caffeine).
> Use ConcurrentHashMap for CachedStore
> -------------------------------------
>
> Key: HIVE-18039
> URL: https://issues.apache.org/jira/browse/HIVE-18039
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Affects Versions: 3.0.0
> Reporter: Alexander Kolbasov
>
> SharedCache used by CachedStore uses single big lock to synchronize all
> access. This looks like an overkill - looks like it is possible to use
> ConcurrentHashMap instead. Also it makes sense to move deepCopy() operations
> outside the lock to reduce lock hold times.
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