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https://issues.apache.org/jira/browse/HIVE-19127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430949#comment-16430949
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Jason Dere commented on HIVE-19127:
-----------------------------------
re-attaching same patch to kick off ptests.
> Concurrency fixes in QueryResultsCache
> --------------------------------------
>
> Key: HIVE-19127
> URL: https://issues.apache.org/jira/browse/HIVE-19127
> Project: Hive
> Issue Type: Sub-task
> Reporter: Jason Dere
> Assignee: Jason Dere
> Priority: Major
> Attachments: HIVE-19127.1.patch, HIVE-19127.2.patch
>
>
> A few fixes around concurrent access in the results cache
> - Take a lock on the cache entry when in the process of setting the cache
> entry from PENDING state to VALID state, so that other threads cannot
> invalidate the entry
> - The write lock on the cache was not being taken when removing an entry from
> the cache.
> - synchronize access when iterating through the lru keyset
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