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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