Jason Dere created HIVE-19127:

             Summary: 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

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 
- 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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