[HIVE-19127] Concurrency fixes in QueryResultsCache

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Assignee: Jason Dere
• Reporter: Jason Dere
• Created: 06/Apr/18 17:59
• Updated: 22/May/18 23:14
• Resolved: 09/Apr/18 23:55

Description

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

Issue Links

• links to: https://reviews.apache.org/r/66486/