[HIVE-18899] Separate FetchWork required for each query that uses the results cache

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Labels: performance
• Assignee: Jason Dere
• Reporter: Jason Dere
• Created: 07/Mar/18 21:35
• Updated: 22/May/18 23:12
• Resolved: 12/Mar/18 21:42

Description

gopalv found issues when running lots of concurrent queries against HS2 with the query cache. Looks like the FetchWork held by the results cache cannot be shared between multiple queries because it contains a ListSinkOperator that is used to hold the results of a fetch.