[IMPALA-4831] Clients can violate BufferPool invariants by calling ReservationTracker methods directly.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.9.0
• Fix Version/s: Impala 2.9.0
• Component/s: Backend
• Labels: resource-management
• Target Version: Product Backlog
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 26/Jan/17 22:35
• Updated: 16/Mar/17 03:36
• Resolved: 16/Mar/17 03:36

Description

If a client unpins some pages, then calls ReservationTracker::DecreaseReservation(), it can leave too many dirty unpinned pages in memory.

Similarly, a client can cause mischief by calling AllocateFrom() and ReleaseTo() or by creating child ReservationTrackers.