[YARN-8921] SnapshotBasedOverAllocationPolicy always caps the amount of memory availabe to 4 GBs

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: YARN-1011
• Fix Version/s: YARN-1011
• Hadoop Flags: Reviewed
• Assignee: Haibo Chen
• Reporter: Haibo Chen
• Created: 19/Oct/18 19:05
• Updated: 26/Oct/18 16:57
• Resolved: 26/Oct/18 16:57

Description

The memory overallocate threshold is a float, so is (overAllocationThresholds.getMemoryThreshold() *
containersMonitor.getPmemAllocatedForContainers()). Because Math.round(float) return an int, this would cap effectively the amount of memory available for overallocation to Integer.MAX_VALUE, see the code at here