[ARROW-3061] [Java] headroom does not take into account reservation

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Component/s: Java
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/19419
• Assignee: Laurent Goujon
• Reporter: Laurent Goujon
• Created: 15/Aug/18 17:39
• Updated: 11/Jan/23 07:24
• Resolved: 07/Sep/18 21:18

Description

It looks like BufferAllocator#getHeadroom() does not take into account current allocator reservation. For example if a parent allocator has a limit of 10, and a child allocator is created with a reservation of 6, the headroom of the parent is 4, and the current headroom will report 4, but the actual headroom is 10 because the child has no memory used and so can use the full extend of its reservation on top of what the parent allocator can allocate

Issue Links

• links to: GitHub Pull Request #2434