Laurent Goujon created ARROW-3061:
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Summary: headroom does not take into account reservation
Key: ARROW-3061
URL: https://issues.apache.org/jira/browse/ARROW-3061
Project: Apache Arrow
Issue Type: Bug
Components: Java
Reporter: Laurent Goujon
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
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