[jira] [Resolved] (ARROW-3061) [Java] headroom does not take into account reservation

["Siddharth Teotia (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siddharth Teotia resolved ARROW-3061.
-------------------------------------
       Resolution: Fixed
         Assignee: Laurent Goujon
    Fix Version/s: 0.11.0

> [Java] 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
>            Assignee: Laurent Goujon
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.11.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> 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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