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https://issues.apache.org/jira/browse/ARROW-494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-494.
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Resolution: Fixed
Issue resolved by pull request 298
[https://github.com/apache/arrow/pull/298]
> [C++] When MemoryMappedFile is destructed, memory is unmapped even if buffer
> referecnes still exist
> ---------------------------------------------------------------------------------------------------
>
> Key: ARROW-494
> URL: https://issues.apache.org/jira/browse/ARROW-494
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
>
> I'd like to see if there is some way to "protect" the memory map from
> premature destruction. This is a slight artifact of MemoryMappedFile's
> implementation sharing code with normal on-disk files (which read into
> allocated memory), i.e. the `Close` function unmaps the memory and closes the
> file handle. This would amount to creating a Buffer subclass that retains
> ownership of the file descriptor and memory map, so that if any Buffer still
> references the memory map, then `MemoryMappedFile::Close` will not unmap the
> memory or close the file. But then the unmapping / file close would need to
> happen when the last Buffer reference is destroyed.
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