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https://issues.apache.org/jira/browse/ARROW-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dimitri Vorona updated ARROW-2701:
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    External issue URL: https://github.com/apache/arrow/pull/2205  (was: 
https://github.com/apache/arrow/pull/2134)

> [C++] Make MemoryMappedFile resizable
> -------------------------------------
>
>                 Key: ARROW-2701
>                 URL: https://issues.apache.org/jira/browse/ARROW-2701
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>    Affects Versions: 0.9.0
>            Reporter: Dimitri Vorona
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 9h 40m
>  Remaining Estimate: 0h
>
> Hi,
> I don't see any reason for the MemoryMappedFile not to be resizable, e.g. 
> like it is in Python stdlib. This patch changes the base class of 
> MemoryMappedFile to ResizableBuffer and implements mmap resizing similar to 
> [mmap.resize|https://github.com/python/cpython/blob/415bc46a78e785f357c8960ae70f18a6b6cccbb6/Modules/mmapmodule.c#L454]
>  from python stdlib.
> If the change is ok, we should probably change the comment 
> [here|https://github.com/apache/arrow/blob/master/python/pyarrow/tests/test_io.py#L577],
>  too.
> Cheers,
> Dimitri.



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