Dimitri Vorona created ARROW-3660:
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Summary: [C++] Don't unnecessary lock MemoryMappedFile for
resizing in readonly files
Key: ARROW-3660
URL: https://issues.apache.org/jira/browse/ARROW-3660
Project: Apache Arrow
Issue Type: New Feature
Components: C++
Affects Versions: 0.11.0
Reporter: Dimitri Vorona
We lock the resize_lock_ on every read, even though it's not possible to resize
read-only files.
This also inlines the ResizeMap method into Resize.
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