ASF GitHub Bot commented on ARROW-2427:

pitrou opened a new pull request #1867: [WIP] ARROW-2427: [C++] Implement 
ReadAt properly
URL: https://github.com/apache/arrow/pull/1867
   Allow for concurrent I/O by avoiding locking and seeking.

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> [C++] ReadAt implementations suboptimal
> ---------------------------------------
>                 Key: ARROW-2427
>                 URL: https://issues.apache.org/jira/browse/ARROW-2427
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 0.9.0
>            Reporter: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
> The {{ReadAt}} implementations for at least {{OSFile}} and 
> {{MemoryMappedFile}} take the file lock and seek. They could instead read 
> directly from the given offset, allowing concurrent I/O from multiple threads.

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