Antoine Pitrou created ARROW-2427:

             Summary: [C++] ReadAt implementations suboptimal
                 Key: ARROW-2427
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
    Affects Versions: 0.9.0
            Reporter: Antoine Pitrou

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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