renyd123 opened a new issue, #42096:
URL: https://github.com/apache/arrow/issues/42096
### Describe the enhancement requested
I encountered a performance issue when calling the
FileReader::RowGroup(i)->ReadTable interface in a multi-threaded environment.
For a RowGroup with 1 million rows, when the number of threads is 1,
FileReader::RowGroup(i)->ReadTable takes around 40ms. However, as the number of
threads increases, the execution time also increases gradually. When the number
of threads reaches 16, the execution time reaches around 250ms.
This is reflected in the overall file parsing performance, where using 16
threads is only about 5 times faster than using a single thread.
Is this issue caused by locking or I/O in the interface? Are there any other
methods for multi-threaded parsing?
### Component(s)
C++
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