Ziheng Wang created ARROW-17299:
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Summary: Expose the Scanner kDefaultBatchReadahead and
kDefaultFragmentReadahead parameters
Key: ARROW-17299
URL: https://issues.apache.org/jira/browse/ARROW-17299
Project: Apache Arrow
Issue Type: New Feature
Components: C++, Python
Reporter: Ziheng Wang
Assignee: Ziheng Wang
In the Scanner there are parameters kDefaultFragmentReadahead and
kDefaultBatchReadahead that are currently set to fixed numbers that cannot be
changed.
This is not great because tuning these numbers is the key to tradeoff RAM usage
and network IO utilization during reading. For example on an i3.2xlarge
instance on AWS you can get peak throughput only by quadrupling
kDefaultFragmentReadahead from the default.
The current settings are very conservative and assume a < 1Gbps network.
Exposing them allow people to tune the Scanner behavior to their own hardware.
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