bltools upgrade --from-version 2.1

This script checks your bltools.yaml for deprecated keys (e.g., threads is now parallel_threads) and suggests corrections.

Solution: Use --batch-size 10000 to limit row batches in memory. v2.2’s default batch size is 50,000; lowering it reduces memory pressure.

Solution: While not previously required, v2.2 uses Arrow for adaptive parallelization. Install via pip install bltools[arrow].