kevinjqliu commented on issue #2138:
URL: 
https://github.com/apache/iceberg-python/issues/2138#issuecomment-4007166972

   upsert uses `ArrowScan.to_record_batches`. theres a bug right now where 
multi-threaded workers end up consuming a lot of memory together. I've tried to 
summariz it in this discussion thread, 
https://github.com/apache/iceberg-python/discussions/3122
   
   Let's figure out the best path forward


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