Pushdown Is Not Free: A Small-Scale Measurement of Storage-Side PII Redaction in Text-Cleaning Pipelines
Running data cleaning on storage nodes (“pushdown”) promises less data transfer and keeps sensitive content inside storage. We measure this trade-off for an LLM text-cleaning pipeline (heuristic filtering, language identification, regex PII redaction, MinHash signing) over 20k FineWeb documents with synthetic PII at th...