Great question! Rsync also uses a rolling hash/content defined chunking approach to deduplicate and reduce communication. So it will behave very similarly.
One more: do you prefer the CDC technique over using the rowgroups as chunks (ie using knowledge of the file structure)? Is it worth it to build a parquet-specific diff?
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How does this compare to rsync/rdiff?
Great question! Rsync also uses a rolling hash/content defined chunking approach to deduplicate and reduce communication. So it will behave very similarly.
One more: do you prefer the CDC technique over using the rowgroups as chunks (ie using knowledge of the file structure)? Is it worth it to build a parquet-specific diff?
I think both are necessary. The cdc technique is file format independent. The row group method makes Parquet robust to it.