Answer-first summary for fast verification
Answer: It is achieved by storing file metadata in RocksDB at the checkpoint location.
Auto Loader uses RocksDB in the checkpoint location to track processed files and ensure exactly-once processing.
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Which statement about Auto Loader’s exactly-once guarantee is correct?
A
It is achieved by watermarking late data.
B
It is achieved by storing file metadata in RocksDB at the checkpoint location.
C
It is achieved by file notification mode only.
D
It is achieved by schema evolution.
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