Num_async_bytes_read

What does the NUM_ASYNC_BYTES_READ indicate in the Operator Metrics Profile ? How is it different from the PARQUET_BYTES_READ field ?

@vrb Dremio uses async reads to reduce wait time on PARQUET SCANS, this will result in async bytes always > the actual parquet bytes read

Thanks. But what does the field indicate. ? How is it different from the PARQUET_BYTES_READ field ?

@vrb Because we reading in chunks of 1MB while using async… we may read some bytes that are not needed… the difference would be small though, if you see a bigger difference kindly send us the profile