Amazon AWS data Lake Work Pit 1

pit 1：aws Of s3 File storage , When you upload a file, be sure to click to select , Otherwise, even if the subsequent upload succeeds , follow-up glue Cannot get the file when reading
pit 2： If the crawler makes an error , Reset directly , Because even if the modification is correct , May still report an error , Don't ask me why I know （ The conclusion drawn from the comparison again and again ）