Hdfs文件命名规则

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You have a directory named jobdata in HDFS that contains four files:
_first.txt, second.txt, .third.txt and #data.txt.
How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path
object representing this directory?

file names with a leading period or underscore are ignored

不能以下划线和点号开始,否则将被忽视

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