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?
A.
Four, all files will be processed
B.
Three, the pound sign is an invalid character for HDFS file names
C.
Two, file names with a leading period or underscore are ignored
D.
None, the directory cannot be named jobdata
E.
One, no special characters can prefix the name of an input file
Explanation:
Files starting with ‘_’ are considered ‘hidden’ like unix files starting with ‘.’.
# characters are allowed in HDFS file names.
C. The FileInputFormat filters out hidden files.
private static final PathFilter hiddenFileFilter = new PathFilter(){
public boolean accept(Path p){
String name = p.getName();
return !name.startsWith(“_”) && !name.startsWith(“.”);
}
};
0
0
C
0
0