Invalid path because of filename when hive load data local inpath - hadoop

Question

The file '/home/hadoop/_user_active_score_small' exactly exists. But when run load data local as below, get a SemanticException:
hive> load data local inpath '/home/hadoop/_user_active_score_small' overwrite into table user_active_score_tmp ;
FAILED: SemanticException Line 1:24 Invalid path ''/home/hadoop/_user_active_score_small'': No files matching path file:/home/hadoop/_user_active_score_small
But, cp /home/hadoop/_user_active_score_small /home/hadoop/user_active_score_small, and then run load data again:
hive> load data local inpath '/home/hadoop/user_active_score_small' overwrite into table user_active_score_tmp ;
Loading data to table user_bg_action.user_active_score_tmp
OK
Time taken: 0.368 seconds
The files' access type are the same, in the same directory:
-rw-rw-r-- 1 hadoop hadoop 614 7月 5 13:49 _user_active_score_small
-rw-rw-r-- 1 hadoop hadoop 614 7月 5 11:48 user_active_score_small
I don't know how does this happen. Is file name which starts with '_' not allowed by hive?

Answer 1

Files and directories that starts with underscore _ are considered hidden in MapReduce, that's probably the reason of the observed behavior.
If you look at FileInputFormat source code you can find this:
protected static final PathFilter hiddenFileFilter = new PathFilter(){
public boolean accept(Path p){
String name = p.getName();
return !name.startsWith("_") && !name.startsWith(".");
}
};