有没有办法在不使用管道的情况下检查Apache Beam sdk中是否存在文件

Question

I am currently trying to check if file exists on cluster by using the MatchResult status. Even if the file exists it is returning the status as NOT_FOUND.

MatchResult matchResult = FileSystems.match(output string)

if(matchResult.status() == MatchResult.Status.NOT_FOUND){
//do some operation 
//print file does not exist
}
else{
//print file exists
}

the above code is returning status as not found even if file exists.

Answer 1

What kind of file system is on your cluster? AFAIK, Beam file system supports only S3, GCS, HDFS and local FS. Also, it would worth to print out "matchResult" and see the full path if it matches with your real path on cluster.