cannot list files in a hdfs dir using new File.listFiles

Question

There is full permission to the folder I am trying to list but still, couldn't.

scala> new File("hdfs://mapdigidev/apps/hive/warehouse/da_ai.db/t_fact_ai_pi_ww").listFiles
res0: Array[java.io.File] = null

What tools allow you to list files and see there's something actually there? — 9000, May 01 '17 at 20:15
See http://stackoverflow.com/questions/27023766/spark-iterate-hdfs-directory. You need to use the libraries that know how to handle HDFS, and java.io does not. — Don Branson, May 01 '17 at 20:18

score 0 · Accepted Answer · answered May 01 '17 at 20:42

You can use the hadoop libraries to list files in hadoop:

import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{FileSystem, Path}

val fs = FileSystem.get(new URI("hdfs://mapdigidev"), new Configuration())
val files = fs.listFiles(new Path("/apps/hive/warehouse/da_ai.db/t_fact_ai_pi_ww"), false)

But java.io doesn't know about hadoop/hdfs.

cannot list files in a hdfs dir using new File.listFiles

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