Reading JSON files from Hadoop with Spark

Question

I have several JSON files (zipped with .gz format) in some HDFS directories in a tree like:

/master/dir1/file1.gz
       /dir2/file2.gz
       /dir3/file3.gz
       ...

I need to read those files from the path /master/ and join them into a RDD with Spark in Java. How could I do it?

Answer 1

[Edit] If

JavaRDD<String> textFile = sc.textFile("hdfs://master/dir*/file*");

doesn't work, another way is to list the files and union

fileSystem.listStatus(new Path("hdfs://master/dir*"))
  .filter(d -> d.isDirectory())
  .map(p -> sc.textFile(p.getPath()))
  .reduce((a, b) -> a.unionAll(b))