How to parallel read files in a directory

[Junjie Qian]

Hi all,
I am working with Spark 1.6, scala and have a big dataset divided into several 
small files.
My question is: right now the read operation takes really long time and often 
has RDD warnings. Is there a way I can read the files in parallel, that all 
nodes or workers read the file at the same time?
Many thanksJunjie