Hi!
 I had a similar issue when the user that submit the job to the spark cluster didn't have permission to write into the hdfs. If you have the hdfs GUI then you can check which users are and what permissions. Also can in hdfs browser:(http://stackoverflow.com/questions/27996034/opening-a-hdfs-file-in-browser. ) if your folder structure was created.

If you have  yarn, an example ciuld be  spark-submit --class "yopur.class" --master yarn-client --num-executors 12 --executor-memory 16g --driver-memory 8g --executor-cores 8 <your.jar>.jar  hdfs://<namednode>/<your_user>/output

I hope it helps.
 Regards,\ Florin

On Wed, Jun 22, 2016 at 4:57 AM, Jeff Zhang <zjffdu@gmail.com> wrote:
Please check the driver and executor log, there should be logs about where the data is written. 



On Wed, Jun 22, 2016 at 2:03 AM, Pierre Villard <pierre.villard.fr@gmail.com> wrote:

Hi,

I have a Spark job writing files to HDFS using .saveAsHadoopFile method.

If I run my job in local/client mode, it works as expected and I get all my files written in HDFS. However if I change to yarn/cluster mode, I don't see any error logs (the job is successful) and there is no files written to HDFS.

Is there any reason for this behavior? Any thoughts on how to track down what is happening here?

Thanks!

Pierre.




--
Best Regards

Jeff Zhang