Spark log - not showing on the screen

When i try to run the spark job, i am not getting any log displayed on the screen and unable to get the tracking URL. The job runs successfully but no log displayed on the screen Please advice

[smadar81@gw01 ~]$ spark-submit --class WordCount \

–master yarn
–conf spark.ui.port=27626
–num-executors 6
–executor-cores 2
–executor-memory 2G
sparkproject_2.10-1.0.jar /public/randomtextwriter /user/smadar81/wccount3 prod
Multiple versions of Spark are installed but SPARK_MAJOR_VERSION is not set
Spark1 will be picked by default
spark.yarn.driver.memoryOverhead is set but does not apply in client mode.
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