Hive on Spark for simple hive queries

[Prabu Soundar Rajan -X (prabsoun - MINDTREE LIMITED at Cisco)]

Hi Team,

In spite of setting hive execution engine as Spark, when we try simple hive 
queries having only mapper phase like (select * from table where column=xyz) - 
we observe the jobs are not submitted to Spark master. We do not see those jobs 
in Spark master web UI. But when we try some queries with reducer phase(in mr 
execution style), we see the job as "Hive on Spark" application in Spark master 
web UI. Appreciate if you could help us understand this behavior.   Am I 
missing something obvious here?

Thanks & Regards,
Prabu