default queue accepting one mr job for hive while tez accepting more than one. default execution engine is Tez. in this case default queue running 3 different query parallely in 3 different session. While i set hive.execution.engine=mr in this case i am able to open multiple hive session but default queue run only one query at a time. My cluster is big and already tried multiple small job parallely for Tez. but setting hive.execution.engine=mr run only one job at a time in default queue. ... View more