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spark master election for multiregion

I have deployed DSE cassandra with spark cluster in multiple region (east and west) on ec2.
Each region has 2 nodes.
For my setup I have seed following observation

1.spark master is elected for both the region
2.spark workers from registering with himself with respective master in particular region

Is it the expected behaviour?

Please let me know if anyone have setup same design before.

due_lease has 1 replication factor for each region

Thank you.
Ashwini Mhatre
Software engineer 
Cisco systems