How to increase map and reduce task number during #3 Step Name: Extract Fact Table Distinct Columns

[peter zhang]

Hi all,
I have a cube build very slowly, especially the step 3* Extract Fact Table
Distinct Columns*.
I checked job log at YARN, found the map and task number is small then
previous 2 steps. Could any one tell me how to determine the map and reduce
task number to increase job parallel.

Thanks!