Queries with materialized views are getting blocked

I am using EAP6.1+Teiid8.7. My application has a union query that has some materialized views in it. While this query is getting executed , it is getting blocked. Verified the behavior with teiid 8.9 CR1 as well, but the issue gets reproduced there as well. Attached the forum discussion details, that contains the log while problem has occured.