Everytime I run parallel job it always failed with this error: 

ConcurrentAppendException: Files were added to the root of the table by a concurrent update. Please try the operation again.

I did a lot of reseaches also create liquid clustering table and row level concurrency but it still failed.

Note: I can pass with retry method, but my boss doesn't like that approach. Does anyone can help me on this case?

Thanks you very much!

Please see detailt my table configuration in attachment picture.