Description of the illustration
This image is mostly described in the accompanying text. In addition:
-
There are two parallel execution server sets
-
Parallel execution server set 1 contacts parallel execution server set 2 based on the DOP
-
Parallel execution server set 2 contacts parallel execution server set 1 based on the DOP
-
Each server passes the buffer back and forth
-
Message buffers are attached to all parallel execution server sets