The application support layer heap represents a communication buffer between the local application and its associated agent.
应用程序支持层堆是本地应用程序和与它相关联的代理之间的通信缓冲区。
2
While the agents are busy doing steps 3 and 4 above, the union operator (run by the coordinator agent) starts reading data from the SHIP buffer on the first leg of the union.