The unit of trust in a cell is allapplication servers overall nodes.
计算单元中的信任单位是所有节点上的所有应用服务器。
2
A particular unit might fail frequently, but the only consequence apparent at the application level is spooky variations in over-all performance.
特定的单元可能经常发生故障,但是在应用程序级别出现的唯一结果是在整体性能方面的各种怪异变化。
3
Migrating those applications to GAE might be costly, because you not only need to identify the issues and create workarounds, but also do quality assurance for the entire applicationallover again.