如何记录复杂的同步过程？

I'm developing a complicated distributed service that makes iterative synchronization process. It synchronise every 10 seconds business entities in different information systems. One iteration is consist of bunch of 3d party service calls to retrieve current state of business objects (count of customers, goods, certain customer and goods details etc.), queries to local DB and then get differences between them and smooth out, synchronize this differences. I'm developing a complicated distributed servic