Database and app online tracing
The distributed tracing system is designed based on the Google Dapper paper. There are already many relatively mature applications of the system, such as Zipkin by Twitter, SkyWalking by Apache, and CAT by Meituan-Dianping.
The following sections will introduce you to how a database and app online tracing work, and then show you how Apache ShardingSphere implements this feature.
How it works
A distributed scheduling chain turns one distributed request into multiple scheduling chains. In the scheduling of one distributed request, such as time consumption on each node, the machine receives the request and the status of the request on each service node can be seen in the backend.
The following is a diagram of one distributed request scheduling chain quoted in Google's paper Dapper, A Large-Scale Distributed Systems Tracing Infrastructure:
Figure 4.8 – A distributed request scheduling chain
Citation
Dapper...
