ascrutae commented on issue #855: Begin SkyWalking 5.0.0-alpha e2e integration 
test.
URL: 
https://github.com/apache/incubator-skywalking/issues/855#issuecomment-369851626
 
 
   The process of test case as following: portal service receive key from http 
request, and it call the cache query service and query the key on the mysql 
service. finally update the cache by the new key. BTW, there are three layer on 
cache service: Redis, embed h2 database and mongo DB. The call graph as 
following:
   
   <img width="577" alt="wx20170412-163927 2x" 
src="https://cloud.githubusercontent.com/assets/12436447/24948960/a00c9e90-1f9e-11e7-9ac1-b304a8301f0f.png";>
   
   Portal Server: Entry of test case. Portal Server run in tomcat container.
   
   Cache Server: Cache service provide query and update cache. and it run in 
motan. 
   **NOTE:** It will start H2 database when the server start
   
   Persistence Server: Persistence service provide query data from mysql, and 
it initial data when persistence service start. it run in Dubbo with rest 
protocol.
   
   
   

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