yzhao244 commented on pull request #434:
URL: 
https://github.com/apache/incubator-eventmesh/pull/434#issuecomment-884370419


   > > @qqeasonchen @ruanwenjun Hi guys, do you have any concerns before 
merging this PR? Please let me know if I missed anything here. :)
   > 
   > @yzhao244 Hi, I have a question, the h2 is a memory database, it seems 
doesn't support distributed, how can the different eventmesh-runtime sync the 
schema change?
   
   very good question.. Actually, h2 can be turned into a persistent database 
by using the following example configuration 
(datasource.url=jdbc:h2:file:~/subdirectory/demodb) which persists data in file 
system. 
   Additionally,  database configuration/url can be easily changed to point to 
any MySQL database service as an example based on end-user's choice for 
different eventmesh-runtime instances to sync the schema change.  I am thinking 
to create separate issue for tracking documentation works for OpenSchema 
Integration and h2 plugin module. 
   
![image](https://user-images.githubusercontent.com/15642771/126534383-3cdcf93b-3594-4d24-b22a-9e31e8a0421e.png)
     


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