[GitHub] coolbeevip opened a new pull request #398: [SCB-1130] Fix single point failure of Alpha cluster when scanner enabled node shutdown

[GitBox <gi...@apache.org>]

coolbeevip opened a new pull request #398: [SCB-1130] Fix single point failure of Alpha cluster when scanner enabled node shutdown
URL: https://github.com/apache/servicecomb-pack/pull/398
 
 
   Dynamically configure the master node base on master_lock table
   
   Configure `alpha.cluster.master.enabled=true` to activate this feature
   
   ### Attention
   * mysql need configure `serverTimezone=GMT%2b8`
   * need configure NTP
   
   ### example
   Start two nodes
   You can see the `Master Node` or `Slave Node` in the log. When the Master Node shutdown, Slave Node change to the Master Node.
   
   ```
   java -jar alpha-server-0.4.0-SNAPSHOT-exec.jar \
     --server.port=0 \
     --alpha.server.port=8080 \
     --spring.datasource.url="jdbc:postgresql://127.0.0.1:5432/saga?useSSL=false" \
     --spring.datasource.username=saga-user \
     --spring.datasource.password=saga-password \
     --alpha.cluster.master.enabled=true
   ```
   
   ```
   java -jar alpha-server-0.4.0-SNAPSHOT-exec.jar \
     --server.port=0 \
     --alpha.server.port=8081 \
     --spring.datasource.url="jdbc:postgresql://127.0.0.1:5432/saga?useSSL=false" \
     --spring.datasource.username=saga-user \
     --spring.datasource.password=saga-password \
     --alpha.cluster.master.enabled=true
   ```

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