Problem: How to use MySQL as alpha's backend database?

Solution: To replace the default database from postgreSQL to MySQL:

  1. add dependency of mysql-connector-java in alpha/alpha-server/pom.xml

  2. install Saga

    mvn clean package -Pdocker -DskipTests

    After that, you will find the generated docker image alpha-server and executable file alpha/alpha-server/target/saga/alpha-server-${version}-exec.jar.

    Notice: If you do not want to build the docker image, run mvn clean package -DskipTests is enough.

    Notice: If you have installed saga with docker before, you need to remove the alpha-server's docker image first.

    docker rmi -f $(docker images | grep alpha-server | awk '{print $3}')
  3. run MySQL

    docker run -d -e "MYSQL_ROOT_PASSWORD=password" -e "MYSQL_DATABASE=saga" -e "MYSQL_USER=saga" -e "MYSQL_PASSWORD=password" -p 3306:3306 mysql/mysql-server:5.7
  4. Run alpha. Please make sure MySQL is up before this step. You can run alpha through docker or executable file.

    • via docker
      docker run -d -p 8080:8080 -p 8090:8090 -e " -Dspring.datasource.url=jdbc:mysql://${host_address}:3306/saga?useSSL=false" alpha-server:${saga_version}
    • via executable file
      java -D"spring.datasource.url=jdbc:mysql://${host_address}:3306/saga?useSSL=false" -jar alpha-server-${saga_version}-exec.jar

    Notice: Please change ${saga_version} and ${host_address} to the actual value before you execute the command.

    Note: By default, port 8080 is used to serve omega's request via gRPC while port 8090 is used to query the events stored in alpha.