Spring boot app scale up with mysql - mysql

Question

I have created spring-boot app and database using mysql. Then I Dockerised And Deployed it. below show my docker-compse.yml
version: '2'
services:
seat_reservation_service:
image: springio/seat_reservation_service
ports:
- "8090:8090"
environment:
- SPRING_PROFILES_ACTIVE=docker
seat_reservation_sql:
image: mysql:5.7
ports:
- 33306:3306
environment:
- MYSQL_ROOT_PASSWORD=root
- MYSQL_DATABASE=seat-reservation-query
this is my spring application.yml file
server:
port: 8090
spring:
profiles: docker
main:
banner-mode: 'off'
datasource:
url: jdbc:mysql://seat_reservation_sql:3306/seat-reservation-query?useSSL=false
username: root
password: root
validation-query: SELECT 1
test-on-borrow: true
jpa:
show_sql: false
hibernate:
ddl-auto: update
dialect: org.hibernate.dialect.MySQL5
properties:
hibernate:
cache:
use_second_level_cache: false
use_query_cache: false
generate_statistics: false
data:
rest:
base-path: /api/
rabbitmq:
host: rabbitmq-1
username: test
password: password
logging:
level:
org.springframework: false
org.hibernate: ERROR
path: logs/prod/
axon:
amqp:
exchange: SeatReserveEvents
eventhandling:
processors:
statistics.source: statisticsQueue
My problem is I need more replicas form seat_reservation_service service. If I scale up seat_reservation_service that refer same database. According to micro-service architecture I need separate database for each replica. How can I do that?
if I use in memory database it can do

Answer 1

According to micro-service architecture I need separate database for each replica. How can I do that?
This "rule" refers to the microservice types, not to the instances of the same microservice. So, you can scale separately the seat_reservation_service and seat_reservation_sql. For example, you could have 4 instances of seat_reservation_service and 3 instances of seat_reservation_sql (1 master and 2 slaves or a Galera cluster).