Spring boot scheduled cron jobs run 2 times when deployed more than one instance

Question

I have four cron jobs in the application and they work some hours in the day. I deployed them in 6 different instance and I use shedLock to prevent overlapping but it wasn't enough. Because sometimes job delay and lock is removed, then job work 2 times again. How can I configure that if a cron job still working in the one instance, other instances don't start job till this one finish?

Answer 1

为什么不使用distribute executor？如果你部署在多个instance上，你必须管理和调度instance的状态，例如instance A在t1运行，instance B在t2运行，非常复杂。你可以部署在instance上或者选择distribute调度执行器，在所有分布式系统中，状态管理非常困难

Answer 2

尝试一次部署一个 Spring Boot Scheduled Cron 作业，以防止它们被部署多个实例