SimbaLeader election for the JVM

One node at a time runs the job — on the MySQL, Redis or Zookeeper you already operate.

Leader-only scheduling

Annotate a method with @SimbaScheduled, or use SimbaScheduler without Spring. Work starts when the node becomes leader and is interrupted when it loses leadership.

Leases you can reason about

Ownership is a time-bounded lease. Each node revokes its own ownership when the lease ends, even if the backend call hangs.

Fencing tokens

Every ownership term carries a strictly increasing token, so the resources you protect can reject a paused former leader.

Three backends, one contract

JDBC/MySQL, Redis and Zookeeper pass the same compatibility test kit. No Simba server to run.

Spring Boot starter

Auto-configuration for the backend on your classpath, a dedicated callback executor, and explicit simba.backend selection.

Observable

Micrometer metrics for leadership, contention and lease expiry, plus a read-only simba Actuator endpoint.