When the ZooKeeper leader node restarts or the ZooKeeper process freezes, the session expires. There is a possibility that the instance enters the shutdown state. As a result, the instance node scheduling stops. The instance node can be restored only by restarting the instance node.

[ExploreHeart]

https://github.com/apache/shardingsphere-elasticjob/blob/9fe902a36d54af51c59b4677b6b37cb03abb9a87/kernel/src/main/java/org/apache/shardingsphere/elasticjob/kernel/internal/instance/ShutdownListenerManager.java#L58