What is the difference between a quartz cluster and a non-cluster?

There are differences between Quartz cluster and non-cluster modes.

1. Support for multiple nodes: Quartz cluster allows tasks to be deployed and executed on multiple nodes, where each node can independently schedule and execute tasks. Non-cluster mode only allows tasks to be scheduled and executed on a single node.
2. High availability: Due to tasks in the Quartz cluster being able to be executed on multiple nodes, even if one node fails, the other nodes can still continue executing tasks, thus providing high availability. In non-cluster mode, if a node fails, tasks will be unable to continue executing, potentially leading to task loss or delays.
3. Load Balancing: In a Quartz cluster, tasks can be distributed to different nodes using load balancing algorithms to balance the system’s workload. In non-cluster mode, all tasks are executed on a single node, which may result in that node being overloaded.
4. Database synchronization: In a Quartz cluster, shared databases are used to store task and scheduling information, with synchronization between multiple nodes achieved through the database’s locking mechanism. In non-clustered mode, task and scheduling information are only stored in the memory of a single node, making cross-node synchronization impossible.

In summary, Quartz cluster mode offers advantages such as multi-node support, high availability, load balancing, and database synchronization, making it suitable for large-scale job scheduling scenarios. On the other hand, non-cluster mode is more suitable for small-scale job scheduling and does not require multi-node support or high availability.