esper ha模式对比

esper ha模式对比

	**Selective State Residence **	**Capture **
Engine State 引擎状态	Engine state is not limited to the amount of heap memory and can be much larger than available heap memory. 内存状态不受堆内存限制，可以大于堆内存	All engine state must fit into heap memory. Therefore engine state is limited to the amount of heap memory available.
Memory management 内存管理	Comprehensive; Memory resources can be actively managed and engine state can be released from memory. 综合，状态可以从内存中释放	None; all engine state must be in memory for operation. 状态必须都在内存中
Incremental checkpoint 增量checkpoint	Yes, checkpoints are always implicitly incremental. 只能增量checkpoint	Yes, checkpoints can also full backup. 支持增量checkpoint & 全量checkpoint
Checkpoint pause-time checkpoint暂停时间	Minimized 最小	Pause-time spans the whole checkpoint. 整个checkpoint周期内全暂停
Store Targets 存储目标	Multiple 文件 数据库 redis	File System 文件
Recovery State Reading 状态恢复	Reads only engine metadata. The engine state is still available and the engine reads such state at the time of state use. 只加载引擎元数据，引擎状态等到使用时再加载	Reads all engine state into memory. 加载所有状态
Resilience service level configurable per statement 持久化级别配置粒度	No; All statements participate. 全局配置	Yes; Profiles can declare EPL statements to be transient, durable or resilient. statements 粒度
State management API to extract and load state 通过API导出、加载状态	Not available 不支持	Available 支持

esperha 自动checkpoint设置

• 示例配置

• tips：
  • enabled设置成false，用于手动checkpoint

esperha ssr-持久化到fs

        
            
                
            
            
                
                ./checkpoint