保持本地缓存的策略在分布式系统中看到相同的“版本”数据

I'm trying to build a distributed system to run some performance intensive calculations. One calculation can be done in parallel at multiple worker nodes. The problem is, as the data source keeps changing in real-time, we want each worker node (during a single calculation) to operate on the same "version" of data, i.e. a point-in-time snapshot of the database. This is to avoid inconsistent results.I'm trying to build a distributed system to run