5 ms·

What consistency model does FDB provide?

• evanweaver 8y ago
  In my understanding, it can provide strict serializability. The main difference from actual Percolator is that FoundationDB manages range locks through a logically separate pool of in-memory lock caches, instead of writing durable locks to the replicas, but the end result is the same. External consistency for read/write transactions within a single datacenter at a time.
  • wwilson 8y ago
    There is no correctness limitation on using FoundationDB in multiple datacenters, and if you do most of your writes in a single datacenter while using the others for disaster recovery, the latency is honestly pretty good too (especially with some of the new 6.0 features). EDIT: I was wondering why this conversation was giving me deja vu, and then I remembered that you and Dave discussed this in detail last month: https://news.ycombinator.com/item?id=18258805 https://news.ycombinator.com/item?id=18258805
    • evanweaver 8y ago
      I forgot about that; thanks for the link. I didn't intend to imply a correctness limitation.